docs: add product feedback feature plan

docs/TASKS/product-feedback/007-feedback-notification-ui-integration.md

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+# Task: Feedback notification UI integration
+
+## Goal
+
+Integrate feedback notifications into the existing notification bell and route navigation.
+
+## Feature Spec
+
+- `docs/FEATURES/product-feedback.md`
+
+## Scope
+
+- Extend frontend notification display to support feedback event types.
+- Clicking a feedback notification should open:
+  - `/app/my-feedback/:id` for reporters
+  - `/app/feedback/:id` for developers when appropriate
+- Mark feedback notifications as read using existing notification behavior.
+- Ensure feedback notification labels are localized in English and French.
+- Ensure My Feedback unread indicators stay consistent with notification read state or the backend unread model.
+- Preserve existing content/comment/approval notification behavior.
+
+## Likely Files
+
+- `frontend/src/layouts/main/AppSidebar.vue`
+- `frontend/src/features/notifications/**`
+- `frontend/src/features/feedback/**`
+- `frontend/src/locales/en.json`
+- `frontend/src/locales/fr.json`
+
+## Notes
+
+- This task depends on backend feedback notification payloads from `003-feedback-comments-activity-notifications.md`.
+- Do not introduce email notification behavior.
+
+## Validation
+
+```bash
+cd frontend
+npm run build
+```
+
+## Done When
+
+- [ ] Feedback notifications appear in the existing notification bell.
+- [ ] Feedback notification clicks navigate to the correct detail page.
+- [ ] Feedback notifications can be marked read.
+- [ ] My Feedback unread indicators reflect unread feedback activity.
+- [ ] Existing notification flows still work.
+- [ ] UI strings exist in English and French.
+- [ ] Frontend build passes.