feat(images): set an image's own category, show its origin and count image categories (#332, PR 3) (#428)

* feat(images): store images' own categories in the library database (#332)

One new table, image_categories, and its category index, created empty
by a forward-only migration that reads and writes only its own objects.
Startup checks the structure; restore also checks the values. The store
sets, clears and reads own categories by file key (the deepest output
source holding the file and the path below it), and copies a removed
duplicate's category to a kept copy that has none.

* feat(images): duplicate cleanup keeps images' own categories (#332)

The kept copy's own category wins; a kept copy without one receives the
removed copy's, keyed by the deepest output source holding each file.
The removed copy's row is never deleted, so a give-back or a failed
delete loses nothing. The job log reports how many were kept.

* feat(images): set, remove and list images' own categories (#332)

PUT /prompt_manager/images/category sets the own category of up to 500
listed files, DELETE removes it (listed or not), and
GET /prompt_manager/images/categories lists the values whose file is
listed. Targets are the Images listing identity of an output source,
checked by media_target (shared with Collections). The routes never
touch prompts, recipes or links; POST /prompt_manager/bulk/category is
unchanged.

* feat(vocabulary): count and rename image categories (#332)

Tags & categories lists every category value with image_count, the
stored image_categories rows holding it. Values only images hold follow
every prompt-backed value (first_pid at SQLite's INTEGER maximum), so
keyset cursors cross the boundary. /library/options keeps its own query
and never lists image-only values.

Manage category counts image rows (impact.images), treats an image-held
target as existing, renames image rows in the same transaction, allows
renaming an image-only value, and hashes the sorted image rowids into
the impact token so a change between preview and apply is refused with
vocabulary-conflict. Every image-category statement reads
idx_image_categories_category.

* feat(images): the category filter matches each image's effective category (#332)

An image's own category wins; without one it inherits its link's: the
recipe's category when set, else the positive prompt's (MC4, one rule
with the inspector chip). Ambiguous and unlinked images inherit nothing,
so an unlinked image with its own category is now listed. The link read
no longer filters by category in SQL; the page filter, select all N
matching and saved views compare the effective value. A failed
own-category read answers the existing listing-failed 500.

* fix(images): key symlinked output folders and keep key work off the event loop (#332)

Review fixes: a source matches by its configured spelling too, so a
detected output folder that is a symlink keys its files (routes and
duplicate cleanup). File keys are computed in the executor. A path no
source holds is a plain 403, a lone surrogate a 400. The install repairs
a table that lacks its category index instead of refusing to open.

* feat(inspector): show an image's own category in the inspector and History (#332)

The inspector's library facts gain category_scope "image": an image's
own category overrides the inherited one for any link status (linked,
ambiguous, none). Images reads it for output sources only; History reads
it once per inspection inside its snapshot, keyed by the same file key
from the symlink-resolved output folder. A failed read hides the chip
rather than show a possibly wrong value. The chip's hidden prefix names
the origin ("Image category: "); the visible origin text comes in PR 3.

* perf(images): keep the category filter's link read narrow; record D141, D142, D145 (#332)

Under a category the link read keeps only links whose raw recipe or
positive category is the value (Python still decides the inherited
one), the links of images whose own category is the value are read by
path, and plain reads skip the inherited-category work. The own-category
map is keyed by normalized path. TESTING.md records D141, D142 and D145
and amends D13, D36 and D39; the filter budget seeds 2,000 own
categories.

* feat(images): set or remove a category on all N matching images (#332)

The category routes also accept the Images listing filter of "Select
all N matching" (#392) instead of explicit items, resolved now and
capped at 500 images like an explicit selection.

* fix(images): Windows path keys for own categories; plan check for the category read (#332)

Review fixes: on Windows the own-category map keys each file with
normalize_image_path (abspath drops trailing dots and spaces), and the
plan test also covers the category's narrowing clause.

* feat(images): Set category sets each image's own category; the chip names its origin (#332)

The selection bar's Set category writes the selected images' own
category (linked or not, up to 500, or all N matching up to 500), with
the toolbar categories as suggestions; Use prompt category removes it
after a confirmation that states the count. It never writes a prompt
(#259's prompt action is retired from Images; the Library editor and
the legacy admin Set Category still change prompt categories). The
toolbar lists the listed images' own categories beside the prompt and
recipe ones. The inspector chip shows its origin: "· this image",
"· prompt" or "· recipe". Tags & categories counts images and opens
Images for a category only images use.

* test(images): compare the category chip's visible origin against the concept (#332)

D146: the inspector comparison measures each chip's span.chip-source and
lays the concept's own chip out with the recorded rule and origin added at
runtime (withChipSource), in the side panel and the viewer's details. The
D39 recipe case asserts the visible " · prompt"; the mutation check
removes the origin.

* test(images): compare Set category and the category options against the concept (#332)

With one image's own category set through the real route, the toolbar's
#category-filter options are compared with D141 mapped (the image category
sorted in with the Library's, D36), and the Set category dialog against the
concept's simpleInput laid out as recorded at runtime: D140 (empty field,
datalist#workspace-input-suggestions of the toolbar's categories, Use prompt
category between Cancel and Apply) and D8 (Apply). Unmapped, the dialog
differs only in those parts.

* test(history): compare the History media inspector's category chip against the concept (#332)

D145: with an own category set on the baseline's newest output, the
Recorded run viewer's chip is compared with the concept viewer's category
chip laid out with the D146 origin and the own category at runtime; D21
maps its hidden "Image category: " prefix. Unmapped, the two differ only
in the text, the prefix, the width and span.chip-source.

* test(images): Set category sets each image's own category in page workflows (#332)

Replace the #259 prompt-category tests with CUJ 1, 2, 3, 8 and 10, the
suggestions datalist, the 500-image limit, the source-changed path, D142
and coded refusals; Images never posts /prompt_manager/bulk/category.

* test(inspector): the category chip names its origin in the panel, viewer and History (#332)

CUJ 4 and 5: "· this image", "· prompt" and "· recipe" chips, an
unlinked file's own category, and History's current-file inspector.

* test(vocabulary): category rename covers image categories; image-only rows browse Images (#332)

CUJ 6 and 7 with own categories set through the API on two output files.

* test(vocabulary): compare image-category rows and the Manage category preview against the concept (#332)

The vocabulary fixture seeds own image categories on request
(image_categories: Landscapes on two images, Portraits on one image only).
mapVocabularyConcept maps D143 ("N positive prompts · M images", image-only
rows before Manage category), a model checked against the concept page with
those rows added at runtime, and mapVocabularyDialog takes the preview
sentence, so the Manage category preview is compared with D9 and D144's
images. The default fixture and mapping are unchanged.

* test(vocabulary): park the pointer before measuring the category rows (#332)

Firefox kept the pointer where the concept's Review was pressed, over the
production Portraits row's Browse, so that button was measured hovered.

* docs(testing): record D140, D143, D144 and D146 and the image category UI (#332)

D140 (Set category writes images' own categories), D146 (the chip's visible
origin) beside D141, D142 and D145; D143 and D144 in the vocabulary
section. D8, D21 (the D20/D21 side panel) and D39 amended; the D8, the
"all N matching" and the Native vocabulary UI paragraphs name the Prompt
library editor and the legacy admin "Set Category" for prompt
categories; the #332 section lists the interface and its comparisons.

* test(vendor): count the #332 host case in the execution matrix

image-attribution.spec.mjs gains the image category route case, so the
execution config lists 92 tests (3 attribution cases per project).

* fix(images): focus after a changed source; Browse is a fresh Images visit (#332)

Review fixes: a 409 source-changed reload moves focus to the heading as a
success does; a selection the listing no longer holds says none could be
found instead of sending nothing; a Tags & categories Browse opens a
plain Images visit filtered by the category (remembered and with the
Appearance defaults) rather than a saved-view visit.

* test(legacy): record the image category routes in the legacy contract snapshot (#332)

#332 adds PUT/DELETE /prompt_manager/images/category and
GET /prompt_manager/images/categories; the legacy pages' routes are
unchanged.

* refactor(images): take the selection bar's categories from its one caller (#332)

The getCategories default was never used (images.mjs always passes the
toolbar's categories) and left images-selection.mjs function coverage at 97.05
(floor 98).

web/js/workspace/workspace.css

@@ -446,3 +446,7 @@ 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; }