Merge remote-tracking branch 'origin/main' into feat/247-foreign-workflows-pr2

# Conflicts: # TESTING.md
2026-10-28 15:34:09 -07:00
parent f318ff2f9b 56d0a4904c
commit 432dd219ab
92 changed files with 6632 additions and 429 deletions
@@ -0,0 +1,314 @@
+/**
+ * Collections (#331): named, hand-picked groups of images, persisted through `/prompt_manager/collections*`.
+ *
+ * - D136: the sidebar COLLECTIONS group (the concept's `#collections-nav`, index.html 28–31, app.js 336–339) lists
+ *   each collection as `#/collection/<id>` with its listed-member count, without the concept's "PROPOSED" badge.
+ * - D137: a collection page is Images filtered to the collection; its Edit renames or deletes it through the saved
+ *   views' Edit dialog (D51) with collection nouns.
+ * - This module holds the client store (`createCollections`), the route hash, the name rule and every user-facing
+ *   string of the design (§7.4, §8), so the selection bar, the inspector and the shell say the same things.
+ */
+import { noun } from './plural.mjs';
+import { openEditDialog } from './saved-views.mjs';
+
+export const COLLECTIONS_URL = '/prompt_manager/collections';
+export const COLLECTION_ITEMS_URL = `${COLLECTIONS_URL}/items`;
+export const COLLECTION_MEMBERSHIP_URL = `${COLLECTIONS_URL}/membership`;
+export const MAX_COLLECTION_NAME_LENGTH = 100;
+// The routes' cap on one add or remove (the bulk tagging cap, MAX_BULK_IMAGES).
+export const MAX_COLLECTION_ITEMS = 500;
+// Counts are re-read once after a run of confirmed changes settles, as the Favorites count (#249 M1).
+export const COLLECTION_COUNT_DELAY_MS = 300;
+
+// Strings (design §7.4 and §8).
+export const ADD_DIALOG_TITLE = 'Add selected images to collection';
+export const ADD_DIALOG_LABEL = 'Collection name';
+export const ADD_DIALOG_ACTION = 'Add';
+export const TOO_MANY_TOAST = `Select at most ${MAX_COLLECTION_ITEMS} images.`;
+export const FILES_NOT_FOUND_TOAST = 'None of the selected images could be found. Refresh the images and try again.';
+export const SOURCE_CHANGED_TOAST = 'The sources changed. Refresh the images and try again.';
+export const ADD_FAILED_TOAST = 'The images could not be added. Try again.';
+export const REMOVE_FAILED_TOAST = 'The images could not be removed. Try again.';
+export const COLLECTION_GONE_TOAST = 'That collection no longer exists.';
+export const RENAMED_TOAST = 'Collection renamed.';
+export const RENAME_FAILED_TOAST = 'The collection could not be renamed. Try again.';
+export const DELETED_TOAST = 'Collection deleted.';
+export const DELETE_FAILED_TOAST = 'The collection could not be deleted. Try again.';
+export const DELETED_PAGE_TEXT = 'This collection no longer exists.';
+export const OPEN_IMAGES_LINK = 'Open Images';
+export const VIEW_COLLECTION_DELETED = 'The collection this view uses was deleted.';
+export const LIST_FAILED_TEXT = 'Collections could not be loaded. Your saved data has not changed.';
+export const COLLECTIONS_UPDATED_TOAST = 'Collections updated.';
+export const UPDATE_FAILED_TEXT = 'The collections could not be updated. Try again.';
+export const MEMBERSHIP_LOADING_TEXT = 'Loading collections…';
+export const MEMBERSHIP_FAILED_TEXT = 'Collections could not be loaded.';
+export const NO_COLLECTIONS_TEXT = 'No collections yet. Name one below.';
+
+const CONTROL = /[\u0000-\u001f\u007f]/;
+const isCount = value => Number.isSafeInteger(value) && value >= 0;
+const isId = value => Number.isSafeInteger(value) && value >= 1 && value <= 999_999_999;
+
+/** The route of one collection. */
+export function collectionHash(id) {
+    if (!isId(id)) throw new TypeError('Invalid collection id');
+    return `#/collection/${id}`;
+}
+
+/**
+ * A name as the database stores it (design §1): trimmed, each run of whitespace one space, 1 to 100 characters
+ * without control characters; null otherwise. Tabs and newlines are whitespace, so they collapse.
+ */
+export function normalizeCollectionName(value) {
+    if (typeof value !== 'string') return null;
+    const name = value.trim().replace(/\s+/g, ' ');
+    return name.length >= 1 && name.length <= MAX_COLLECTION_NAME_LENGTH && !CONTROL.test(name) ? name : null;
+}
+
+/** One listed collection, or null when the row is not usable. `count` and `missing` are null unless counts. */
+export function parseCollection(row) {
+    if (!isId(row?.id) || typeof row.name !== 'string' || !row.name.trim()) return null;
+    const counted = isCount(row.count) && isCount(row.missing);
+    return { id: row.id, name: row.name, count: counted ? row.count : null, missing: counted ? row.missing : null };
+}
+
+/** The listing's collections in the server's order (name, then id), skipping unusable rows. */
+export function parseCollections(data) {
+    if (!Array.isArray(data?.collections)) throw new TypeError('Invalid collections');
+    return data.collections.map(parseCollection).filter(Boolean);
+}
+
+/** The sidebar's order while a re-read is pending: an approximation of the server's name key, then id. */
+const nameKey = name => name.normalize('NFC').toLowerCase().normalize('NFC');
+const ordered = list => [...list].sort((a, b) => {
+    const left = nameKey(a.name), right = nameKey(b.name);
+    return left < right ? -1 : left > right ? 1 : a.id - b.id;
+});
+
+/** "Added N images to “X”." with what was already in it and what could not be found. */
+export function addedMessage({ collection, added, already, notFound }) {
+    if (added === 0 && notFound === 0) return `All selected images were already in “${collection.name}”.`;
+    let text = `Added ${added} ${noun(added, 'image')} to “${collection.name}”.`;
+    if (already > 0) text += already === 1 ? ' 1 was already in it.' : ` ${already} were already in it.`;
+    if (notFound > 0) text += ` ${notFound} could not be found.`;
+    return text;
+}
+
+export function removedMessage(name, removed) {
+    return `Removed ${removed} ${noun(removed, 'image')} from “${name}”.`;
+}
+
+export function nameTakenMessage(name) {
+    return `A collection named “${name}” already exists.`;
+}
+
+/** The Delete confirmation, with the stored count (listed plus missing) when the counts are known. */
+export function deleteQuestion({ name, count, missing }) {
+    if (!isCount(count) || !isCount(missing)) {
+        return `Delete “${name}”? Its images stay where they are; only the collection is removed.`;
+    }
+    const stored = count + missing;
+    return stored === 1
+        ? `Delete “${name}”? Its 1 image stays where it is; only the collection is removed.`
+        : `Delete “${name}”? Its ${stored} images stay where they are; only the collection is removed.`;
+}
+
+/** The collection page's note about members its sources do not list now (MC3); empty when there are none. */
+export function missingNote(missing) {
+    if (!isCount(missing) || missing === 0) return '';
+    return missing === 1
+        ? '1 image in this collection is not in your current sources.'
+        : `${missing} images in this collection are not in your current sources.`;
+}
+
+export const isCollectionGone = error => error?.code === 'collection-not-found';
+
+/** A failed add or remove's toast: the routes' error codes, else `fallback`. */
+export function writeFailure(error, fallback) {
+    if (isCollectionGone(error)) return COLLECTION_GONE_TOAST;
+    if (error?.code === 'source-changed') return SOURCE_CHANGED_TOAST;
+    if (error?.code === 'files-not-found') return FILES_NOT_FOUND_TOAST;
+    return fallback;
+}
+
+/** The Edit dialog's mapping of a failed rename of `name` (openEditDialog `renameError`). */
+export function renameFailure(name) {
+    return error => {
+        if (error?.code === 'name-taken') return { field: nameTakenMessage(name) };
+        if (isCollectionGone(error)) return { toast: COLLECTION_GONE_TOAST, close: true };
+        return { toast: RENAME_FAILED_TOAST };
+    };
+}
+
+/** The collection nouns of the shared Edit dialog (D51, D137). */
+export const COLLECTION_NOUNS = Object.freeze({
+    title: 'Edit collection', label: 'Collection name', deleteTitle: 'Delete collection', deleteText: deleteQuestion,
+    renamed: RENAMED_TOAST, renameFailed: RENAME_FAILED_TOAST, deleted: DELETED_TOAST, deleteFailed: DELETE_FAILED_TOAST,
+});
+
+/**
+ * D137: the open collection's Edit. A taken name stays in the dialog under the field; a failed rename keeps it open;
+ * a collection deleted meanwhile closes it and runs `onGone()` after the toast. `onRename(name)` sends the normalized
+ * name; a delete's 404 counts as deleted (the store's `delete`).
+ */
+export function openEditCollectionDialog({ scope, trigger, collection, onRename, onDelete, onGone = () => {} }) {
+    let attempted = '';
+    const mapping = error => {
+        const outcome = renameFailure(attempted)(error);
+        if (outcome.close) queueMicrotask(onGone);
+        return outcome;
+    };
+    openEditDialog({ scope, trigger, item: collection, nouns: COLLECTION_NOUNS, onDelete, renameError: mapping,
+        onRename: name => {
+            attempted = normalizeCollectionName(name) ?? name;
+            return onRename(attempted);
+        } });
+}
+
+function fileTargets(items) {
+    if (!Array.isArray(items) || items.length < 1 || items.length > MAX_COLLECTION_ITEMS) {
+        throw new TypeError('A collection change needs 1 to 500 files');
+    }
+    return items.map(item => {
+        if (!Number.isSafeInteger(item?.root_index) || item.root_index < 0 || typeof item.root_scope !== 'string' ||
+            !item.root_scope || typeof item.path !== 'string' || !item.path) {
+            throw new TypeError('Invalid collection file');
+        }
+        return { root_index: item.root_index, root_scope: item.root_scope, path: item.path };
+    });
+}
+
+function requireId(id) {
+    if (!isId(id)) throw new TypeError('Invalid collection id');
+    return id;
+}
+
+function requireName(name) {
+    const normalized = normalizeCollectionName(name);
+    if (normalized === null) throw new TypeError('Invalid collection name');
+    return normalized;
+}
+
+/** The `{id, name}` a write answered with. */
+function answered(data) {
+    const collection = parseCollection(data?.collection);
+    if (!collection) throw new TypeError('Invalid collection');
+    return { id: collection.id, name: collection.name };
+}
+
+function countOf(value) {
+    if (!isCount(value)) throw new TypeError('Invalid collection count');
+    return value;
+}
+
+/**
+ * The shell's collection list. `load()` re-reads it (a newer read supersedes an older one), `subscribe(fn)` reports
+ * `{collections, status}` on every change, `settled()` resolves once no read is in flight; `status` is 'loading',
+ * 'ready' or 'error' and a failed read keeps the last list. `add`, `remove`, `rename` and `delete` change the listed
+ * rows at once and re-read the counts once, 300 ms after the last confirmed change; a write to a collection that is
+ * gone (404 `collection-not-found`) re-reads the list at once and rejects. `timers` is a test seam.
+ */
+export function createCollections(api, signal, { setTimer = setTimeout, clearTimer = clearTimeout } = {}) {
+    let collections = [], status = 'loading', request = null, timer = 0;
+    const listeners = new Set();
+    let waiting = [];
+    const emit = () => {
+        const snapshot = { collections, status };
+        for (const listener of listeners) listener(snapshot);
+        if (status !== 'loading') { const done = waiting; waiting = []; for (const resolve of done) resolve(snapshot); }
+    };
+    const stopTimer = () => { if (timer) clearTimer(timer); timer = 0; };
+    signal?.addEventListener('abort', () => { stopTimer(); request?.abort(); }, { once: true });
+    function load() {
+        if (signal?.aborted) return Promise.resolve();
+        request?.abort();
+        const controller = new AbortController();
+        request = controller;
+        status = 'loading';
+        emit();
+        return api.get(COLLECTIONS_URL, { signal: controller.signal, cache: 'no-store' }).then(data => {
+            if (request !== controller) return;
+            collections = parseCollections(data);
+            status = 'ready';
+        }).catch(() => {
+            if (request !== controller) return;
+            status = 'error';
+        }).finally(() => {
+            if (request !== controller || signal?.aborted) return;
+            request = null;
+            emit();
+        });
+    }
+    function changed(next) {
+        collections = ordered(next);
+        emit();
+        stopTimer();
+        timer = setTimer(() => { timer = 0; load(); }, COLLECTION_COUNT_DELAY_MS);
+    }
+    /** Send one write; a collection found gone meanwhile re-reads the list before the error reaches the caller. */
+    async function send(write) {
+        try {
+            return await write();
+        } catch (error) {
+            if (isCollectionGone(error)) load();
+            throw error;
+        }
+    }
+    async function add(target, items) {
+        const byId = target?.collectionId !== undefined, byName = target?.name !== undefined;
+        if (byId === byName) throw new TypeError('A collection is named by its id or a name');
+        const body = byId ? { collection_id: requireId(target.collectionId) } : { name: requireName(target.name) };
+        body.items = fileTargets(items);
+        const data = await send(() => api.post(COLLECTION_ITEMS_URL, body, { signal }));
+        const result = { collection: answered(data), created: data.created === true, added: countOf(data.added),
+            already: countOf(data.already), notFound: countOf(data.not_found) };
+        const { id, name } = result.collection;
+        changed(collections.some(item => item.id === id)
+            ? collections.map(item => item.id === id ? { ...item, name } : item)
+            : [...collections, { id, name, count: null, missing: null }]);
+        return result;
+    }
+    async function remove(id, items) {
+        const body = { collection_id: requireId(id), items: fileTargets(items) };
+        const data = await send(() => api.del(COLLECTION_ITEMS_URL, { signal, body }));
+        const result = { collection: answered(data), removed: countOf(data.removed) };
+        changed(collections);
+        return result;
+    }
+    async function membership(identity) {
+        const [file] = fileTargets([identity]);
+        const query = new URLSearchParams({ root_index: String(file.root_index), root_scope: file.root_scope, path: file.path });
+        const data = await api.get(`${COLLECTION_MEMBERSHIP_URL}?${query}`, { signal, cache: 'no-store' });
+        const ids = data?.collection_ids;
+        if (!Array.isArray(ids) || !ids.every(isId)) throw new TypeError('Invalid collection membership');
+        return [...ids];
+    }
+    async function rename(id, name) {
+        const url = `${COLLECTIONS_URL}/${requireId(id)}`;
+        const body = { name: requireName(name) };
+        const renamed = answered(await send(() => api.patch(url, body, { signal })));
+        changed(collections.map(item => item.id === renamed.id ? { ...item, name: renamed.name } : item));
+        return renamed;
+    }
+    async function deleteCollection(id) {
+        const url = `${COLLECTIONS_URL}/${requireId(id)}`;
+        try {
+            await api.del(url, { signal });
+        } catch (error) {
+            // Already gone (another tab deleted it): the outcome the user asked for.
+            if (error?.status !== 404) throw error;
+        }
+        changed(collections.filter(item => item.id !== id));
+        return id;
+    }
+    return {
+        load, add, remove, membership, rename, delete: deleteCollection,
+        get collections() { return collections; },
+        get status() { return status; },
+        find: id => collections.find(item => item.id === id) ?? null,
+        settled: () => status === 'loading' ? new Promise(resolve => waiting.push(resolve)) : Promise.resolve({ collections, status }),
+        subscribe(listener) {
+            listeners.add(listener);
+            return () => listeners.delete(listener);
+        },
+    };
+}
@@ -20,8 +20,9 @@ const REPRESENTATIONS = {
    limited: 'Record exceeds inspection limits; text is unavailable',
 };
 const TEXTLESS = new Set(['invalid', 'limited']);
-// #332: the hidden prefix that names where a category chip's value came from.
+// #332: the hidden prefix and the visible origin word that name where a category chip's value came from (D146).
 const CATEGORY_PREFIX = {image: 'Image category: ', positive: 'Positive prompt category: ', pair: 'Recipe category: '};
+const CATEGORY_ORIGIN = {image: 'this image', positive: 'prompt', pair: 'recipe'};
 const REVEAL_URL = '/prompt_manager/images/reveal';
 // D38 Show in folder: the route's answers, in the maintainer's words.
 const REVEAL_OPENED = 'Opened the folder on this computer.';
@@ -193,6 +194,17 @@ export function inspectorTagChips(record, {filterable}) {
    return chips;
 }
 /** A concept chip whose visible text carries a visually hidden prefix naming what it is. */
+/**
+ * The category chip (#332 D146): the hidden prefix, the category, then `span.chip-source` " · this image", " · prompt"
+ * or " · recipe" (visible, never split), so the chip names where its value came from.
+ */
+export function categoryChip(library) {
+    const scope = CATEGORY_ORIGIN[library.category_scope] ? library.category_scope : 'positive';
+    const chip = prefixedChip(CATEGORY_PREFIX[scope], library.category);
+    chip.append(el('span', ` · ${CATEGORY_ORIGIN[scope]}`, 'chip-source'));
+    return chip;
+}
+
 function prefixedChip(prefix, text) {
    const chip = el('span', undefined, 'chip');
    chip.append(el('span', prefix, 'ca-visually-hidden'), text);
@@ -268,9 +280,7 @@ export function mountFileInspector(container, {api, sender, parentScope, variant
        const badges = el('div', undefined, 'tags'), badge = evidenceBadge(record.prompts);
        if (badge) badges.append(el('span', badge, 'chip blue'));
        // #332: an image's own category shows for any link status; an inherited one only when linked.
-        if (library?.category && (library.category_scope === 'image' || linked)) {
-            badges.append(prefixedChip(CATEGORY_PREFIX[library.category_scope] ?? CATEGORY_PREFIX.positive, library.category));
-        }
+        if (library?.category && (library.category_scope === 'image' || linked)) badges.append(categoryChip(library));
        if (badges.childNodes.length) inner.append(badges);
        const prompts = el('div'); inner.append(prompts);
        const blocks = mountPromptBlocks(prompts, {sender, parentScope:contentScope, includePairAction:false, contextLabel:promptContext, title});
@@ -203,17 +203,48 @@ async function readDefaults(api, signal) {
 }

 export const UNAVAILABLE_HINT = 'Download it in System › Auto-tagging.';
+const nonEmpty = value => typeof value === 'string' && value.trim() !== '';
+const joined = names => (names.length > 1 ? `${names.slice(0, -1).join(', ')} and ${names.at(-1)}` : names.join(''));
+
+/** The pip names a `/autotag/models` entry says its backend cannot import (#424); only non-empty strings count. */
+export const missingPackages = entry => (object(entry) && Array.isArray(entry.missing_packages)
+    ? entry.missing_packages.filter(nonEmpty) : []);
+
+/** `pip install …` for `entry`'s missing packages: the server's command, else built from the names; '' when none. */
+export function installCommand(entry) {
+    const missing = missingPackages(entry);
+    if (!missing.length) return '';
+    return nonEmpty(entry.install_command) ? entry.install_command : `pip install ${missing.join(' ')}`;
+}
+
+/**
+ * The server's missing-package sentence (`missing_packages_message`, #424) for `name`, else '' (nothing missing):
+ * "<name> needs llama-cpp-python. Install it into ComfyUI's Python: pip install llama-cpp-python. <note>".
+ */
+export function needsPackages(name, entry) {
+    const missing = missingPackages(entry);
+    if (!missing.length) return '';
+    const note = nonEmpty(entry.install_note) ? ` ${entry.install_note}` : '';
+    return `${name} needs ${joined(missing)}. Install ${missing.length === 1 ? 'it' : 'them'} into ComfyUI's Python: `
+        + `${installCommand(entry)}.${note}`;
+}
+
+/** "a, b and c": the missing package names as the sentences list them. */
+export const packageList = entry => joined(missingPackages(entry));
+
 /**
 * Why `model` cannot run, from the `/autotag/models` status (the server's own `model-unavailable` sentence), else ''
- * (downloaded, or the status is unknown: the job then reports a missing model itself).
+ * (ready, or the status is unknown: the job then reports a missing model itself). Not downloaded is named first, then
+ * a backend package that cannot be imported (#424).
 */
 export function modelUnavailable(models, model) {
    const option = modelOf(model);
    requireValue(option, 'Unknown tagging model');
    const status = object(models) && object(models[model]) ? models[model] : null;
-    if (!status || status.downloaded !== false) return '';
-    const name = typeof status.name === 'string' && status.name.trim() ? status.name : option.label.split(' · ')[0];
-    return `${name} is not downloaded. ${UNAVAILABLE_HINT}`;
+    if (!status) return '';
+    const fallback = option.label.split(' · ')[0];
+    if (status.downloaded === false) return `${nonEmpty(status.name) ? status.name : fallback} is not downloaded. ${UNAVAILABLE_HINT}`;
+    return needsPackages(nonEmpty(status.label) ? status.label : fallback.replace(' (Recommended)', ''), status);
 }

 function initialState(source, preset) {
@@ -1,42 +1,62 @@
-import { countOf, noun } from './plural.mjs';
+import { countOf } from './plural.mjs';

 /**
- * The Images selection bar's "Set category" (#249 D8). Images have no category of their own: the listing's category
- * filter matches the linked positive prompt's, so the action sets the category on those prompts.
+ * The Images selection bar's "Set category" (#332, D140; the concept's bulk-category → simpleInput). Apply sets each
+ * selected image's own category (`PUT /prompt_manager/images/category`); "Use prompt category" removes it after a
+ * confirmation (`DELETE`), so the image shows its prompt's category again. It never writes a prompt: prompt
+ * categories are set in the Prompt library editor and on the legacy admin page's "Set Category".
 */
+export const CATEGORY_URL = '/prompt_manager/images/category';
+export const IMAGE_CATEGORIES_URL = '/prompt_manager/images/categories';
 export const CATEGORY_DIALOG = Object.freeze({title:'Categorize selected images', label:'Category', action:'Apply'});
-export const CATEGORY_NONE_LINKED = "None of the selected images is linked to a saved prompt, so there is no prompt category to set.";
+export const USE_PROMPT_CATEGORY = 'Use prompt category';
+export const REMOVE_DIALOG = Object.freeze({title:'Use prompt category', action:'Remove'});
 export const CATEGORY_FAILED = 'Category could not be set. Try again.';
+export const NONE_FOUND = 'None of the selected images could be found. Refresh the images and try again.';
+export const NONE_HAD_OWN = 'None of the selected images had its own category.';
+export const SOURCES_CHANGED = 'The sources changed. Refresh the images and try again.';
 // The server's limit (`validate_category`): the field stops there instead of failing on Apply.
 export const CATEGORY_MAX_LENGTH = 100;
+// One request names at most 500 images (DC2), as "Add tags" does.
+export const MAX_CATEGORY_IMAGES = 500;

-function linkedPositive(image) {
-    const link = image?.linked;
-    if (link?.status !== 'linked') return null;
-    return Number.isSafeInteger(link.positive_id) && link.positive_id > 0 ? link.positive_id : null;
+/** The success toast of a set: unchanged files count as set; files no source lists are named after. */
+export function setOutcome(result, category) {
+    const updated = Number(result?.updated) || 0, unchanged = Number(result?.unchanged) || 0;
+    const missing = Number(result?.not_found) || 0;
+    const done = `Category “${category}” set on ${countOf(updated + unchanged, 'image')}.`;
+    return missing ? `${done} ${missing.toLocaleString()} could not be found.` : done;
 }

-/** The distinct linked positives of `images`, first-seen order; `skipped` counts the images without one. */
-export function categoryTargets(images) {
-    const ids = new Set();
-    let skipped = 0;
-    for (const image of images) {
-        const id = linkedPositive(image);
-        if (id === null) skipped += 1;
-        else ids.add(id);
+/** The toast of a removal. */
+export function clearOutcome(result) {
+    const cleared = Number(result?.cleared) || 0;
+    return cleared ? `Removed the image category from ${countOf(cleared, 'image')}.` : NONE_HAD_OWN;
+}
+
+/** The confirmation sentence before "Use prompt category" removes the own category of `count` images. */
+export function removeQuestion(count) {
+    const which = count === 1 ? 'the 1 selected image' : `the ${count.toLocaleString()} selected images`;
+    return `Remove the image category from ${which}? Each one then shows its prompt's category, or none if it has no ` +
+        'linked prompt. This cannot be undone.';
+}
+
+/** The toast for a failed write: the coded answers the routes give, else the fixed failure. */
+export function failureMessage(error) {
+    if (error?.code === 'files-not-found') return NONE_FOUND;
+    if (error?.code === 'source-changed') return SOURCES_CHANGED;
+    if (error?.code === 'too-many-images' && typeof error.message === 'string' && error.message) return error.message;
+    return CATEGORY_FAILED;
+}
+
+/** The toolbar's category list: the prompt and recipe categories plus the listed images' own ones, each once. */
+export function mergeCategories(promptCategories, imageCategories) {
+    const merged = [];
+    const seen = new Set();
+    for (const value of [...(promptCategories ?? []), ...(imageCategories ?? [])]) {
+        if (typeof value !== 'string' || !value.trim() || seen.has(value)) continue;
+        seen.add(value);
+        merged.push(value);
    }
-    return {promptIds:[...ids], skipped};
-}
-
-/** The success toast: the prompts changed, then any selected images that had no linked prompt. */
-export function categoryOutcome(prompts, skipped) {
-    const done = `Category set on ${countOf(prompts, 'prompt')}.`;
-    if (!skipped) return done;
-    return `${done} ${countOf(skipped, 'selected image')} had no linked prompt and ${noun(skipped, 'was', 'were')} skipped.`;
-}
-
-/** The prompts the server reports changed; without a count, the number of prompts posted. */
-export function updatedCount(result, posted) {
-    const count = result?.updated_count;
-    return Number.isSafeInteger(count) && count >= 0 ? count : posted;
+    return merged;
 }
@@ -2,16 +2,16 @@ import { createButton } from '../shared/toolkit/core.js';
 import { imageKey, toggleSelection, selectionLabel } from './images-state.mjs';
 import { inspectPath, toInspectionRecord } from './inspection-state.mjs';
 import { BUNDLE_FILENAME, metadataBundle, collectImagesMetadata, exportOutcome } from './images-export.mjs';
-import { CATEGORY_DIALOG, CATEGORY_FAILED, CATEGORY_MAX_LENGTH, CATEGORY_NONE_LINKED, categoryOutcome, categoryTargets, updatedCount } from './images-category.mjs';
-import { openInputDialog } from './workspace-dialogs.mjs';
-import { MAX_FILTER_IMAGES, TOO_MANY_MATCHING, openAddTags, openAutoTag } from './images-tagging-bulk.mjs';
+import { CATEGORY_DIALOG, CATEGORY_MAX_LENGTH, CATEGORY_URL, MAX_CATEGORY_IMAGES, REMOVE_DIALOG, USE_PROMPT_CATEGORY,
+    NONE_FOUND, clearOutcome, failureMessage, removeQuestion, setOutcome } from './images-category.mjs';
+import { closeWorkspaceDialog, openContentDialog, openInputDialog } from './workspace-dialogs.mjs';
+import { TOO_MANY, bulkTargets, openAddTags, openAutoTag } from './images-tagging-bulk.mjs';
 import { showWorkspaceToast } from './toast.mjs';
 import { applyKeys, createLongPress, matchingLabel, matchingOffer, offersAllMatching, rangeKeys } from './images-multiselect.mjs';

 const CHECKBOX = '.image-overlays input[type="checkbox"]';
 const CHECKBOX_LABEL = '.image-overlays > label';
 const CARD = 'article[data-image-key]';
-const CATEGORY_URL = '/prompt_manager/bulk/category';
 // D135: Export metadata reads every image's inspection in the browser, so it waits for loaded images.
 export const EXPORT_LOADED_ONLY = 'Export metadata reads each image in the browser, so it works on loaded images only.';

@@ -29,8 +29,9 @@ function el(tag, text, className) {
 * checkbox from `isChecked`; this module follows the boxes through the grid's `change` events.
 *
 * - `getItems()` is the listing in its order; `checked` restores a saved visit's selection.
- * - `onCategorySet()` reloads the categories and the listing after a successful Set category (the reload clears the
- *   selection through `clear`); focus then moves to `focusFallback` if it was on the hidden action.
+ * - `onCategorySet()` reloads the categories and the listing after a successful Set category or Use prompt category
+ *   (the reload clears the selection through `clear`); focus then moves to `focusFallback` if it was on the hidden
+ *   action. `getCategories()` gives the toolbar's categories, the field's suggestions.
 * - `retain(kept)` drops the checked files a refreshed listing no longer holds (a tag save under a filter, I7).
 * - With the Activity store `activity`, Add tags and Auto-tag selected (D85) follow the count, as the concept's Add tags
 *   leads its actions; `onTagged(keys)` re-reads the files a finished tagging job tagged. The selection stays.
@@ -43,7 +44,7 @@ function el(tag, text, className) {
 * matching", whose actions send that filter to the server.
 */
 export function mountSelectionBar({ scope, api, grid, getItems, focusFallback, onCategorySet, activity = null, onTagged,
-    getListing, getFilter, checked: initial = Object.freeze(new Set()) }) {
+    getListing, getFilter, getCategories, checked: initial = Object.freeze(new Set()) }) {
    let checked = initial;
    let exporting = false, categorizing = false;
    // D135: the range anchor, "all N matching" mode, touch selection mode and a pending Shift+click on a checkbox.
@@ -261,42 +262,65 @@ export function mountSelectionBar({ scope, api, grid, getItems, focusFallback, o
        timer = setTimeout(release, 1000);
    }
    /**
-     * Set category (app.js bulk-category → simpleInput): images have no category, so Apply sets it on the selection's
-     * distinct linked positives, taken when the (modal) dialog opens. With no linked image there is nothing to change:
-     * a toast says so and no dialog opens.
+     * Set category (app.js bulk-category → simpleInput, #332 D140): Apply sets each selected image's own category, linked
+     * or not; "Use prompt category" removes it after a confirmation that states the count. Up to 500 images (DC2): an
+     * explicit selection or "all N matching" (the listing filter, resolved by the server); more opens nothing.
     */
    function openCategory(button) {
        if (categorizing) return;
-        // All matching (D135): the listing's positive count says whether any match is linked; the server resolves.
-        if (allMatching && getListing().total > MAX_FILTER_IMAGES) { showWorkspaceToast(TOO_MANY_MATCHING); return; }
-        const targets = allMatching ? {filter: getFilter()} : categoryTargets(checkedImages());
-        const linked = allMatching ? getListing().positiveCount !== 0 : targets.promptIds.length > 0;
-        if (!linked) { showWorkspaceToast(CATEGORY_NONE_LINKED); return; }
+        const count = allMatching ? getListing().total : checked.size;
+        const targets = allMatching ? {filter: getFilter()} : {items: bulkTargets(checkedImages())};
+        if (count > MAX_CATEGORY_IMAGES) { showWorkspaceToast(TOO_MANY); return; }
+        // Checked files the listing no longer holds (a refresh dropped them): nothing to send.
+        if (!allMatching && !targets.items?.length) { showWorkspaceToast(NONE_FOUND); return; }
        openInputDialog({ scope, trigger: button, title: CATEGORY_DIALOG.title, label: CATEGORY_DIALOG.label,
-            action: CATEGORY_DIALOG.action, maxLength: CATEGORY_MAX_LENGTH, onApply: category => applyCategory(button, targets, category) });
+            action: CATEGORY_DIALOG.action, maxLength: CATEGORY_MAX_LENGTH, suggestions: getCategories(),
+            secondary: { label: USE_PROMPT_CATEGORY, onClick: () => confirmRemove(button, targets, count) },
+            onApply: category => writeCategory(button, () => api.put(CATEGORY_URL, {...targets, category}),
+                result => setOutcome(result, category)) });
+    }
+    /** "Use prompt category": nothing is sent until Remove; Cancel leaves every category as it was. */
+    function confirmRemove(button, targets, count) {
+        const text = el('p', removeQuestion(count));
+        const actions = el('div', undefined, 'dialog-actions');
+        const cancel = createButton('Cancel'), remove = createButton(REMOVE_DIALOG.action, 'danger');
+        actions.append(cancel, remove);
+        cancel.addEventListener('click', () => closeWorkspaceDialog());
+        remove.addEventListener('click', () => {
+            closeWorkspaceDialog();
+            writeCategory(button, () => api.del(CATEGORY_URL, {body: targets}), clearOutcome);
+        });
+        openContentDialog({ scope, trigger: button, title: REMOVE_DIALOG.title, nodes: [text, actions] });
+        cancel.focus();
    }
    /**
     * The write carries no page signal: once sent it finishes even if the page is left (`writing` then tells the page
-     * not to save a visit that predates it). A failure keeps the selection; a success reloads through `onCategorySet`.
+     * not to save a visit that predates it). A failure keeps the selection, except a changed source, which reloads the
+     * listing as a success does (`onCategorySet`).
     */
-    async function applyCategory(button, { promptIds, skipped, filter }, category) {
+    async function writeCategory(button, send, outcome) {
        categorizing = true;
        const release = busy(button);
-        let result = null;
+        let result = null, failure = null;
        try {
-            result = await api.post(CATEGORY_URL, filter ? { images_filter: filter, category } : { prompt_ids: promptIds, category });
-        } catch {
-            // Reported below; the selection stays as it was.
+            result = await send();
+        } catch (error) {
+            failure = error;
        } finally {
            categorizing = false;
            release();
        }
        if (scope.signal.aborted) return;
-        if (!result) { showWorkspaceToast(CATEGORY_FAILED); return; }
-        if (filter && !result.prompt_count) { showWorkspaceToast(CATEGORY_NONE_LINKED); return; }
-        showWorkspaceToast(filter ? categoryOutcome(updatedCount(result, result.prompt_count), Number(result.skipped) || 0)
-            : categoryOutcome(updatedCount(result, promptIds.length), skipped));
        const focused = document.activeElement === button;
+        if (failure !== null || !result) {
+            showWorkspaceToast(failureMessage(failure));
+            // A changed source reloads the listing (clearing the selection); any other failure keeps it.
+            if (failure?.code !== 'source-changed') return;
+            onCategorySet();
+            if (focused) focusFallback.focus({ preventScroll: true });
+            return;
+        }
+        showWorkspaceToast(outcome(result));
        onCategorySet();
        // The reload hides the bar with the focused action in it, as Clear does: focus moves to the page heading.
        if (focused) focusFallback.focus({ preventScroll: true });
@@ -53,6 +53,14 @@ function queryFor(filters, batchSize) {
    const favorites = filters.favorites ?? false;
    if (typeof favorites !== 'boolean') throw new TypeError('Invalid favorites filter');
    if (favorites) query.set('favorites', '1');
+    // A collection page (#331 D137): the listing keeps only that collection's members; never together with favorites.
+    const collection = filters.collection ?? '';
+    if (collection !== '') {
+        if (favorites || !/^[1-9]\d{0,8}$/.test(typeof collection === 'number' ? String(collection) : collection)) {
+            throw new TypeError('Invalid collection filter');
+        }
+        query.set('collection', String(collection));
+    }
    return query.toString();
 }

@@ -16,6 +16,8 @@ import { RESCAN_FAILED, RESCAN_STARTED, openImportDialog, openRefineDialog, resc
 import { openMetadataScan } from './activity-scan.mjs';
 import { showWorkspaceToast } from './toast.mjs';
 import { imagesFilters, imagesViewState } from './saved-views.mjs';
+import { VIEW_COLLECTION_DELETED, isCollectionGone } from './collections.mjs';
+import { IMAGE_CATEGORIES_URL, mergeCategories } from './images-category.mjs';
 import { displayPreferences } from './preferences.mjs';
 import { onImageTagsSaved } from './image-tagging.mjs';
 import { followImageTagSaves, openCardTagging } from './images-tagging.mjs';
@@ -63,6 +65,8 @@ const IMAGE_SORT_OPTIONS = Object.freeze([['newest', 'Recently added'], ['name',
    ['oldest', 'Oldest first'], ['name-desc', 'Name Z–A']]);
 const MEDIA_OPTIONS = Object.freeze([['all', 'All media'], ['image', 'Images'], ['video', 'Videos']]);
 const RETRY_RESCAN = 'Rescan from Import to retry.';
+// The concept's empty collection (app.js updateImages).
+const NO_MATCHES = 'No matching images. Try another search or category.';
 const RETRY_REFRESH = 'Refresh image collection to retry.';
 /** One alert for whichever of the source discovery and the categories failed, so two failures announce once. */
 function loadFailure(sourcesRetry, categoriesFailed) {
@@ -81,6 +85,17 @@ setFavoriteVisitTarget((key, favorite) => {

 // A tag save made while Images is left (Tags › Auto-tag images) may change what a filtered visit lists: it reloads (M6).
 onImageTagsSaved(() => { if (lastVisit?.filters.tags.length || lastVisit?.filters.q) lastVisit = {...lastVisit, stale: true}; });
+// The filter state a Tags & categories Browse hands to the next Images mount (#332 MC10).
+let browseState = null;
+/**
+ * Open Images filtered by `category` only (every other filter at its default), as Browse opens the Library: Tags &
+ * categories' Browse of a category only images use (#332 MC10, D143).
+ */
+export function browseImages({category} = {}) {
+    if (typeof category !== 'string' || !category) throw new TypeError('browseImages needs a category');
+    browseState = {category};
+    window.location.hash = '#/images';
+}
 /** Forget the last Images visit (its listing, scroll and selection): the next visit reads everything again (S9). */
 export function forgetImagesVisit() {
    lastVisit = null;
@@ -96,10 +111,13 @@ export function selectedImage() {
 * caption: its page heading or dialog title already names it, and `focusTarget` takes a stranded focus.
 * `savedState` opens a saved view (#249 D16) instead of the last visit; `onSaveView(trigger, state)` is Save view.
 * `favorites` is the Favorites page (#249 D51): only favorites are listed, and it neither restores nor replaces the
- * Images last visit.
+ * Images last visit. `collection` (an id) is a collection page (#331 D137): only its members are listed, favorites is
+ * off, and it neither restores nor replaces the last visit either. A listing that answers `collection-not-found` calls
+ * `onCollectionMissing()` when given (the shell shows its deleted-collection page); otherwise (a saved view on a
+ * deleted collection, D140) the page lists nothing and says so.
 */
 export function mountImages(main, api, parentScope, {embedded = false, fetchPage, emptyText, focusTarget = null, savedState = null,
-    favorites = false, onSaveView = () => {}, activity = null} = {}) {
+    favorites = false, collection: collectionId = null, onCollectionMissing = null, onSaveView = () => {}, activity = null} = {}) {
    const scope = createScope();
    const dispose = () => scope.dispose();
    parentScope.signal.addEventListener('abort', dispose, {once:true});
@@ -113,8 +131,15 @@ export function mountImages(main, api, parentScope, {embedded = false, fetchPage
    scope.cleanup(inspection.subscribe(next => detailInspector?.setState(next)));
    scope.cleanup(() => inspection.dispose());
    scope.cleanup(() => detailInspector?.dispose());
+    // A Tags & categories Browse (browseImages) is handed to this mount once: a fresh Images visit filtered by its
+    // category, which becomes the Images return state like any plain visit (as Browse does for the Library).
+    const imagesPage = !embedded && !favorites && collectionId === null;
+    const handed = imagesPage && !savedState ? browseState : null;
+    if (imagesPage) browseState = null;
    const saved = embedded || !savedState ? null : imagesFilters(savedState);
-    const prior = embedded || saved || favorites ? null : lastVisit;
+    // The open collection: the route's, else a saved view's (D140); '' on every other page.
+    const openCollection = embedded ? '' : collectionId !== null ? String(collectionId) : saved?.collection || '';
+    const prior = embedded || saved || favorites || openCollection || handed ? null : lastVisit;
    // A stale visit keeps its filters, layout and size, and lists again instead of restoring (M6).
    const visit = prior?.stale ? null : prior;
    // The layout and size defaults are the Images page's: an embedded gallery (a prompt history's, its dialogs) has no
@@ -126,12 +151,16 @@ export function mountImages(main, api, parentScope, {embedded = false, fetchPage
    let state, geometry = { positions: [], columns: 1, height: 0, maxHeight: 0 }, galleryWidth = 0, optionsRequest, categoryRequest, recovering = false, rescanning = false;
    // Discovered sources (each with its own folders) and every folder, for "Refine this view" and the scope chip.
    let roots = [], folders = [];
+    // The toolbar's current category list (loadCategories), also the Set category suggestions.
+    let categoryNames = [];
    // The open "Refine this view", so a discovery that settles after it opened still lists its sources and folders.
    let refine = null;
    const rendered = new Map();
    const itemIndexes = new Map();
    const filters = { root: 'all', q: '', category: '', tags: [], subfolder: '', media: 'all', sort: 'newest', ...prior?.filters, ...saved,
-        favorites: favorites || saved?.favorites === true };
+        ...(handed ? {category: handed.category} : {}),
+        // A collection and favorites are never both the filter (DC10).
+        favorites: !openCollection && (favorites || saved?.favorites === true), collection: openCollection };
    filters.tags = [...filters.tags];
    if (!IMAGE_SORT_OPTIONS.some(([value]) => value === filters.sort)) filters.sort = 'newest';
    // A saved Source or Folder is only listed once discovery confirms it still exists; until then nothing is fetched.
@@ -142,7 +171,7 @@ export function mountImages(main, api, parentScope, {embedded = false, fetchPage
        // A Set category write still in flight may change what the saved collection shows: the return reloads instead.
        // A favorites-only collection or a saved view is not the plain Images collection, so it never becomes the
        // Images return state (#249 D51, and M2 for saved views).
-        if (!embedded && !filters.favorites && !saved) lastVisit = state && !bar.writing() ? { filters: {...filters, tags: [...filters.tags]}, state, layout, density, selection, checked: bar.checked(), scrollY: window.scrollY } : null;
+        if (!embedded && !filters.favorites && !filters.collection && !saved) lastVisit = state && !bar.writing() ? { filters: {...filters, tags: [...filters.tags]}, state, layout, density, selection, checked: bar.checked(), scrollY: window.scrollY } : null;
        cancelAnimationFrame(restoreFrame);
    });
    main.classList.add('images-main');
@@ -237,7 +266,7 @@ export function mountImages(main, api, parentScope, {embedded = false, fetchPage
    // The concept's empty collection (app.js updateImages), beside the grid because the grid only holds positioned cards.
    // An embedded gallery shows one only when its page names the concept's copy (the history gallery, app.js a620).
    const showsEmpty = !embedded || typeof emptyText === 'string';
-    const empty = el('div', embedded ? emptyText : 'No matching images. Try another search or category.', 'empty');
+    const empty = el('div', embedded ? emptyText : NO_MATCHES, 'empty');
    empty.hidden = true;
    // D47: the history page's shared gallery and dialogs are named by their own heading or title, so they have no caption.
    if (!embedded) collection.append(caption);
@@ -256,6 +285,8 @@ export function mountImages(main, api, parentScope, {embedded = false, fetchPage
    // selection is kept across appended batches and cleared with the collection; the Library-embedded gallery has none.
    const bar = embedded ? null : mountSelectionBar({scope, api, grid, getItems:() => state?.items ?? [], focusFallback,
        checked:visit?.checked, onCategorySet:() => { loadCategories(); reset(); }, activity, onTagged:keys => refreshTagged(keys),
+        // The Set category field suggests the toolbar's categories (#332 MC13).
+        getCategories:() => categoryNames,
        // #392 "Select all N matching": the listing's total and its filter, as the server lists them.
        getListing:() => ({total:state?.total ?? 0, hasMore:Boolean(state?.hasMore), positiveCount:state?.positiveCount ?? null}),
        // A Source filter carries its root's scope, so a renumbered source is refused (source-changed), not acted on.
@@ -457,8 +488,16 @@ export function mountImages(main, api, parentScope, {embedded = false, fetchPage
        if (!resizeFrame) resizeFrame = requestAnimationFrame(() => { resizeFrame = 0; updateLayout(); });
    });
    scope.cleanup(() => { resize.disconnect(); observer?.disconnect(); cancelAnimationFrame(resizeFrame); cancelAnimationFrame(frame); cancelAnimationFrame(loadFrame); });
+    /**
+     * The listing refused the open collection: it was deleted. A saved view says so in place (MC6, D140); a collection
+     * page reports it (`onCollectionMissing`) once per failed read and meanwhile shows the listing's error and Retry,
+     * so a page whose shell cannot confirm the deletion is never left blank.
+     */
+    const collectionGone = next => Boolean(filters.collection) && !onCollectionMissing && isCollectionGone(next.error);
+    let reportedMissing = null;
    function continuationText(next) {
        if (recovering) return 'Images paused until sources and folders are available.';
+        if (collectionGone(next)) return '';
        if (next.error) return 'Images could not be loaded. Retry or rescan the collection.';
        if (next.loading && !next.loaded) return 'Loading images…';
        if (next.hasMore) return `${next.loaded.toLocaleString('en-US')} of ${next.total.toLocaleString('en-US')} ${noun(next.total, 'image')} · more load as you scroll`;
@@ -492,12 +531,20 @@ export function mountImages(main, api, parentScope, {embedded = false, fetchPage
            const added = next.loaded - previous.loaded;
            showWorkspaceToast(`${added.toLocaleString('en-US')} more ${noun(added, 'image')} loaded. ${next.loaded.toLocaleString('en-US')} of ${next.total.toLocaleString('en-US')}.`);
        }
+        const gone = collectionGone(next);
        setText(message, continuationText(next));
-        setAttr(message, 'role', next.error ? 'alert' : 'status');
-        retry.hidden = !next.error;
+        setAttr(message, 'role', next.error && !gone ? 'alert' : 'status');
+        retry.hidden = !next.error || gone;
        more.hidden = !next.hasMore || !!next.error;
        more.setAttribute('aria-disabled', String(next.loading || recovering));
-        if (showsEmpty) empty.hidden = recovering || next.loading || !!next.error || next.hasMore || next.loaded > 0;
+        if (onCollectionMissing && filters.collection && isCollectionGone(next.error) && reportedMissing !== next.error) {
+            reportedMissing = next.error;
+            queueMicrotask(() => { if (!scope.signal.aborted) onCollectionMissing(); });
+        }
+        if (showsEmpty) {
+            setText(empty, gone ? VIEW_COLLECTION_DELETED : embedded ? emptyText : NO_MATCHES);
+            empty.hidden = !gone && (recovering || next.loading || !!next.error || next.hasMore || next.loaded > 0);
+        }
        if (focusAfterLoad !== null && !next.loading) settleLoadFocus(next);
        if (!selection && next.items.length) inspect(next.items[0]);
        scheduleLoad();
@@ -712,24 +759,27 @@ export function mountImages(main, api, parentScope, {embedded = false, fetchPage
            return false;
        }
    }
-    /** The toolbar's categories are the Library's (the linked positive's category, D13). */
+    /**
+     * The toolbar's categories: the Library's (prompts and recipes) and the listed images' own ones (D141, #332), read
+     * in parallel. If only the image list fails, the prompt categories show and the categories alert is raised.
+     */
    async function loadCategories() {
        if (!toolbar) return;
        categoryRequest?.abort();
        const request = new AbortController(); categoryRequest = request;
-        try {
-            const data = await api.get('/prompt_manager/library/options', {signal:request.signal});
-            if (scope.signal.aborted || request !== categoryRequest) return;
-            if (!Array.isArray(data?.categories)) throw new TypeError('Invalid categories');
-            // D36: alphabetical (case-insensitive) whatever order the server sends, a restored category among them.
-            const names = new Set([...data.categories.filter(value => typeof value === 'string' && value), filters.category]);
-            names.delete('');
-            toolbar.setCategories([...names].sort((a, b) => a.localeCompare(b, 'en-US', {sensitivity:'base'}) || (a < b ? -1 : a > b ? 1 : 0)));
-            categoriesFailed = false;
-        } catch {
-            if (scope.signal.aborted || request !== categoryRequest) return;
-            categoriesFailed = true;
-        }
+        const [library, images] = await Promise.allSettled([
+            api.get('/prompt_manager/library/options', {signal:request.signal}),
+            api.get(IMAGE_CATEGORIES_URL, {signal:request.signal}),
+        ]);
+        if (scope.signal.aborted || request !== categoryRequest) return;
+        const valid = result => result.status === 'fulfilled' && Array.isArray(result.value?.categories);
+        if (!valid(library)) { categoriesFailed = true; return; }
+        // D36: alphabetical (case-insensitive) whatever order the server sends, a restored category among them.
+        const names = new Set(mergeCategories(library.value.categories, valid(images) ? images.value.categories : []));
+        if (filters.category) names.add(filters.category);
+        categoryNames = [...names].sort((a, b) => a.localeCompare(b, 'en-US', {sensitivity:'base'}) || (a < b ? -1 : a > b ? 1 : 0));
+        toolbar.setCategories(categoryNames);
+        categoriesFailed = !valid(images);
    }
    scope.cleanup(() => { optionsRequest?.abort(); categoryRequest?.abort(); });
    updateScope();
@@ -1,6 +1,6 @@
 import '../api-client.js';
 import { createButton, createScope } from '../shared/toolkit/core.js';
-import { routes, mountRouter, summarizeStats, routeTitle, loadNavCounts, navigateTo,
+import { routes, mountRouter, summarizeStats, routeTitle, loadNavCounts, navigateTo, COLLECTION_ROUTE,
    LIBRARY_WRITE_COUNTS, NAV_COUNT_ROUTES, FAVORITE_WRITE_COUNTS, FAVORITE_COUNT_DELAY_MS, REVIEW_WRITE_COUNTS } from './state.mjs';
 import { mountWorkspaceTheme } from './theme.mjs';
 import { forgetImagesVisit, mountImages, onFavoriteChange } from './images.mjs';
@@ -11,6 +11,8 @@ import { bindCanvasLink, canvasHref } from './topbar.mjs';
 import { renderHeading, pageHeading } from './heading.mjs';
 import { closeWorkspaceDialog } from './workspace-dialogs.mjs';
 import { createSavedViews, openSaveViewDialog, openEditViewDialog, savedViewHash } from './saved-views.mjs';
+import { createCollections, collectionHash, openEditCollectionDialog, missingNote, DELETED_PAGE_TEXT, OPEN_IMAGES_LINK,
+    LIST_FAILED_TEXT } from './collections.mjs';
 import { createActivityStore } from './activity-store.mjs';
 import { mountActivityPage, mountActivityTopbar } from './activity.mjs';
 import { mountActivityJobView } from './activity-job-view.mjs';
@@ -44,6 +46,7 @@ function mountWorkspace() {
    const main = document.getElementById('workspace-main');
    const primaryNav = document.getElementById('primary-nav');
    const savedNav = document.getElementById('saved-nav');
+    const collectionsNav = document.getElementById('collections-nav');
    const systemNav = document.getElementById('system-nav');
    scope.listen(document.querySelector('.skip'), 'click', event => {
        event.preventDefault();
@@ -83,8 +86,9 @@ function mountWorkspace() {
    // D129: a node-folder library is offered a move (or "Keep it here") above every page.
    mountLibraryBanner(document.getElementById('library-banner'), { api, activity, scope });
    const sidebar = document.querySelector('aside.sidebar');
-    // The route key a nav link carries in `data-route`: a saved view's is `saved/<id>`.
-    const routeKey = route => route.id === 'saved' ? `saved/${route.savedId}` : route.id;
+    // The route key a nav link carries in `data-route`: a saved view's is `saved/<id>`, a collection's `collection/<id>`.
+    const routeKey = route => route.id === 'saved' ? `saved/${route.savedId}`
+        : route.id === 'collection' ? `collection/${route.collectionId}` : route.id;
    let currentKey = null;
    const markCurrent = () => {
        for (const link of sidebar.querySelectorAll('nav [data-route]')) {
@@ -110,6 +114,24 @@ function mountWorkspace() {
        markCurrent();
    }));
    savedViews.load();
+    // COLLECTIONS (#331 /* D136 */): the concept's collections-nav rows (folder icon, name, the listed-member count once
+    // read), without the "PROPOSED" badge. The label shows only while a collection is listed. A failed read keeps the
+    // last rows; a collection page says the list could not be loaded.
+    const collectionsLabel = collectionsNav.previousElementSibling;
+    const collections = createCollections(api, scope.signal);
+    scope.cleanup(collections.subscribe(({ collections: listed }) => {
+        collectionsLabel.hidden = listed.length === 0;
+        collectionsNav.replaceChildren(...listed.map(item => {
+            const link = element('a');
+            link.append(createWorkspaceIcon('folder'), document.createTextNode(item.name));
+            if (Number.isSafeInteger(item.count)) link.append(element('span', item.count.toLocaleString(), 'nav-count'));
+            link.href = collectionHash(item.id);
+            link.dataset.route = `collection/${item.id}`;
+            return link;
+        }));
+        markCurrent();
+    }));
+    collections.load();
    /** The toolbar's Save view on a page: the concept's name dialog, then the store saves the page's full state. */
    const saveView = (page, view) => (trigger, state) => openSaveViewDialog({ scope: view, trigger, q: state.q,
        onSave: name => savedViews.create(page, name, state) });
@@ -167,6 +189,7 @@ function mountWorkspace() {
        forgetLibraryVisit();
        refreshCounts(NAV_COUNT_ROUTES);
        savedViews.load();
+        collections.load();
        if (currentKey !== 'activity') navigateTo(window.location.hash);
    }));
    // S9 I1: a restore this page started that could not run yet (other requests kept reading) hands its review back:
@@ -213,6 +236,10 @@ function mountWorkspace() {
            openSavedView(route, view);
            return;
        }
+        if (route.id === 'collection') {
+            openCollectionPage(route, view);
+            return;
+        }
        renderPage(route, view);
    }

@@ -223,14 +250,16 @@ function mountWorkspace() {
        if (view.signal.aborted) return;
        // A view saved since the list loaded (another tab) is read once more before the link counts as gone.
        if (!savedViews.find(route.savedId) && savedViews.status === 'ready') {
-            await savedViews.load();
+            // settled(), not load()'s own promise: a newer read (a restore, another change) can supersede this one.
+            savedViews.load();
+            await savedViews.settled();
            if (view.signal.aborted) return;
        }
        const saved = savedViews.find(route.savedId);
        if (saved) {
            const page = routes.find(item => item.id === saved.page);
            renderPage({...page, label:saved.name, title:saved.name}, view, saved);
-            mountEditAction(saved, view);
+            mountSavedViewEdit(saved, view);
            return;
        }
        if (savedViews.status === 'ready') {
@@ -238,7 +267,8 @@ function mountWorkspace() {
            window.location.replace('#/images');
            return;
        }
-        const {description} = renderHeading(main, {title:route.label});
+        const {description, h1} = renderHeading(main, {title:route.label});
+        focusTitle(h1);
        description.textContent = 'Saved views could not be loaded. Your saved data has not changed.';
        description.setAttribute('role', 'alert');
        const retry = createButton('Retry');
@@ -249,13 +279,19 @@ function mountWorkspace() {
        main.append(retry);
    }

-    // /* D51 */ The open view's Edit (maintainer ruling): first in the heading's actions. A rename re-reads the list and
-    // retitles the open page; a delete re-reads it and replaces the dead route with the view's plain page.
-    function mountEditAction(saved, view) {
+    // /* D51 */ An open sidebar item's Edit (maintainer ruling): first in the heading's actions; `open(trigger)` opens
+    // its dialog. Saved views and collections (D137) share it.
+    function mountEditAction(view, open) {
        // renderPage has just written the heading.
        const edit = createButton('Edit');
        pageHeading(main).actions.prepend(edit);
-        view.listen(edit, 'click', () => openEditViewDialog({ scope: view, trigger: edit, view: saved,
+        view.listen(edit, 'click', () => open(edit));
+    }
+
+    // A rename re-reads the list and retitles the open page; a delete re-reads it and replaces the dead route with the
+    // view's plain page.
+    function mountSavedViewEdit(saved, view) {
+        mountEditAction(view, trigger => openEditViewDialog({ scope: view, trigger, view: saved,
            onRename: async name => {
                const renamed = await savedViews.rename(saved.id, name);
                if (view.signal.aborted) return;
@@ -268,25 +304,106 @@ function mountWorkspace() {
            } }));
    }

-    function retitle(name) {
+    /** `name` becomes the h1; the breadcrumb and title too unless the page keeps its own (a collection's "Collection"). */
+    function retitle(name, title = name) {
        // Only the mounted view retitles (its rename returns once aborted), so its heading is present.
        pageHeading(main).h1.textContent = name;
-        document.getElementById('workspace-breadcrumb').textContent = name;
-        document.title = `${name} · Prompt Manager`;
+        document.getElementById('workspace-breadcrumb').textContent = title;
+        document.title = `${title} · Prompt Manager`;
    }

-    function renderPage(route, view, saved = null) {
+    /**
+     * #331 D137: `#/collection/<id>` is Images filtered to the collection, its name the h1, "Collection" the breadcrumb
+     * and title (concept a1186–1189), with Edit and the note about members the sources do not list now. An unknown id
+     * is read once more (another tab may have made it), then shows the deleted-collection page.
+     */
+    async function openCollectionPage(route, view) {
+        main.replaceChildren();
+        await collections.settled();
+        if (view.signal.aborted) return;
+        if (!collections.find(route.collectionId) && collections.status === 'ready') {
+            // settled(), not load()'s own promise: the 300 ms count read or a restore can supersede this one.
+            collections.load();
+            await collections.settled();
+            if (view.signal.aborted) return;
+        }
+        let collection = collections.find(route.collectionId);
+        const showAgain = () => { if (!view.signal.aborted) navigateTo(window.location.hash); };
+        if (collection) {
+            renderPage({...COLLECTION_ROUTE, label:collection.name, title:routeTitle(COLLECTION_ROUTE)}, view, null, {collection:collection.id,
+                // The listing found the collection gone meanwhile: the list is read again and, once it no longer lists
+                // the collection, the page is shown again (the deleted-collection page). A failed read, or a list that
+                // still holds it, leaves the listing's own error and Retry (images.mjs).
+                onCollectionMissing:async () => {
+                    collections.load();
+                    await collections.settled();
+                    if (collections.status === 'ready' && !collections.find(route.collectionId)) showAgain();
+                }});
+            // MC3: the note follows every read of the list for the page's life; none while nothing is missing.
+            const note = element('p', '', 'small');
+            const showNote = () => {
+                const text = missingNote(collections.find(route.collectionId)?.missing);
+                note.textContent = text;
+                if (!text) note.remove();
+                else if (!note.isConnected) pageHeading(main)?.description.after(note);
+            };
+            showNote();
+            view.cleanup(collections.subscribe(showNote));
+            // The dialog's Delete question uses the latest stored count.
+            mountEditAction(view, trigger => openEditCollectionDialog({ scope: view, trigger,
+                collection: collection = {...collection, ...collections.find(collection.id), name:collection.name},
+                onRename: async name => {
+                    const renamed = await collections.rename(collection.id, name);
+                    if (view.signal.aborted) return;
+                    collection = {...collection, ...renamed};
+                    retitle(renamed.name, routeTitle(COLLECTION_ROUTE));
+                },
+                onDelete: async () => {
+                    await collections.delete(collection.id);
+                    window.location.replace('#/images');
+                },
+                onGone: () => collections.settled().then(showAgain) }));
+            return;
+        }
+        const {description, h1} = renderHeading(main, {title:route.label});
+        focusTitle(h1);
+        document.title = `${routeTitle(route)} · Prompt Manager`;
+        document.getElementById('workspace-breadcrumb').textContent = routeTitle(route);
+        if (collections.status === 'ready') {
+            // Deleted, or never existed: say so, with the way back to Images.
+            description.textContent = DELETED_PAGE_TEXT;
+            const link = element('a', OPEN_IMAGES_LINK, 'workspace-link');
+            link.href = '#/images';
+            main.append(link);
+            return;
+        }
+        description.textContent = LIST_FAILED_TEXT;
+        description.setAttribute('role', 'alert');
+        const retry = createButton('Retry');
+        view.listen(retry, 'click', () => {
+            collections.load();
+            openCollectionPage(route, view);
+        });
+        main.append(retry);
+    }
+
+    /** The concept focuses its page title on a hashchange navigation (app.js 1168), never on the first render. */
+    function focusTitle(h1) {
+        if (!firstRender) h1.focus();
+        firstRender = false;
+    }
+
+    function renderPage(route, view, saved = null, {collection = null, onCollectionMissing = null} = {}) {
        document.title = `${routeTitle(route)} · Prompt Manager`;
        // The concept's heading(); each view fills its description and actions.
        // The concept focuses its page title on a hashchange navigation (app.js 1168); the skip link focuses `main`.
        const { description, h1 } = renderHeading(main, { title: route.label });
-        if (!firstRender) h1.focus();
-        firstRender = false;
+        focusTitle(h1);
        document.getElementById('workspace-breadcrumb').textContent = routeTitle(route);
-        if (route.id === 'images' || route.id === 'favorites') {
+        if (route.id === 'images' || route.id === 'favorites' || route.id === 'collection') {
            mountNewPromptAction(main, api, view);
            images = mountImages(main, api, view, {savedState:saved?.state, favorites:route.id === 'favorites',
-                onSaveView:saveView('images', view), activity});
+                collection, onCollectionMissing, onSaveView:saveView('images', view), activity});
            return;
        }
        if (route.id === 'library') {
@@ -41,6 +41,8 @@ const FIELDS = Object.freeze({
        folder: text(1024), media: choice(['all', 'image', 'video'], 'all'), tags,
        // A view saved on Favorites (#249 D51) reopens Images filtered to favorites.
        favorites: { fallback: false, accepts: value => typeof value === 'boolean' },
+        // #331 D140: a view saved on a collection page reopens that collection ('' or 1 to 9 digits, no leading zero).
+        collection: { fallback: '', accepts: value => typeof value === 'string' && /^(|[1-9][0-9]{0,8})$/.test(value) },
    }),
    library: Object.freeze({
        q: text(500), category: text(100), sort: choice(['newest', 'oldest', 'name', 'rating'], 'newest'), tags,
@@ -54,10 +56,13 @@ export function normalizeViewState(page, state) {
    const fields = FIELDS[page];
    if (!fields) throw new TypeError(`Unknown saved-view page: ${page}`);
    const source = state && typeof state === 'object' && !Array.isArray(state) ? state : {};
-    return Object.fromEntries(Object.entries(fields).map(([key, field]) => {
+    const normalized = Object.fromEntries(Object.entries(fields).map(([key, field]) => {
        const value = field.accepts(source[key]) ? source[key] : field.fallback;
        return [key, Array.isArray(value) ? [...value] : value];
    }));
+    // Favorites and a collection are never both a view's filter: the collection wins, as the listing does (D140).
+    if (normalized.favorites === true && normalized.collection) normalized.favorites = false;
+    return normalized;
 }

 /** True when the state's compact JSON fits the API's 4 KB cap (the server's encoding: no spaces, UTF-8). */
@@ -96,11 +101,12 @@ export const savedViewHash = id => `#/saved/${id}`;
 export function imagesFilters(state) {
    const view = normalizeViewState('images', state);
    return { q: view.q, category: view.category, sort: view.sort, root: view.source, subfolder: view.folder, media: view.media,
-        tags: view.tags, favorites: view.favorites };
+        tags: view.tags, favorites: view.favorites, collection: view.collection };
 }
 export function imagesViewState(filters) {
    return normalizeViewState('images', { q: filters.q, category: filters.category, sort: filters.sort, source: filters.root,
-        folder: filters.subfolder, media: filters.media, tags: filters.tags, favorites: filters.favorites === true });
+        folder: filters.subfolder, media: filters.media, tags: filters.tags, favorites: filters.favorites === true,
+        collection: filters.collection == null ? '' : String(filters.collection) });
 }

 /** Library shelf filters (library.mjs `filters`) from a saved state, and the state of the current filters. */
@@ -215,14 +221,20 @@ export function openSaveViewDialog({ scope, trigger, q, onSave }) {
 }

 /**
- * D51: the open view's Edit dialog. "View name" (Save keeps the dialog open on an empty name; an unchanged one closes it), then Delete… (danger), Cancel
- * and Save. Delete… swaps the same dialog to its confirmation, Cancel / Delete (its Cancel closes the dialog), so nothing is removed by one press and
- * no browser `confirm()` appears. `onRename(name)` and `onDelete()` return the store's promise; the toast reports either
- * outcome, and the shell navigates after a delete.
+ * D51: an open sidebar item's Edit dialog, shared by saved views and collections (#331 D137) with their own nouns. The
+ * name field (Save keeps the dialog open on an empty name; an unchanged one closes it), then Delete… (danger), Cancel
+ * and Save. Delete… swaps the same dialog to its confirmation, Cancel / Delete (its Cancel closes the dialog), so
+ * nothing is removed by one press and no browser `confirm()` appears. `onRename(name)` and `onDelete()` return the
+ * store's promise; the toast reports either outcome, and the shell navigates after a delete.
+ *
+ * `nouns`: `title`, `label`, `deleteTitle`, `deleteText(item)`, `renamed`, `renameFailed`, `deleted`, `deleteFailed`.
+ * By default the dialog closes before the rename is sent (saved views). `renameError(error)` instead keeps it open
+ * while the rename runs and maps a failure: `{field: text}` writes the message under the field and keeps the dialog,
+ * `{toast: text, close}` toasts it and closes the dialog only when `close` is true; null is `renameFailed`, kept open.
 */
-export function openEditViewDialog({ scope, trigger, view, onRename, onDelete }) {
+export function openEditDialog({ scope, trigger, item, nouns, onRename, onDelete, renameError = null }) {
    const input = document.createElement('input');
-    input.value = view.name;
+    input.value = item.name;
    input.maxLength = MAX_NAME_LENGTH;
    const remove = createButton('Delete…', 'danger');
    const cancel = createButton('Cancel');
@@ -230,28 +242,69 @@ export function openEditViewDialog({ scope, trigger, view, onRename, onDelete })
    const actions = document.createElement('div');
    actions.className = 'dialog-actions';
    actions.append(remove, cancel, save);
+    const message = document.createElement('p');
+    message.className = 'small';
+    message.setAttribute('role', 'alert');
+    message.hidden = true;
+    const say = text => { message.textContent = text; message.hidden = !text; };
    cancel.addEventListener('click', () => closeWorkspaceDialog());
    save.addEventListener('click', async () => {
        const name = input.value.trim();
        if (!name) { input.focus(); return; }
-        closeWorkspaceDialog();
-        if (name === view.name) return;
+        if (!renameError || name === item.name) closeWorkspaceDialog();
+        if (name === item.name) return;
+        if (!renameError) {
+            try {
+                await onRename(name);
+                showWorkspaceToast(nouns.renamed);
+            } catch {
+                if (!scope.signal.aborted) showWorkspaceToast(nouns.renameFailed);
+            }
+            return;
+        }
+        // Kept open: one rename at a time, its outcome shown in place.
+        say('');
+        for (const button of [remove, cancel, save]) button.disabled = true;
+        // Closed meanwhile (Escape, Close): the outcome is only toasted, and a dialog opened since is left alone.
+        const stillOpen = () => input.isConnected;
        try {
            await onRename(name);
-            showWorkspaceToast(RENAMED_TOAST);
-        } catch {
-            if (!scope.signal.aborted) showWorkspaceToast(RENAME_FAILED_TOAST);
+            if (scope.signal.aborted) return;
+            if (stillOpen()) closeWorkspaceDialog();
+            showWorkspaceToast(nouns.renamed);
+        } catch (error) {
+            if (scope.signal.aborted) return;
+            for (const button of [remove, cancel, save]) button.disabled = false;
+            const outcome = renameError(error) ?? { toast: nouns.renameFailed };
+            if (!stillOpen()) { showWorkspaceToast(outcome.field ?? outcome.toast); return; }
+            if (outcome.field) { say(outcome.field); input.focus(); return; }
+            if (outcome.close) closeWorkspaceDialog();
+            showWorkspaceToast(outcome.toast);
        }
    });
-    remove.addEventListener('click', () => confirmDelete({ scope, trigger, view, onDelete }));
-    openContentDialog({ scope, trigger, title: 'Edit saved view', nodes: [field('View name', input, 'action-input'), actions] });
+    remove.addEventListener('click', () => confirmDelete({ scope, trigger, item, nouns, onDelete }));
+    // The message line exists only where a failure keeps the dialog open (the saved views' dialog is unchanged).
+    const nodes = renameError ? [field(nouns.label, input, 'action-input'), message, actions] : [field(nouns.label, input, 'action-input'), actions];
+    openContentDialog({ scope, trigger, title: nouns.title, nodes });
    input.focus();
    input.select();
 }

-function confirmDelete({ scope, trigger, view, onDelete }) {
+/** The saved views' nouns for the shared Edit dialog (D51). */
+export const SAVED_VIEW_NOUNS = Object.freeze({
+    title: 'Edit saved view', label: 'View name', deleteTitle: 'Delete saved view',
+    deleteText: view => `Delete “${view.name}”? Only the saved view is removed; its images and prompts stay.`,
+    renamed: RENAMED_TOAST, renameFailed: RENAME_FAILED_TOAST, deleted: DELETED_TOAST, deleteFailed: DELETE_FAILED_TOAST,
+});
+
+/** D51: the open view's Edit dialog. */
+export function openEditViewDialog({ scope, trigger, view, onRename, onDelete }) {
+    openEditDialog({ scope, trigger, item: view, nouns: SAVED_VIEW_NOUNS, onRename, onDelete });
+}
+
+function confirmDelete({ scope, trigger, item, nouns, onDelete }) {
    const text = document.createElement('p');
-    text.textContent = `Delete “${view.name}”? Only the saved view is removed; its images and prompts stay.`;
+    text.textContent = nouns.deleteText(item);
    const actions = document.createElement('div');
    actions.className = 'dialog-actions';
    const cancel = createButton('Cancel');
@@ -262,11 +315,11 @@ function confirmDelete({ scope, trigger, view, onDelete }) {
        closeWorkspaceDialog();
        try {
            await onDelete();
-            showWorkspaceToast(DELETED_TOAST);
+            showWorkspaceToast(nouns.deleted);
        } catch {
-            if (!scope.signal.aborted) showWorkspaceToast(DELETE_FAILED_TOAST);
+            if (!scope.signal.aborted) showWorkspaceToast(nouns.deleteFailed);
        }
    });
-    openContentDialog({ scope, trigger, title: 'Delete saved view', nodes: [text, actions] });
+    openContentDialog({ scope, trigger, title: nouns.deleteTitle, nodes: [text, actions] });
    cancel.focus();
 }
@@ -25,7 +25,8 @@ export const routes = [
        description: 'Configuration, maintenance and recovery—with browsing kept in the workspace.', action: 'Open System' },
 ];

-const NATIVE_ROUTES = new Set(['images', 'library', 'tags', 'inspect', 'overview', 'saved', 'favorites', 'activity', 'review', 'system']);
+const NATIVE_ROUTES = new Set(['images', 'library', 'tags', 'inspect', 'overview', 'saved', 'favorites', 'activity', 'review', 'system',
+    'collection']);

 /**
 * System's sections in the concept's order (app.js `systemSections` 635–644); the concept's `general` is production's
@@ -45,6 +46,13 @@ export function isSystemSection(id) {
 /** A saved view (#249 D16): the shell resolves its id to the view's page, name and state. */
 const SAVED_ROUTE = Object.freeze({ id: 'saved', label: 'Saved view' });

+/**
+ * A collection (#331 D137): `#/collection/<id>` is Images filtered to its members. Not a `routes` entry (no Overview
+ * card, no WORKSPACE link); the shell names the page after the collection, the breadcrumb and title stay "Collection"
+ * (concept render a1186–1189).
+ */
+export const COLLECTION_ROUTE = Object.freeze({ id: 'collection', label: 'Collection' });
+
 /** Breadcrumb and document title: the concept names a few pages differently from their nav label. */
 export function routeTitle(route) {
    return route.title || route.label;
@@ -58,6 +66,9 @@ export function isHandoff(route) {
 export function resolveRoute(hash) {
    const saved = /^#\/saved\/([1-9]\d*)$/.exec(hash);
    if (saved && Number.isSafeInteger(Number(saved[1]))) return {...SAVED_ROUTE, savedId:Number(saved[1]), hash};
+    // A collection id is the routes' 1 to 9 digits without a leading zero.
+    const collection = /^#\/collection\/([1-9]\d{0,8})$/.exec(hash);
+    if (collection) return {...COLLECTION_ROUTE, collectionId:Number(collection[1]), hash};
    // One job of the Activity page (its id is the registry's uuid4 hex).
    const job = /^#\/activity\/([0-9a-f]{32})$/.exec(hash);
    if (job) return {...routes.find(route => route.id === 'activity'), jobId:job[1], hash};
@@ -151,7 +162,7 @@ export function mountRouter(win, onRoute) {
        const hash = route.hash || `#/${route.id}`;
        if (win.location.hash !== hash) win.history.replaceState(win.history.state, '', hash);
        if (current?.id === route.id && current?.positiveId === route.positiveId && current?.savedId === route.savedId &&
-            current?.jobId === route.jobId && current?.section === route.section) return;
+            current?.collectionId === route.collectionId && current?.jobId === route.jobId && current?.section === route.section) return;
        current = route;
        onRoute(route);
    };
@@ -29,7 +29,7 @@ import { HOST_UNAVAILABLE } from './system-appearance.mjs';
 import { openCloseOnlyReview, openReviewDialog } from './workspace-dialogs.mjs';
 import { BACKUP_COPY, backupText, holding, reviewRefusal } from './maintenance-review.mjs';
 import { busyToast, downloadDatabaseBackup } from './activity-scan.mjs';
-import { MODEL_OPTIONS } from './image-tagging-state.mjs';
+import { MODEL_OPTIONS, installCommand, missingPackages, needsPackages, packageList } from './image-tagging-state.mjs';
 import { openImageTagging } from './image-tagging.mjs';
 import { selectedImage } from './images.mjs';
 import { NO_SELECTION } from './vocabulary.mjs';
@@ -80,6 +80,7 @@ export const STATUS_COPY = Object.freeze({
    loaded: 'Downloaded and loaded.',
    partial: 'Partly downloaded. Download again to finish.',
    missing: size => `Not downloaded. Download size ${size}.`,
+    needs: (names, command, note) => `Downloaded. Needs ${names}: ${command}.${typeof note === 'string' && note.trim() ? ` ${note}` : ''}`,
 });

 /** The messages that name a setting the section cannot use (the server's own wording). */
@@ -140,15 +141,21 @@ export function modelOptions(models) {

 /**
 * D132: the Tagging model description for `status` (`{phase: loading|loaded|failed, models}`) and the chosen `model`.
- * GGUF with only one of its two files on disk is partly downloaded.
+ * GGUF with only one of its two files on disk is partly downloaded. A backend package the server cannot import (#424)
+ * turns "Downloaded" into "Downloaded. Needs <pkg>: pip install <pkg>." and adds "Also needs <pkg>." otherwise.
 */
 export function modelDescription(status, model) {
    if (status?.phase === 'loading') return STATUS_COPY.loading;
    const entry = status?.models?.[model];
    if (status?.phase !== 'loaded' || !object(entry)) return STATUS_COPY.failed;
-    if (entry.downloaded === true) return entry.loaded === true ? STATUS_COPY.loaded : STATUS_COPY.downloaded;
-    if (partlyDownloaded(model, entry)) return STATUS_COPY.partial;
-    return STATUS_COPY.missing(modelSize(model, entry));
+    // #424: a backend package that cannot be imported; a model on disk without it never reads as ready.
+    const needs = missingPackages(entry).length ? packageList(entry) : '';
+    if (entry.downloaded === true) {
+        if (needs) return STATUS_COPY.needs(needs, installCommand(entry), entry.install_note);
+        return entry.loaded === true ? STATUS_COPY.loaded : STATUS_COPY.downloaded;
+    }
+    const files = partlyDownloaded(model, entry) ? STATUS_COPY.partial : STATUS_COPY.missing(modelSize(model, entry));
+    return needs ? `${files} Also needs ${needs}.` : files;
 }

 /** GGUF with only one of its two files on disk (a download that did not finish). */
@@ -316,6 +323,7 @@ export function diskShortNote(disk) {
 export function batchCloseNote(plan) {
    if (plan.review_required === true) return REPLACE_NOTE;
    if (plan.model?.downloaded === false) return notDownloaded(modelLabel(plan.model.type, plan.model));
+    if (missingPackages(plan.model).length) return needsPackages(modelLabel(plan.model.type, plan.model), plan.model);
    if (plan.disk?.sufficient === false) return diskShortNote(plan.disk);
    if (!Number.isSafeInteger(plan.images) || plan.images === 0) return NO_IMAGES;
    if (plan.to_tag === 0) return NOTHING_TO_TAG;
@@ -484,8 +492,9 @@ export function mountTagging(container, { api, activity, scope, drafts, notify =
        unload.disabled = !(status.phase === 'loaded' && status.loadedType);
        if (review.textContent === 'Reviewing…') return;
        const batchProblem = known() ? draftProblem(values, { limit: false }) : unknown;
-        setAvailable(review, entry?.downloaded === false ? notDownloaded(modelLabel(values.autotag_model_type, entry))
-            : batchProblem?.message);
+        const label = modelLabel(values.autotag_model_type, entry);
+        setAvailable(review, entry?.downloaded === false ? notDownloaded(label)
+            : needsPackages(label, entry) || batchProblem?.message);
    };

    let reads = 0;
@@ -254,6 +254,23 @@ export function browseFilters(kind, value) {
        : {text: '', category: value, tags: [], sort: 'newest'};
 }

+/**
+ * A category row's count (#332 D143): "N positive prompts" when no image holds it as its own category, "N positive
+ * prompts · M images" when both do, "M images" when only images do (stored rows, files on disk or not).
+ */
+export function categoryRowText(category) {
+    const prompts = count(category?.prompt_count) ? category.prompt_count : 0;
+    const images = count(category?.image_count) ? category.image_count : 0;
+    if (!images) return countOf(prompts, 'positive prompt');
+    if (!prompts) return countOf(images, 'image');
+    return `${countOf(prompts, 'positive prompt')} · ${countOf(images, 'image')}`;
+}
+
+/** Where a category's Browse opens: the Library while prompts hold it, else Images (MC10, its Library would be empty). */
+export function categoryBrowseTarget(category) {
+    return count(category?.prompt_count) && category.prompt_count > 0 ? 'library' : 'images';
+}
+
 /** The exact tag's current owner counts, for the delete confirmation. Throws on any unconfirmed shape. */
 export function readTagImpact(api, row, {signal} = {}) {
    requireRow(row);
@@ -9,12 +9,11 @@
 * constraint to the existing Library filters.
 */
 import { createButton } from '../shared/toolkit/core.js';
-import { browseFilters, createVocabularyCommand, createVocabularyStream } from './vocabulary-state.mjs';
-import { countOf } from './plural.mjs';
+import { browseFilters, categoryBrowseTarget, categoryRowText, createVocabularyCommand, createVocabularyStream } from './vocabulary-state.mjs';
 import { browseLibrary, invalidateLibraryAfterWrite } from './library.mjs';
 import { createVocabularyDialog } from './vocabulary-dialog.mjs';
 import { pageHeading } from './heading.mjs';
-import { selectedImage } from './images.mjs';
+import { browseImages, selectedImage } from './images.mjs';
 import { onImageTagsSaved, openImageTagging } from './image-tagging.mjs';
 import { showWorkspaceToast } from './toast.mjs';

@@ -64,7 +63,7 @@ function tagRow(tag) {
 }

 function categoryRow(category) {
-    const {row, button} = operation(category.value, countOf(category.prompt_count, 'positive prompt'), 'Browse');
+    const {row, button} = operation(category.value, categoryRowText(category), 'Browse');
    button.dataset.action = 'browse';
    return row;
 }
@@ -211,7 +210,10 @@ export function mountVocabulary(main, api, scope) {
    scope.listen(categoryRows, 'click', event => {
        const button = event.target.closest('button[data-action="browse"]');
        const category = button && categories.itemOf(button.closest('.operation'));
-        if (category) browseLibrary(browseFilters('categories', category.value));
+        if (!category) return;
+        // MC10: a category only images hold opens Images filtered by it; the Library would be empty.
+        if (categoryBrowseTarget(category) === 'images') browseImages({category: category.value});
+        else browseLibrary(browseFilters('categories', category.value));
    });

    let settled = Promise.resolve();
@@ -316,18 +316,29 @@ export function openCopyFallback(text, { scope, trigger = null, title = 'Copy pr
    area.select();
 }

+export const INPUT_SUGGESTIONS_ID = 'workspace-input-suggestions';
+
 /**
 * The concept's `simpleInput`: one labelled `input#action-input` (starting at `value`), then Cancel and the primary
 * `action`. The action reports the trimmed value and closes; an empty value keeps the dialog open on its field, or
 * reports `fallback` when one is given (Save view's "Saved view", a1339). A positive `maxLength` limits the field.
 * `validate(value)` may refuse a value with a message: the dialog then stays open with the typed text and the field
- * reports the message (its native validity) until it is edited.
+ * reports the message (its native validity) until it is edited. `suggestions` (text list) offers values in a
+ * `<datalist>` under the field; `secondary` (`{label, onClick}`) adds a button between Cancel and the action that
+ * closes the dialog and runs `onClick` (#332).
 */
 export function openInputDialog({ scope, title, label, action, value = '', maxLength, fallback, onApply, trigger = null,
-    validate = null }) {
+    validate = null, suggestions = null, secondary = null }) {
    requireScope(scope);
    requireCallbacks({ onApply });
    if (validate !== null) requireCallbacks({ validate });
+    if (suggestions !== null && (!Array.isArray(suggestions) || suggestions.some(item => typeof item !== 'string'))) {
+        throw new TypeError('The input dialog suggestions must be text');
+    }
+    if (secondary !== null && (typeof secondary?.label !== 'string' || !secondary.label)) {
+        throw new TypeError('The input dialog secondary action needs a label');
+    }
+    if (secondary !== null) requireCallbacks({ onClick: secondary.onClick });
    for (const [name, text] of Object.entries({ title, label, action })) {
        if (typeof text !== 'string' || !text) throw new TypeError(`The input dialog needs a ${name}`);
    }
@@ -355,8 +366,25 @@ export function openInputDialog({ scope, title, label, action, value = '', maxLe
        onApply(entered);
    });
    const actions = el('div', undefined, 'dialog-actions');
-    actions.append(cancel, apply);
-    show(title, [field(label, input, 'action-input'), actions], { scope, trigger, focusTarget: input });
+    actions.append(cancel);
+    if (secondary !== null) {
+        // Between Cancel and the primary action; it closes the dialog first (#332 "Use prompt category").
+        const other = createButton(secondary.label);
+        other.addEventListener('click', () => { finish(); secondary.onClick(); });
+        actions.append(other);
+    }
+    actions.append(apply);
+    const nodes = [field(label, input, 'action-input')];
+    if (suggestions?.length) {
+        // Its own id: `datalist#categories` and `#vocabulary-category-options` belong to other pages' fields.
+        const list = el('datalist');
+        list.id = INPUT_SUGGESTIONS_ID;
+        for (const value of suggestions) { const option = el('option'); option.value = value; list.append(option); }
+        input.setAttribute('list', INPUT_SUGGESTIONS_ID);
+        nodes.push(list);
+    }
+    nodes.push(actions);
+    show(title, nodes, { scope, trigger, focusTarget: input });
 }

 /**
@@ -12,6 +12,9 @@ main:focus-visible { outline: 2px solid var(--ca-focus); outline-offset: 4px; }
   sidebar's min-content (the concept's `1fr`); the column is capped at the viewport as production's shell was. */
@media (max-width: 950px) {
    .app-shell { grid-template-columns: minmax(0, 1fr); /* D31 */ }
+    /* D136 (#331): the concept hides COLLECTIONS here, which would leave a phone no way to open a collection; its rows
+       wrap like every other sidebar nav (the concept's `.sidebar nav` flex row). Its label stays hidden, as all are. */
+    #collections-nav { display: flex; /* D136 */ }
 }
@media (forced-colors: active) {
    nav a[aria-current="page"] { border: 2px solid Highlight; color: LinkText; }
@@ -446,3 +449,7 @@ pre.prompt-text { font: inherit; font-size: 12px; line-height: 1.75; margin-bloc
   outside 1–500 is highlighted as a refused setting is (D92). */
 .toolbar #log-limit { inline-size: 6em; min-height: 36px; font-size: 11px; /* D109 */ }
 .toolbar #log-limit[aria-invalid="true"] { outline: 2px solid var(--red); outline-offset: 2px; /* D109 */ }
+
+/* #332 D146: the category chip names its origin (" · this image", " · prompt", " · recipe") in muted text that never
+   splits; at 390px the chip may wrap between the category and its origin. */
+.chip .chip-source { color: var(--ca-muted); white-space: nowrap; }
@@ -25,6 +25,9 @@
            <!-- D49: the concept's SAVED VIEWS group without its "PROPOSED" badge (saved views are persisted, #249 D16). -->
            <div class="sidebar-label">SAVED VIEWS</div>
            <nav id="saved-nav" aria-label="Saved views"></nav>
+            <!-- D136: the concept's COLLECTIONS group without its "PROPOSED" badge; the label shows once a collection is listed. -->
+            <div class="sidebar-label" hidden>COLLECTIONS</div>
+            <nav id="collections-nav" aria-label="Collections"></nav>
            <div class="sidebar-bottom">
                <nav id="system-nav" aria-label="Tools and system"></nav>
                <div class="connection"><i></i><div>ComfyUI workspace<small>Your library, on your server</small></div></div>