diff --git a/.github/branch-protection.json b/.github/branch-protection.json
new file mode 100644
index 0000000..da18229
--- /dev/null
+++ b/.github/branch-protection.json
@@ -0,0 +1,25 @@
+{
+  "required_status_checks": {
+    "strict": true,
+    "contexts": [
+      "py3.10 on ubuntu-latest",
+      "py3.11 on ubuntu-latest",
+      "py3.12 on ubuntu-latest",
+      "py3.10 on windows-latest",
+      "py3.11 on windows-latest",
+      "py3.12 on windows-latest",
+      "py3.10 on macos-latest",
+      "py3.11 on macos-latest",
+      "py3.12 on macos-latest",
+      "coverage gate (85%)",
+      "black and flake8",
+      "frontend modules",
+      "viewerjs"
+    ]
+  },
+  "enforce_admins": true,
+  "required_pull_request_reviews": null,
+  "restrictions": null,
+  "allow_force_pushes": false,
+  "allow_deletions": false
+}
diff --git a/.github/workflows/viewerjs-check.yml b/.github/workflows/viewerjs-check.yml
index 46d7a28..f6f05f3 100644
--- a/.github/workflows/viewerjs-check.yml
+++ b/.github/workflows/viewerjs-check.yml
@@ -2,22 +2,9 @@ name: Viewer.js vendor and compatibility
 
 on:
   pull_request:
-    paths:
-      - 'tools/vendor/**'
-      - 'tests/vendor/**'
-      - 'tests/js/**'
-      - 'web/js/**'
-      - 'web/lib/**'
-      - '.github/workflows/viewerjs-*.yml'
+    branches: [main]
   push:
     branches: [main]
-    paths:
-      - 'tools/vendor/**'
-      - 'tests/vendor/**'
-      - 'tests/js/**'
-      - 'web/js/**'
-      - 'web/lib/**'
-      - '.github/workflows/viewerjs-*.yml'
   workflow_dispatch:
 
 permissions:
@@ -26,8 +13,15 @@ permissions:
 jobs:
   viewerjs:
     runs-on: ubuntu-latest
+    timeout-minutes: 15
     steps:
       - uses: actions/checkout@v7
+      - uses: actions/setup-python@v7
+        with:
+          python-version: '3.12'
+          cache: pip
+          cache-dependency-path: requirements-dev.txt
+      - run: python -m pip install -r requirements-dev.txt
       - uses: actions/setup-node@v7
         with:
           node-version: '24'
@@ -36,6 +30,18 @@ jobs:
       - run: npm ci --prefix tools/vendor --ignore-scripts
       - run: npm run --prefix tools/vendor check
       - run: npm run --prefix tools/vendor test
-      - run: node --test tests/js/*.test.js
-      - run: npx --prefix tools/vendor playwright install --with-deps chromium
-      - run: npm run --prefix tools/vendor test:browser
+      - run: npx --prefix tools/vendor playwright install --with-deps chromium firefox webkit
+      - name: Frontend unit, viewer, workflow, and coverage checks
+        run: npm run --prefix tools/vendor test:coverage
+      - name: Firefox and WebKit page workflows
+        run: npm run --prefix tools/vendor test:workflows -- --project firefox --project webkit
+      - name: Upload browser traces and frontend coverage
+        if: always()
+        uses: actions/upload-artifact@v7
+        with:
+          name: frontend-test-reports
+          path: |
+            tools/vendor/test-results/
+            coverage/js/
+            !coverage/js/raw/**
+          retention-days: 14
diff --git a/.gitignore b/.gitignore
index c29d97c..3a9145d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -205,3 +205,6 @@ cython_debug/
 node_modules/
 test-results/
 playwright-report/
+
+# Combined frontend coverage reports
+coverage/
diff --git a/TESTING.md b/TESTING.md
new file mode 100644
index 0000000..a286611
--- /dev/null
+++ b/TESTING.md
@@ -0,0 +1,83 @@
+# Testing and merge confidence
+
+Routine changes should merge after the required checks pass and the diff is
+reviewed. Add a regression test for each bug; prove it fails before the fix.
+
+## What runs
+
+| Layer | Real components | Replaced boundaries |
+| --- | --- | --- |
+| Python tests | Domain logic, SQLite, API handlers, filesystem checks | ComfyUI host and ML runtimes where needed |
+| JavaScript tests | Frontend modules and controller methods | DOM/network fixtures for focused edge cases |
+| Viewer checks | Production Viewer.js and frontend methods in Chromium desktop/touch | Controlled images and page fixtures |
+| Page workflows | Production HTML, startup, click handlers, HTTP routes, SQLite, PNG files, thumbnails | ComfyUI host services and the tagging model |
+
+Page workflows cover save/edit/reload, duplicate-edit rejection, gallery image
+identity, Tags selection and viewer cleanup, delayed responses, auto-tag review
+and persistence, and infinite scrolling without replacing existing cards.
+They run in Chromium, Firefox, WebKit, and Chromium touch emulation. No GPU,
+model downloads, running ComfyUI instance, or personal configuration is required.
+The server binds to localhost and creates disposable directories and a database;
+its reset endpoint exists only in the test harness.
+
+## Run locally
+
+Use a Python environment containing `requirements-dev.txt` and Node.js 24:
+
+```sh
+python -m unittest discover -s tests -q
+npm ci --prefix tools/vendor --ignore-scripts
+npx --prefix tools/vendor playwright install --with-deps chromium firefox webkit
+npm run --prefix tools/vendor test
+npm run --prefix tools/vendor test:coverage
+npm run --prefix tools/vendor test:workflows -- --project firefox --project webkit
+```
+
+`PM_TEST_PYTHON` selects the Python executable; `PM_TEST_PORT` selects the local
+port (default 8765). Set these environment variables when Python is outside PATH
+or the port is occupied. Test servers are never reused. On unsupported Linux
+distributions, browser system dependencies may need manual installation; CI uses
+Ubuntu. For a quick browser run, use `test:workflows -- --project chromium`.
+
+## Coverage and failures
+
+Python CI enforces 85% combined statement/branch coverage. Frontend coverage merges
+Node V8 unit coverage with Chromium page-workflow coverage through c8. Every
+`web/js/*.js` file appears, including untouched files at zero coverage. The
+controller tests provide V8 filenames so their executed code is counted too.
+
+`tools/vendor/frontend-coverage-baseline.json` holds a floor for every file and
+metric. CI rejects regressions, missing measurements, and new files without a
+reviewed baseline. These floors reflect current coverage, with two percentage
+points of allowance for runtime/timing differences; they do not claim 80% coverage
+of the large controllers. New files need at least 80% line coverage when added via
+the baseline updater. Raise floors with `npm run --prefix tools/vendor
+coverage:update`; it reruns the suites and cannot lower an existing floor.
+Review baseline changes like code changes.
+
+The `viewerjs` check runs on every PR, including backend-only changes. GitHub
+artifacts named `frontend-test-reports` contain HTML coverage, a JSON summary,
+and failure screenshots/traces. Open traces with Playwright's `show-trace` tool.
+
+Live checks remain useful for ComfyUI host compatibility, real inference/GPU or
+model dependency changes, and visual design changes. The automated fixtures do
+not certify those environments or every existing product feature.
+
+## Required merge checks
+
+`.github/branch-protection.json` records the required checks: all nine Python/OS
+combinations, Python coverage, formatting, frontend modules, and `viewerjs`.
+The branch must be current with main, and administrators follow the same checks.
+It does not require an additional human approval.
+
+A repository administrator applies the configuration after the new workflow is
+passing, then verifies it:
+
+```sh
+gh api --method PUT repos/ComfyAssets/ComfyUI_PromptManager/branches/main/protection \
+  --input .github/branch-protection.json
+gh api repos/ComfyAssets/ComfyUI_PromptManager/branches/main/protection/required_status_checks
+```
+
+Update the manifest whenever required job names change. Keep the frontend check
+free of path filters so a required check is never silently skipped.
diff --git a/tests/browser/__init__.py b/tests/browser/__init__.py
new file mode 100644
index 0000000..3bc0d06
--- /dev/null
+++ b/tests/browser/__init__.py
@@ -0,0 +1 @@
+"""Browser workflow fixtures; never imported by production code."""
diff --git a/tests/browser/server.py b/tests/browser/server.py
new file mode 100644
index 0000000..f5f011b
--- /dev/null
+++ b/tests/browser/server.py
@@ -0,0 +1,154 @@
+"""Serve production pages and API routes with disposable state for browser tests."""
+
+import argparse
+import json
+import os
+import shutil
+from pathlib import Path
+import sys
+import tempfile
+import time
+import types
+
+from aiohttp import web
+from PIL import Image
+from PIL.PngImagePlugin import PngInfo
+
+
+class TestModel:
+    default_prompt = "Describe the image"
+    wd14_general_threshold = 0.35
+    wd14_character_threshold = 0.85
+    custom_prompt = ""
+    loaded = None
+
+    def get_models_status(self) -> dict:
+        return {
+            name: {"downloaded": True, "loaded": self.loaded == name}
+            for name in ("gguf", "wd14-vit", "wd14-convnext", "wd14-swinv2")
+        }
+
+    def is_model_loaded(self) -> bool:
+        return self.loaded is not None
+
+    def get_loaded_model_type(self) -> str | None:
+        return self.loaded
+
+    def load_model(self, model_type: str, use_gpu: bool = True) -> bool:
+        self.loaded = model_type
+        return True
+
+    def unload_model(self) -> None:
+        self.loaded = None
+
+    def generate_tags(self, image_path: str, **kwargs: object) -> list[str]:
+        return ["generated", Path(image_path).parent.parent.name]
+
+
+def create_app(root: Path) -> web.Application:
+    os.environ["PROMPT_MANAGER_CONFIG_PATH"] = str(root / "config.json")
+    os.chdir(root)
+    app = web.Application()
+    routes = web.RouteTableDef()
+    server = types.ModuleType("server")
+    server.PromptServer = types.SimpleNamespace(
+        instance=types.SimpleNamespace(app=app, routes=routes)
+    )
+    sys.modules["server"] = server
+    folder_paths = types.ModuleType("folder_paths")
+    folder_paths.base_path = str(root)
+    folder_paths.models_dir = str(root / "models")
+    for name in ("output", "input", "temp", "user"):
+        directory = root / name
+        directory.mkdir()
+        setattr(folder_paths, f"get_{name}_directory", lambda path=directory: str(path))
+    sys.modules["folder_paths"] = folder_paths
+
+    from py.config import GalleryConfig, PromptManagerConfig
+
+    PromptManagerConfig.DEFAULT_DB_PATH = str(root / "browser.db")
+    GalleryConfig.MONITORING_DIRECTORIES = [str(root / "output"), str(root / "input")]
+
+    from py.api import PromptManagerAPI
+    from py import autotag
+    from utils.hashing import generate_prompt_hash
+
+    model = TestModel()
+    autotag.get_autotag_service = lambda: model
+    api = PromptManagerAPI()
+    api.add_routes(routes)
+
+    def seed(extra_images: int = 0) -> None:
+        with api.db.model.get_connection() as conn:
+            for table in ("generated_images", "prompt_tags", "tags", "prompts"):
+                conn.execute(f"DELETE FROM {table}")
+        for name in ("output", "input"):
+            shutil.rmtree(root / name)
+            (root / name).mkdir()
+        for index, (directory, text, tag) in enumerate(
+            [("output", "Cat portrait", "cats"), ("input", "Dog landscape", "dogs")]
+        ):
+            image_path = root / directory / "shared" / "same.png"
+            image_path.parent.mkdir(exist_ok=True)
+            info = PngInfo()
+            info.add_text(
+                "prompt",
+                json.dumps(
+                    {"1": {"class_type": "CLIPTextEncode", "inputs": {"text": text}}}
+                ),
+            )
+            with Image.new("RGB", (64, 64), (index * 255, 64, 128)) as image:
+                image.save(image_path, pnginfo=info)
+            stamp = time.time() - index * 10
+            os.utime(image_path, (stamp, stamp))
+            pid = api.db.save_prompt(
+                text, tags=[tag], prompt_hash=generate_prompt_hash(text)
+            )
+            api.db.link_image_to_prompt(pid, str(image_path))
+            if index == 0:
+                for number in range(extra_images):
+                    extra = root / directory / "bulk" / f"{number:04}.png"
+                    extra.parent.mkdir(exist_ok=True)
+                    shutil.copyfile(image_path, extra)
+                    api.db.link_image_to_prompt(pid, str(extra))
+        api._generate_gallery_thumbnails_sync(api._get_all_output_dirs(), (150, 150))
+        api.invalidate_gallery_cache()
+
+    @routes.post("/__test__/reset")
+    async def reset(request: web.Request) -> web.Response:
+        data = await request.json() if request.can_read_body else {}
+        extra = data.get("extra_images", 0)
+        if (
+            isinstance(extra, bool)
+            or not isinstance(extra, int)
+            or not 0 <= extra <= 200
+        ):
+            raise web.HTTPBadRequest()
+        await api._run_in_executor(seed, extra)
+        return web.json_response({"success": True})
+
+    @routes.get("/api/settings/Comfy.ColorPalette")
+    async def palette(request: web.Request) -> web.Response:
+        return web.json_response("dark")
+
+    async def cleanup(application: web.Application) -> None:
+        api.db.close_all()
+
+    seed()
+    app.on_cleanup.append(cleanup)
+    app.add_routes(routes)
+    return app
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--port", type=int, default=8765)
+    args = parser.parse_args()
+    with tempfile.TemporaryDirectory(prefix="pm-browser-") as directory:
+        web.run_app(
+            create_app(Path(directory).resolve()), host="127.0.0.1", port=args.port
+        )
+
+
+if __name__ == "__main__":
+    main()
diff --git a/tests/browser/workflows.spec.mjs b/tests/browser/workflows.spec.mjs
new file mode 100644
index 0000000..0fbfcff
--- /dev/null
+++ b/tests/browser/workflows.spec.mjs
@@ -0,0 +1,141 @@
+import { startCoverage, saveCoverage } from '../../tools/vendor/browser-coverage.mjs';
+import { test, expect } from '../../tools/vendor/node_modules/@playwright/test/index.mjs';
+
+test.beforeEach(async ({ request, page, browserName }) => {
+    await startCoverage(page, browserName);
+    await expect(await request.post('/__test__/reset')).toBeOK();
+    page.workflowErrors = [];
+    page.on('pageerror', error => page.workflowErrors.push(error.message));
+    page.on('response', response => {
+        if (response.status() >= 500 && response.url().includes('/prompt_manager/')) {
+            page.workflowErrors.push(`${response.status()} ${response.url()}`);
+        }
+    });
+    await page.addInitScript(() => { localStorage.setItem('pm_update_notice_dismissed', '3.2.0'); });
+});
+
+test.afterEach(async ({ page, browserName }) => {
+    await saveCoverage(page, browserName);
+    expect(page.workflowErrors).toEqual([]);
+});
+
+test('actual gallery form saves a prompt that the admin page can edit and reload', async ({ page, request }) => {
+    await page.goto('/prompt_manager/gallery');
+    await page.locator('#addPromptBtn').click();
+    await page.locator('#addPromptText').fill('Browser saved landscape');
+    await page.locator('#addPromptCategory').fill('Browser tests');
+    await page.locator('#addPromptTagInput').fill('browser-tag');
+    await page.locator('#addPromptTagInput').press('Enter');
+    await page.locator('#saveNewPromptBtn').click();
+    await expect(page.locator('#addPromptModal')).toBeHidden();
+    await page.goto('/prompt_manager/admin');
+    const text = page.locator('.prompt-text').filter({ hasText: 'Browser saved landscape' });
+    await expect(text).toBeVisible();
+    const id = await text.getAttribute('data-id');
+    await page.locator(`[data-action="edit"][data-prompt-id="${id}"]`).click();
+    const editor = page.locator(`.prompt-text[data-id="${id}"]`);
+    await editor.fill('Browser edited portrait');
+    await editor.press('Enter');
+    await expect(page.locator('.prompt-text').filter({ hasText: 'Browser edited portrait' })).toBeVisible();
+    await page.reload();
+    await expect(page.locator('.prompt-text').filter({ hasText: 'Browser edited portrait' })).toBeVisible();
+    const saved = await request.post('/prompt_manager/save', { data: { text: 'Browser saved landscape' } });
+    expect((await saved.json()).prompt_id).not.toBe(Number(id));
+});
+
+test('actual gallery review generates and persists tags for the selected root', async ({ page, request }) => {
+    await page.goto('/prompt_manager/gallery');
+    await expect(page.locator('#galleryGrid .image-item')).toHaveCount(2);
+    await page.locator('#autoTagBtn').click();
+    const generated = page.waitForResponse(response => response.url().endsWith('/prompt_manager/autotag/single'));
+    await page.locator('#startReviewBtn').click();
+    const generation = await generated;
+    expect(generation.request().postDataJSON().root_index).toBe(0);
+    await expect(page.locator('#reviewTagsContainer')).toContainText('generated');
+    const result = page.waitForResponse(response => response.url().endsWith('/prompt_manager/autotag/apply'));
+    await page.locator('#applyReviewBtn').click();
+    expect((await (await result).json()).success).toBe(true);
+    const data = await (await request.get('/prompt_manager/recent?limit=20')).json();
+    expect(data.results.find(prompt => prompt.text === 'Cat portrait').tags).toContain('generated');
+    expect(data.results.find(prompt => prompt.text === 'Dog landscape').tags).not.toContain('generated');
+});
+
+test('actual Tags page reloads the selected filter and opens its image viewer', async ({ page }) => {
+    await page.goto('/prompt_manager/admin#/tags');
+    await page.locator('[data-tag-name="cats"]').click();
+    await expect(page.locator('#tagPromptsGrid')).toContainText('Cat portrait');
+    await page.locator('[data-tag-name="dogs"]').click();
+    await expect(page.locator('#tagPromptsGrid')).toContainText('Dog landscape');
+    await expect(page.locator('#tagPromptsGrid')).not.toContainText('Cat portrait');
+    await page.locator('#tagPromptsGrid img').first().click();
+    await expect(page.locator('.viewer-canvas img')).toBeVisible();
+    await page.locator('.viewer-container').getByRole('button', { name: 'Close', exact: true }).click();
+    await expect(page.locator('.viewer-container')).toHaveCount(0);
+});
+
+test('actual gallery serves colliding filenames and shows the matching prompt', async ({ page }) => {
+    await page.goto('/prompt_manager/gallery');
+    await expect(page.locator('#galleryGrid .image-item')).toHaveCount(2);
+    const images = page.locator('#galleryGrid img[data-original]');
+    const first = await images.nth(0).getAttribute('data-original');
+    const second = await images.nth(1).getAttribute('data-original');
+    expect(first).not.toBe(second);
+    await page.locator('#galleryGrid .image-item[data-image-index="0"]').click();
+    await expect(page.locator('#metadata-content')).toContainText('Cat portrait');
+    await page.keyboard.press('ArrowRight');
+    await expect(page.locator('#metadata-content')).toContainText('Dog landscape');
+    await page.keyboard.press('Escape');
+    await expect(page.locator('#metadata-sidebar')).toHaveCount(0);
+});
+
+test('an edit collision is rejected by the backend and the page restores the original text', async ({ page }) => {
+    await page.goto('/prompt_manager/admin');
+    const original = page.locator('.prompt-text').filter({ hasText: 'Cat portrait' });
+    const id = await original.getAttribute('data-id');
+    await page.locator(`[data-action="edit"][data-prompt-id="${id}"]`).click();
+    const editor = page.locator(`.prompt-text[data-id="${id}"]`);
+    await editor.fill('Dog landscape');
+    const rejected = page.waitForResponse(response => response.request().method() === 'PUT' && response.url().endsWith(`/prompts/${id}`));
+    await editor.press('Enter');
+    expect((await rejected).status()).toBe(409);
+    await expect(editor).toHaveText('Cat portrait');
+    await page.reload();
+    await expect(page.locator(`.prompt-text[data-id="${id}"]`)).toHaveText('Cat portrait');
+});
+
+test('a delayed real Tags response cannot replace a newer selection', async ({ page }) => {
+    let release;
+    const delayed = new Promise(resolve => { release = resolve; });
+    let received;
+    const waiting = new Promise(resolve => { received = resolve; });
+    await page.route('**/prompt_manager/tags/cats/prompts?*', async route => {
+        const response = await route.fetch();
+        received();
+        await delayed;
+        await route.fulfill({ response });
+    });
+    await page.goto('/prompt_manager/admin#/tags');
+    await page.locator('[data-tag-name="cats"]').click();
+    await waiting;
+    await page.locator('[data-tag-name="dogs"]').click();
+    await expect(page.locator('#tagPromptsGrid')).toContainText('Dog landscape');
+    const completed = page.waitForResponse(response => response.url().includes('/tags/cats/prompts?'));
+    release();
+    await completed;
+    await expect(page.locator('#tagPromptsGrid')).not.toContainText('Cat portrait');
+});
+
+test('gallery infinite scroll appends a real backend page while retaining existing cards', async ({ page, request }) => {
+    await expect(await request.post('/__test__/reset', { data: { extra_images: 108 } })).toBeOK();
+    await page.goto('/prompt_manager/gallery');
+    await expect(page.locator('#galleryGrid .image-item')).toHaveCount(100);
+    await page.locator('#settingsBtn').click();
+    await page.locator('#infiniteScrollToggle').check();
+    await page.locator('#saveSettingsBtn').click();
+    await expect(page.locator('#settingsModal')).toBeHidden();
+    const first = page.locator('#galleryGrid .image-item').first();
+    await first.evaluate(element => { element.dataset.preserved = 'yes'; });
+    await page.locator('#galleryScroll').evaluate(element => { element.scrollTop = element.scrollHeight; });
+    await expect(page.locator('#galleryGrid .image-item')).toHaveCount(110);
+    await expect(first).toHaveAttribute('data-preserved', 'yes');
+});
diff --git a/tests/js/admin-metadata.test.js b/tests/js/admin-metadata.test.js
index 68abb6d..690fca7 100644
--- a/tests/js/admin-metadata.test.js
+++ b/tests/js/admin-metadata.test.js
@@ -10,7 +10,7 @@ function fixture() {
         getElementById: id => id === 'metadata-content' ? panel : null },
         window: {}, console: { error() {} },
     });
-    const Admin = vm.runInContext(fs.readFileSync(path.join(__dirname, '../../web/js/admin.js'), 'utf8') + '\nPromptAdmin;', context);
+    const Admin = vm.runInContext(fs.readFileSync(path.join(__dirname, '../../web/js/admin.js'), 'utf8') + '\nPromptAdmin;', context, { filename: path.join(__dirname, '../../web/js/admin.js') });
     const manager = Object.create(Admin.prototype);
     manager.extractImageMetadata = url => new Promise((resolve, reject) => requests.set(url, { resolve, reject }));
     manager.updateMetadataSidebar = metadata => { panel.innerHTML = metadata?.imagePath || 'No metadata'; };
diff --git a/tests/js/gallery-metadata.test.js b/tests/js/gallery-metadata.test.js
index 3d4f16e..a55c9db 100644
--- a/tests/js/gallery-metadata.test.js
+++ b/tests/js/gallery-metadata.test.js
@@ -13,7 +13,7 @@ function deferred() {
 function fixture() {
     const context = vm.createContext({ document: { addEventListener() {}, getElementById() {} },
         window: {}, console: { error() {} }, escapeHtml: value => value });
-    const Manager = vm.runInContext(fs.readFileSync(path.join(__dirname, '../../web/js/gallery.js'), 'utf8') + '\nGalleryManager;', context);
+    const Manager = vm.runInContext(fs.readFileSync(path.join(__dirname, '../../web/js/gallery.js'), 'utf8') + '\nGalleryManager;', context, { filename: path.join(__dirname, '../../web/js/gallery.js') });
     const manager = Object.create(Manager.prototype);
     const requests = new Map();
     manager.extractImageMetadata = url => {
diff --git a/tests/js/gallery-performance.test.js b/tests/js/gallery-performance.test.js
index 43d0e96..bfea267 100644
--- a/tests/js/gallery-performance.test.js
+++ b/tests/js/gallery-performance.test.js
@@ -47,7 +47,7 @@ function fixture(count = 2000) {
         ListState: { nextPageState: (state, next) => ({ ...state, ...next }) },
     });
     const source = fs.readFileSync(path.join(__dirname, '../../web/js/gallery.js'), 'utf8');
-    const Manager = vm.runInContext(source + '\nGalleryManager;', context);
+    const Manager = vm.runInContext(source + '\nGalleryManager;', context, { filename: path.join(__dirname, '../../web/js/gallery.js') });
     const manager = Object.create(Manager.prototype);
     Object.assign(manager, { images: Array.from({ length: count }, (_, i) => ({
         filename: `${i}.png`, url: `/original/${i}.png`, thumbnail_url: `/thumb/${i}.jpg`,
diff --git a/tests/js/gallery-review.test.js b/tests/js/gallery-review.test.js
index 96a2600..32e27c1 100644
--- a/tests/js/gallery-review.test.js
+++ b/tests/js/gallery-review.test.js
@@ -24,7 +24,7 @@ function fixture() {
             return request.promise;
         } },
     });
-    const Manager = vm.runInContext(fs.readFileSync(path.join(__dirname, '../../web/js/gallery.js'), 'utf8') + '\nGalleryManager;', context);
+    const Manager = vm.runInContext(fs.readFileSync(path.join(__dirname, '../../web/js/gallery.js'), 'utf8') + '\nGalleryManager;', context, { filename: path.join(__dirname, '../../web/js/gallery.js') });
     const manager = Object.create(Manager.prototype);
     const notifications = [];
     Object.assign(manager, { autoTagState: { reviewImages: [
diff --git a/tests/js/gallery-root-metadata.test.js b/tests/js/gallery-root-metadata.test.js
index cf220c9..733fc35 100644
--- a/tests/js/gallery-root-metadata.test.js
+++ b/tests/js/gallery-root-metadata.test.js
@@ -13,7 +13,7 @@ test('gallery metadata requests retain root identity without including cache par
             return { ok: true, json: async () => ({ success: true, prompt: { text: url } }) };
         } },
     });
-    const Manager = vm.runInContext(fs.readFileSync(path.join(__dirname, '../../web/js/gallery.js'), 'utf8') + '\nGalleryManager;', context);
+    const Manager = vm.runInContext(fs.readFileSync(path.join(__dirname, '../../web/js/gallery.js'), 'utf8') + '\nGalleryManager;', context, { filename: path.join(__dirname, '../../web/js/gallery.js') });
     const manager = Object.create(Manager.prototype);
     manager.extractImageMetadata = async () => null;
     manager.displayMetadata = (metadata, panel) => { panel.prompt = metadata.positivePrompt; };
diff --git a/tests/js/gallery-thumbnails.test.js b/tests/js/gallery-thumbnails.test.js
index 535e945..431beea 100644
--- a/tests/js/gallery-thumbnails.test.js
+++ b/tests/js/gallery-thumbnails.test.js
@@ -23,7 +23,7 @@ function fixture(status, settings = {}) {
             total: 10000, images: Array.from({ length: 50 }, () => ({ thumbnail_url: null })),
         }) }) },
     });
-    const Manager = vm.runInContext(fs.readFileSync(path.join(__dirname, '../../web/js/gallery.js'), 'utf8') + '\nGalleryManager;', context);
+    const Manager = vm.runInContext(fs.readFileSync(path.join(__dirname, '../../web/js/gallery.js'), 'utf8') + '\nGalleryManager;', context, { filename: path.join(__dirname, '../../web/js/gallery.js') });
     const manager = Object.create(Manager.prototype);
     Object.assign(manager, { getSettings: () => ({ checkThumbnailsAtStartup: true, ...settings }),
         api: { get: async url => { requests.push(url); return status; } },
diff --git a/tests/js/tags-prompts-race.test.js b/tests/js/tags-prompts-race.test.js
index b06ce68..d227ae0 100644
--- a/tests/js/tags-prompts-race.test.js
+++ b/tests/js/tags-prompts-race.test.js
@@ -10,7 +10,7 @@ function fixture() {
         requestAnimationFrame() {}, document: { getElementById: id => id === 'tagPromptsGrid' ? grid : null,
             querySelector: () => null, createElement: () => ({ appendChild() {} }) },
     });
-    const Manager = vm.runInContext(fs.readFileSync(path.join(__dirname, '../../web/js/tags-page.js'), 'utf8') + '\nTagsPageManager;', context);
+    const Manager = vm.runInContext(fs.readFileSync(path.join(__dirname, '../../web/js/tags-page.js'), 'utf8') + '\nTagsPageManager;', context, { filename: path.join(__dirname, '../../web/js/tags-page.js') });
     const manager = Object.create(Manager.prototype);
     Object.assign(manager, { selectedTags: ['cats'], filterMode: 'and', promptLimit: 20,
         promptOffset: 0, isLoadingPrompts: false, prompts: [], hasMorePrompts: false,
diff --git a/tests/vendor/frontend-coverage.test.mjs b/tests/vendor/frontend-coverage.test.mjs
new file mode 100644
index 0000000..ba1845d
--- /dev/null
+++ b/tests/vendor/frontend-coverage.test.mjs
@@ -0,0 +1,22 @@
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import { join } from 'node:path';
+const sourceRoot = join(process.cwd(), 'web/js');
+import { checkCoverage } from '../../tools/vendor/frontend-coverage.mjs';
+const metrics = value => Object.fromEntries(['lines', 'branches', 'functions', 'statements'].map(key => [key, { pct: value }]));
+const summary = { total: metrics(90), [join(sourceRoot, 'a.js')]: metrics(85) };
+const baseline = { 'a.js': { lines: 80, branches: 80, functions: 80, statements: 80 } };
+test('coverage gate accepts measured files at or above their reviewed floor', () => {
+    assert.deepEqual(checkCoverage(summary, baseline, sourceRoot, ['a.js']), []);
+});
+test('coverage gate rejects a regression even when the aggregate percentage is high', () => {
+    assert.match(checkCoverage({ ...summary, [join(sourceRoot, 'a.js')]: metrics(70) }, baseline, sourceRoot, ['a.js']).join('\n'), /a.js.*lines/);
+});
+test('coverage gate rejects absent source files and unreviewed new files', () => {
+    assert.match(checkCoverage({ total: metrics(100) }, baseline, sourceRoot, ['a.js']).join('\n'), /missing.*a.js/i);
+    assert.match(checkCoverage(summary, baseline, sourceRoot, ['a.js', 'new.js']).join('\n'), /baseline.*new.js/i);
+});
+test('coverage gate rejects invalid baselines and missing metrics', () => {
+    assert.throws(() => checkCoverage(summary, { 'a.js': { lines: -1 } }, sourceRoot, ['a.js']), /baseline/i);
+    assert.match(checkCoverage({ total: metrics(100), [join(sourceRoot, 'a.js')]: {} }, baseline, sourceRoot, ['a.js']).join('\n'), /lines/);
+});
diff --git a/tools/vendor/README.md b/tools/vendor/README.md
index 66f94f5..22cd817 100644
--- a/tools/vendor/README.md
+++ b/tools/vendor/README.md
@@ -28,6 +28,10 @@ version banners must agree. The lockfile records npm's archive integrity;
 `provenance.json` records the upstream source, package integrity, and SHA-256 of
 each copied file. A normal `npm ci --ignore-scripts` verifies archive integrity.
 
+Full-page workflows, frontend coverage gates, and required merge checks are
+documented in [TESTING.md](../../TESTING.md). The `viewerjs` CI check runs both
+the fixture tests above and the real-page workflows on every PR.
+
 ## Update
 
 ```sh
diff --git a/tools/vendor/browser-coverage.mjs b/tools/vendor/browser-coverage.mjs
new file mode 100644
index 0000000..222b2da
--- /dev/null
+++ b/tools/vendor/browser-coverage.mjs
@@ -0,0 +1,22 @@
+import { mkdirSync, writeFileSync } from 'node:fs';
+import { join } from 'node:path';
+import { pathToFileURL } from 'node:url';
+import { randomUUID } from 'node:crypto';
+import { repositoryRoot } from './vendor-viewerjs.mjs';
+
+export async function startCoverage(page, browserName) {
+    if (process.env.PM_JS_COVERAGE && browserName === 'chromium') {
+        await page.coverage.startJSCoverage({ resetOnNavigation: false });
+    }
+}
+export async function saveCoverage(page, browserName) {
+    if (!process.env.PM_JS_COVERAGE || browserName !== 'chromium') return;
+    const entries = await page.coverage.stopJSCoverage();
+    const result = [];
+    for (const entry of entries) {
+        const match = entry.url.match(/\/prompt_manager\/js\/([a-z0-9-]+\.js)(?:\?.*)?$/i);
+        if (match) result.push({ ...entry, url: pathToFileURL(join(repositoryRoot, 'web/js', match[1])).href });
+    }
+    mkdirSync(process.env.PM_JS_COVERAGE, { recursive: true });
+    writeFileSync(join(process.env.PM_JS_COVERAGE, `browser-${randomUUID()}.json`), JSON.stringify({ result }));
+}
diff --git a/tools/vendor/frontend-coverage-baseline.json b/tools/vendor/frontend-coverage-baseline.json
new file mode 100644
index 0000000..9e5a107
--- /dev/null
+++ b/tools/vendor/frontend-coverage-baseline.json
@@ -0,0 +1,104 @@
+{
+  "admin.js": {
+    "lines": 24,
+    "branches": 53,
+    "functions": 20,
+    "statements": 24
+  },
+  "api-client.js": {
+    "lines": 98,
+    "branches": 94,
+    "functions": 98,
+    "statements": 98
+  },
+  "comfy-metadata.js": {
+    "lines": 97,
+    "branches": 90,
+    "functions": 98,
+    "statements": 97
+  },
+  "data-actions.js": {
+    "lines": 98,
+    "branches": 98,
+    "functions": 98,
+    "statements": 98
+  },
+  "gallery-settings.js": {
+    "lines": 98,
+    "branches": 90,
+    "functions": 98,
+    "statements": 98
+  },
+  "gallery.js": {
+    "lines": 39,
+    "branches": 63,
+    "functions": 43,
+    "statements": 39
+  },
+  "html-escape.js": {
+    "lines": 98,
+    "branches": 98,
+    "functions": 98,
+    "statements": 98
+  },
+  "image-helpers.js": {
+    "lines": 96,
+    "branches": 91,
+    "functions": 98,
+    "statements": 96
+  },
+  "list-state.js": {
+    "lines": 98,
+    "branches": 92,
+    "functions": 98,
+    "statements": 98
+  },
+  "png-metadata.js": {
+    "lines": 98,
+    "branches": 90,
+    "functions": 98,
+    "statements": 98
+  },
+  "prompt-list-sort.js": {
+    "lines": 98,
+    "branches": 98,
+    "functions": 98,
+    "statements": 98
+  },
+  "scan-progress.js": {
+    "lines": 97,
+    "branches": 91,
+    "functions": 98,
+    "statements": 97
+  },
+  "sse-stream.js": {
+    "lines": 98,
+    "branches": 90,
+    "functions": 98,
+    "statements": 98
+  },
+  "tag-autocomplete.js": {
+    "lines": 98,
+    "branches": 94,
+    "functions": 98,
+    "statements": 98
+  },
+  "tags-page.js": {
+    "lines": 57,
+    "branches": 48,
+    "functions": 56,
+    "statements": 57
+  },
+  "theme-bridge.js": {
+    "lines": 90,
+    "branches": 53,
+    "functions": 98,
+    "statements": 90
+  },
+  "view-router.js": {
+    "lines": 98,
+    "branches": 98,
+    "functions": 98,
+    "statements": 98
+  }
+}
diff --git a/tools/vendor/frontend-coverage.mjs b/tools/vendor/frontend-coverage.mjs
new file mode 100644
index 0000000..e3ceae4
--- /dev/null
+++ b/tools/vendor/frontend-coverage.mjs
@@ -0,0 +1,76 @@
+import { readFileSync, readdirSync, mkdirSync, rmSync, writeFileSync } from 'node:fs';
+import { dirname, join, relative } from 'node:path';
+import { fileURLToPath, pathToFileURL } from 'node:url';
+import { spawnSync } from 'node:child_process';
+import { repositoryRoot } from './vendor-viewerjs.mjs';
+
+const metrics = ['lines', 'branches', 'functions', 'statements'];
+export function checkCoverage(summary, baseline, sourceRoot, files) {
+    const failures = [];
+    for (const file of files) {
+        const floor = baseline[file];
+        if (!floor) { failures.push(`Missing baseline for ${file}`); continue; }
+        const measured = summary[join(sourceRoot, file)];
+        if (!measured) { failures.push(`Missing coverage for ${file}`); continue; }
+        for (const metric of metrics) {
+            if (!Number.isFinite(floor[metric]) || floor[metric] < 0 || floor[metric] > 100) {
+                throw new Error(`Invalid baseline for ${file}: ${metric}`);
+            }
+            if (!Number.isFinite(measured[metric]?.pct) || measured[metric].pct < floor[metric]) {
+                failures.push(`${file} ${metric}: ${measured[metric]?.pct ?? 'missing'} < ${floor[metric]}`);
+            }
+        }
+    }
+    return failures;
+}
+
+function run(args, env = {}) {
+    const result = spawnSync(process.execPath, args, { cwd: repositoryRoot, stdio: 'inherit',
+        env: { ...process.env, ...env } });
+    if (result.status !== 0) throw new Error(`Command failed (${result.status}): ${args.join(' ')}`);
+}
+
+async function main() {
+    const tools = dirname(fileURLToPath(import.meta.url));
+    const reportRoot = join(repositoryRoot, 'coverage/js');
+    const raw = join(reportRoot, 'raw');
+    const sourceRoot = join(repositoryRoot, 'web/js');
+    const files = readdirSync(sourceRoot).filter(file => file.endsWith('.js')).sort();
+    rmSync(reportRoot, { recursive: true, force: true });
+    mkdirSync(raw, { recursive: true });
+    const tests = readdirSync(join(repositoryRoot, 'tests/js')).filter(file => file.endsWith('.test.js')).map(file => `tests/js/${file}`);
+    run(['--test', ...tests], { NODE_V8_COVERAGE: raw });
+    const playwright = join(tools, 'node_modules/@playwright/test/cli.js');
+    run([playwright, 'test', '--config', join(tools, 'playwright.config.mjs')]);
+    run([playwright, 'test', '--config', join(tools, 'playwright.workflows.config.mjs'),
+        '--project', 'chromium', '--project', 'touch'], { PM_JS_COVERAGE: raw });
+    run([join(tools, 'node_modules/c8/bin/c8.js'), 'report', '--all', '--src', sourceRoot,
+        '--include', 'web/js/*.js', '--temp-directory', raw, '--reports-dir', reportRoot,
+        '--reporter', 'text', '--reporter', 'json-summary', '--reporter', 'html']);
+    const summary = JSON.parse(readFileSync(join(reportRoot, 'coverage-summary.json'), 'utf8'));
+    const baselinePath = join(tools, 'frontend-coverage-baseline.json');
+    if (process.argv.includes('--update-baseline')) {
+        const previous = JSON.parse(readFileSync(baselinePath, 'utf8'));
+        const failures = checkCoverage(summary, previous, sourceRoot, files.filter(file => previous[file]));
+        if (failures.length) throw new Error(`Baseline updates cannot lower coverage:\n${failures.join('\n')}`);
+        const next = Object.fromEntries(files.map(file => {
+            const measured = summary[join(sourceRoot, file)];
+            if (!measured || metrics.some(metric => !Number.isFinite(measured[metric]?.pct))) {
+                throw new Error(`Missing coverage for ${file}`);
+            }
+            if (Object.keys(previous).length && !previous[file] && measured.lines.pct < 80) {
+                throw new Error(`New frontend files need at least 80% line coverage: ${file}`);
+            }
+            return [file, Object.fromEntries(metrics.map(metric => [metric, Math.max(previous[file]?.[metric] || 0, Math.floor(measured[metric].pct) - 2, 0)]))];
+        }));
+        writeFileSync(baselinePath, JSON.stringify(next, null, 2) + '\n');
+    } else {
+        const baseline = JSON.parse(readFileSync(baselinePath, 'utf8'));
+        const failures = checkCoverage(summary, baseline, sourceRoot, files);
+        if (failures.length) throw new Error(`Frontend coverage regressed:\n${failures.join('\n')}`);
+    }
+    console.log(`Frontend coverage passed for ${files.length} files. Report: ${relative(repositoryRoot, reportRoot)}/index.html`);
+}
+if (process.argv[1] && import.meta.url === pathToFileURL(process.argv[1]).href) {
+    main().catch(error => { console.error(error.message); process.exitCode = 1; });
+}
diff --git a/tools/vendor/package-lock.json b/tools/vendor/package-lock.json
index 8cba944..2567e97 100644
--- a/tools/vendor/package-lock.json
+++ b/tools/vendor/package-lock.json
@@ -9,9 +9,58 @@
       "version": "1.0.0",
       "devDependencies": {
         "@playwright/test": "1.64.1",
+        "c8": "12.0.0",
         "viewerjs": "1.15.2"
       }
     },
+    "node_modules/@bcoe/v8-coverage": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/@bcoe/v8-coverage/-/v8-coverage-1.0.2.tgz",
+      "integrity": "sha512-6zABk/ECA/QYSCQ1NGiVwwbQerUCZ+TQbp64Q3AgmfNvurHH0j8TtXa1qbShXA6qqkpAj4V5W8pP6mLe1mcMqA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@istanbuljs/schema": {
+      "version": "0.1.6",
+      "resolved": "https://registry.npmjs.org/@istanbuljs/schema/-/schema-0.1.6.tgz",
+      "integrity": "sha512-+Sg6GCR/wy1oSmQDFq4LQDAhm3ETKnorxN+y5nbLULOR3P0c14f2Wurzj3/xqPXtasLFfHd5iRFQ7AJt4KH2cw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/@jridgewell/resolve-uri": {
+      "version": "3.1.2",
+      "resolved": "https://registry.npmjs.org/@jridgewell/resolve-uri/-/resolve-uri-3.1.2.tgz",
+      "integrity": "sha512-bRISgCIjP20/tbWSPWMEi54QVPRZExkuD9lJL+UIxUKtwVJA8wW1Trb1jMs1RFXo1CBTNZ/5hpC9QvmKWdopKw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=6.0.0"
+      }
+    },
+    "node_modules/@jridgewell/sourcemap-codec": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.6.0.tgz",
+      "integrity": "sha512-T7jf+5zgsZHwNJ4lvQ7/aezbyk0nNX+zJVWpmHA7VYsEx7a7qr5Rg5IbtJFqkgze5Y2sruq1RUY8Q837Od7iFw==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@jridgewell/trace-mapping": {
+      "version": "0.3.31",
+      "resolved": "https://registry.npmjs.org/@jridgewell/trace-mapping/-/trace-mapping-0.3.31.tgz",
+      "integrity": "sha512-zzNR+SdQSDJzc8joaeP8QQoCQr8NuYx2dIIytl1QeBEZHJ9uW6hebsrYgbz8hJwUQao3TWCMtmfV8Nu1twOLAw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@jridgewell/resolve-uri": "^3.1.0",
+        "@jridgewell/sourcemap-codec": "^1.4.14"
+      }
+    },
     "node_modules/@playwright/test": {
       "version": "1.64.1",
       "resolved": "https://registry.npmjs.org/@playwright/test/-/test-1.64.1.tgz",
@@ -28,6 +77,443 @@
         "node": ">=20"
       }
     },
+    "node_modules/@types/istanbul-lib-coverage": {
+      "version": "2.0.6",
+      "resolved": "https://registry.npmjs.org/@types/istanbul-lib-coverage/-/istanbul-lib-coverage-2.0.6.tgz",
+      "integrity": "sha512-2QF/t/auWm0lsy8XtKVPG19v3sSOQlJe/YHZgfjb/KBBHOGSV+J2q/S671rcq9uTBrLAXmZpqJiaQbMT+zNU1w==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/ansi-regex": {
+      "version": "6.4.0",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-6.4.0.tgz",
+      "integrity": "sha512-KzTVk2tCWAHtYrvvvaP8bJKJq2pVinhLcGEQdtLIYPbmNGNyYe8QwNaTUYQp2J7/vIsUKt5QCqAfUkYyG9DkOw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-regex?sponsor=1"
+      }
+    },
+    "node_modules/ansi-styles": {
+      "version": "6.2.3",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-6.2.3.tgz",
+      "integrity": "sha512-4Dj6M28JB+oAH8kFkTLUo+a2jwOFkuqb3yucU0CANcRRUbxS0cP0nZYCGjcc3BNXwRIsUVmDGgzawme7zvJHvg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
+      }
+    },
+    "node_modules/balanced-match": {
+      "version": "4.0.4",
+      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-4.0.4.tgz",
+      "integrity": "sha512-BLrgEcRTwX2o6gGxGOCNyMvGSp35YofuYzw9h1IMTRmKqttAZZVU67bdb9Pr2vUHA8+j3i2tJfjO6C6+4myGTA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "18 || 20 || >=22"
+      }
+    },
+    "node_modules/brace-expansion": {
+      "version": "5.0.12",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-5.0.12.tgz",
+      "integrity": "sha512-YovQ3rzhaLMIrDjNDMkNS01tea93qhEhG5xy8f6+R0l+dw3Ki+5sCoIoI942iuLZTHWogWktgwVDhU09iNEimQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "balanced-match": "^4.0.2"
+      },
+      "engines": {
+        "node": "20 || >=22"
+      }
+    },
+    "node_modules/c8": {
+      "version": "12.0.0",
+      "resolved": "https://registry.npmjs.org/c8/-/c8-12.0.0.tgz",
+      "integrity": "sha512-4zpJvrd1nKWutnnKC2pXkFmb6iM1l+ffN//o1CzlTNwW7GSOs9a1xrLqkC48nU8oEkjmPZLPiwMsIaOvoF4Pqg==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "@bcoe/v8-coverage": "^1.0.1",
+        "@istanbuljs/schema": "^0.1.3",
+        "find-up": "^5.0.0",
+        "foreground-child": "^3.1.1",
+        "istanbul-lib-coverage": "^3.2.0",
+        "istanbul-lib-report": "^3.0.1",
+        "istanbul-reports": "^3.1.6",
+        "test-exclude": "^8.0.0",
+        "v8-to-istanbul": "^9.0.0",
+        "yargs": "^18.0.0",
+        "yargs-parser": "^21.1.1"
+      },
+      "bin": {
+        "c8": "bin/c8.js"
+      },
+      "engines": {
+        "node": "^20.19.0 || ^22.12.0 || >=23"
+      },
+      "peerDependencies": {
+        "monocart-coverage-reports": "^2"
+      },
+      "peerDependenciesMeta": {
+        "monocart-coverage-reports": {
+          "optional": true
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+      "resolved": "https://registry.npmjs.org/v8-to-istanbul/-/v8-to-istanbul-9.3.0.tgz",
+      "integrity": "sha512-kiGUalWN+rgBJ/1OHZsBtU4rXZOfj/7rKQxULKlIzwzQSvMJUUNgPwJEEh7gU6xEVxC0ahoOBvN2YI8GH6FNgA==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "@jridgewell/trace-mapping": "^0.3.12",
+        "@types/istanbul-lib-coverage": "^2.0.1",
+        "convert-source-map": "^2.0.0"
+      },
+      "engines": {
+        "node": ">=10.12.0"
+      }
+    },
     "node_modules/viewerjs": {
       "version": "1.15.2",
       "resolved": "https://registry.npmjs.org/viewerjs/-/viewerjs-1.15.2.tgz",
       "integrity": "sha512-CYEqSFfPUSnmn1PjrhYxXOScaUC7n8+NpSqI+MrOSM8wcKPe35MlwQYwksuD5rjFkYv/ePmY5NsUa51uRNN2jA==",
       "dev": true,
       "license": "MIT"
+    },
+    "node_modules/which": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
+      "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "isexe": "^2.0.0"
+      },
+      "bin": {
+        "node-which": "bin/node-which"
+      },
+      "engines": {
+        "node": ">= 8"
+      }
+    },
+    "node_modules/wrap-ansi": {
+      "version": "9.0.2",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-9.0.2.tgz",
+      "integrity": "sha512-42AtmgqjV+X1VpdOfyTGOYRi0/zsoLqtXQckTmqTeybT+BDIbM/Guxo7x3pE2vtpr1ok6xRqM9OpBe+Jyoqyww==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ansi-styles": "^6.2.1",
+        "string-width": "^7.0.0",
+        "strip-ansi": "^7.1.0"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/wrap-ansi?sponsor=1"
+      }
+    },
+    "node_modules/wrap-ansi/node_modules/string-width": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-7.2.0.tgz",
+      "integrity": "sha512-tsaTIkKW9b4N+AEj+SVA+WhJzV7/zMhcSu78mLKWSk7cXMOSHsBKFWUs0fWwq8QyK3MgJBQRX6Gbi4kYbdvGkQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "emoji-regex": "^10.3.0",
+        "get-east-asian-width": "^1.0.0",
+        "strip-ansi": "^7.1.0"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/y18n": {
+      "version": "5.0.8",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.8.tgz",
+      "integrity": "sha512-0pfFzegeDWJHJIAmTLRP2DwHjdF5s7jo9tuztdQxAhINCdvS+3nGINqPd00AphqJR/0LhANUS6/+7SCb98YOfA==",
+      "dev": true,
+      "license": "ISC",
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "node_modules/yargs": {
+      "version": "18.2.0",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-18.2.0.tgz",
+      "integrity": "sha512-9OpKOLeaoNFecEp7P6iYbzze/5CqWoH7N3SMs/6y1XF4nMvFMspEGZzJ6uFi9MmQwXhyzqYoSEKO3tvA3Z/o2w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "cliui": "^9.0.1",
+        "escalade": "^3.1.1",
+        "get-caller-file": "^2.0.5",
+        "string-width": "^8.2.1",
+        "y18n": "^5.0.5",
+        "yargs-parser": "^22.0.0"
+      },
+      "engines": {
+        "node": "^20.19.0 || ^22.12.0 || >=23"
+      }
+    },
+    "node_modules/yargs-parser": {
+      "version": "21.1.1",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-21.1.1.tgz",
+      "integrity": "sha512-tVpsJW7DdjecAiFpbIB1e3qxIQsE6NoPc5/eTdrbbIC4h0LVsWhnoa3g+m2HclBIujHzsxZ4VJVA+GUuc2/LBw==",
+      "dev": true,
+      "license": "ISC",
+      "engines": {
+        "node": ">=12"
+      }
+    },
+    "node_modules/yargs/node_modules/yargs-parser": {
+      "version": "22.0.0",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-22.0.0.tgz",
+      "integrity": "sha512-rwu/ClNdSMpkSrUb+d6BRsSkLUq1fmfsY6TOpYzTwvwkg1/NRG85KBy3kq++A8LKQwX6lsu+aWad+2khvuXrqw==",
+      "dev": true,
+      "license": "ISC",
+      "engines": {
+        "node": "^20.19.0 || ^22.12.0 || >=23"
+      }
+    },
+    "node_modules/yocto-queue": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz",
+      "integrity": "sha512-rVksvsnNCdJ/ohGc6xgPwyN8eheCxsiLM8mxuE/t/mOVqJewPuO1miLpTHQiRgTKCLexL4MeAFVagts7HmNZ2Q==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
     }
   }
 }
diff --git a/tools/vendor/package.json b/tools/vendor/package.json
index 42e47b9..13acd0e 100644
--- a/tools/vendor/package.json
+++ b/tools/vendor/package.json
@@ -8,10 +8,14 @@
     "check": "node vendor-viewerjs.mjs --check",
     "update": "node update-viewerjs.mjs",
     "test": "node --test ../../tests/vendor/*.test.mjs",
-    "test:browser": "playwright test --config playwright.config.mjs"
+    "test:browser": "playwright test --config playwright.config.mjs",
+    "test:workflows": "playwright test --config playwright.workflows.config.mjs",
+    "test:coverage": "node frontend-coverage.mjs",
+    "coverage:update": "node frontend-coverage.mjs --update-baseline"
   },
   "devDependencies": {
     "@playwright/test": "1.64.1",
+    "c8": "12.0.0",
     "viewerjs": "1.15.2"
   }
 }
diff --git a/tools/vendor/playwright.config.mjs b/tools/vendor/playwright.config.mjs
index 4e26aed..5d291a7 100644
--- a/tools/vendor/playwright.config.mjs
+++ b/tools/vendor/playwright.config.mjs
@@ -2,6 +2,7 @@ import { defineConfig } from '@playwright/test';
 
 export default defineConfig({
     testDir: './tests',
+    outputDir: './test-results/viewer',
     testMatch: '*.spec.mjs',
     fullyParallel: true,
     workers: 2,
diff --git a/tools/vendor/playwright.workflows.config.mjs b/tools/vendor/playwright.workflows.config.mjs
new file mode 100644
index 0000000..313ca8e
--- /dev/null
+++ b/tools/vendor/playwright.workflows.config.mjs
@@ -0,0 +1,27 @@
+import { defineConfig, devices } from '@playwright/test';
+import { repositoryRoot } from './vendor-viewerjs.mjs';
+const port = Number(process.env.PM_TEST_PORT || 8765);
+export default defineConfig({
+    testDir: '../../tests/browser',
+    outputDir: './test-results/workflows',
+    testMatch: '*.spec.mjs',
+    workers: 1,
+    fullyParallel: false,
+    forbidOnly: Boolean(process.env.CI),
+    retries: 0,
+    reporter: 'list',
+    use: { baseURL: `http://127.0.0.1:${port}`, trace: 'retain-on-failure', screenshot: 'only-on-failure' },
+    webServer: {
+        command: `node tools/vendor/start-browser-server.mjs --port ${port}`,
+        cwd: repositoryRoot,
+        url: `http://127.0.0.1:${port}/prompt_manager/test`,
+        reuseExistingServer: false,
+        gracefulShutdown: { signal: 'SIGTERM', timeout: 5000 },
+    },
+    projects: [
+        { name: 'chromium', use: { browserName: 'chromium' } },
+        { name: 'firefox', use: { browserName: 'firefox' } },
+        { name: 'webkit', use: { browserName: 'webkit' } },
+        { name: 'touch', use: { ...devices['Pixel 7'], browserName: 'chromium' } },
+    ],
+});
diff --git a/tools/vendor/start-browser-server.mjs b/tools/vendor/start-browser-server.mjs
new file mode 100644
index 0000000..f41dc62
--- /dev/null
+++ b/tools/vendor/start-browser-server.mjs
@@ -0,0 +1,8 @@
+import { spawn } from 'node:child_process';
+const child = spawn(process.env.PM_TEST_PYTHON || 'python',
+    ['-m', 'tests.browser.server', ...process.argv.slice(2)], { stdio: 'inherit' });
+child.on('error', error => { console.error(error.message); process.exitCode = 1; });
+child.on('exit', code => { process.exitCode = code ?? 1; });
+for (const signal of ['SIGTERM', 'SIGINT']) {
+    process.once(signal, () => child.kill(signal));
+}