Prepare 4.0.5 Firefox update and Shorts fixes

Add Firefox data consent, repair contributor sign-in, and introduce optional Hide clutter buttons. Harden video navigation, voting, and action layouts with shared browser regression coverage and reproducible release packaging.

.github/workflows/build.yaml

@@ -13,6 +13,8 @@ on:
       - ".babelrc"
       - ".gitattributes"
       - ".nvmrc"
+      - "extension-build-receipt*.js"
+      - "userscript-build-receipt*.js"
       - "jest.config.js"
       - "package.json"
       - "package-lock.json"
@@ -30,6 +32,8 @@ on:
       - ".babelrc"
       - ".gitattributes"
       - ".nvmrc"
+      - "extension-build-receipt*.js"
+      - "userscript-build-receipt*.js"
       - "jest.config.js"
       - "package.json"
       - "package-lock.json"
@@ -59,6 +63,9 @@ jobs:
       - name: Build extension
         run: npm run build
 
+      - name: Check generated extension artifact
+        run: npm run check:extension-artifact
+
       - name: Build userscript
         run: npm run build:userscript
 
@@ -71,8 +78,11 @@ jobs:
       - name: Run generated-artifact browser tests
         run: npm run test:e2e:artifacts
 
+      - name: Run extension browser tests
+        run: npm run test:e2e:extension:run
+
       - name: Run userscript browser tests
-        run: npx playwright test --config playwright.userscript.config.js
+        run: npm run test:e2e:userscript:run
 
       - name: Upload Chrome artifact
         uses: actions/upload-artifact@v4
@@ -96,7 +106,7 @@ jobs:
         if: failure()
         uses: actions/upload-artifact@v4
         with:
-          name: userscript-playwright-failure
+          name: playwright-browser-failures
           path: |
             ./test-results
             ./playwright-report