docs: add product feedback feature plan

docs/TASKS/product-feedback/004-frontend-feedback-submission.md

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+# Task: Frontend feedback submission flow
+
+## Goal
+
+Add the global authenticated Feedback button, submission dialog, viewport capture, and annotation flow.
+
+## Feature Spec
+
+- `docs/FEATURES/product-feedback.md`
+
+## Scope
+
+- Add feature-owned frontend code under `frontend/src/features/feedback/`.
+- Add a small floating Feedback button to the authenticated app shell on every `/app/*` page.
+- Keep the button visible on feedback-related pages too.
+- Add a feedback submission dialog with:
+  - required type: `Bug`, `Suggestion`, `Request`
+  - required plain-text description
+  - optional capture flow
+  - dirty-close warning that discards unsent feedback if confirmed
+- Capture only the current app viewport when the user explicitly clicks `Capture screen`.
+- Add screenshot annotation support:
+  - crop
+  - arrows
+  - circles or ellipses
+  - lines
+  - freehand marks
+  - text labels
+  - undo
+  - clear/reset
+- Export annotated screenshots as compressed PNG or JPEG.
+- Submit feedback metadata, route context, browser metadata, viewport size, and optional screenshot to the backend.
+- If capture fails, show a friendly error and allow text-only submission.
+- Use established libraries for capture/annotation rather than custom screenshot infrastructure.
+- Add English and French locale strings for the submission flow.
+
+## Likely Files
+
+- `frontend/package.json`
+- `frontend/src/layouts/**`
+- `frontend/src/features/feedback/**`
+- `frontend/src/plugins/api.js`
+- `frontend/src/locales/en.json`
+- `frontend/src/locales/fr.json`
+
+## Notes
+
+- Runtime configuration must continue to flow through `frontend/src/config.js` if new configuration is needed.
+- Keep the flow non-intrusive and app-shell scoped.
+- Avoid landing-page or marketing-style UI.
+
+## Validation
+
+```bash
+cd frontend
+npm run build
+```
+
+## Done When
+
+- [ ] Authenticated users see a floating Feedback button on every app page.
+- [ ] Users can submit required type and description.
+- [ ] Users can optionally capture and annotate the app viewport.
+- [ ] Capture failures do not block text-only feedback.
+- [ ] Dirty dialog close warns before discarding unsent feedback.
+- [ ] UI strings exist in English and French.
+- [ ] Frontend build passes.