Add calendar integrations and collaboration updates

docs/TASKS/content/004-content-production-collaboration-panel.md

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+# Task: Add content production collaboration panel
+
+## Feature
+
+`docs/FEATURES/production-workflow.md`
+
+## Goal
+
+Make the content detail page expose the existing production collaboration data that is already loaded by the frontend store: comments, content revisions, linked assets, asset revisions, and workflow activity.
+
+## Scope
+
+- Add a compact production collaboration panel to `ContentItemDetailView`.
+- Keep comment creation and resolution available.
+- Show content revision history with change summaries.
+- Show linked assets and their revisions.
+- Add UI for linking a Google Drive asset and adding a new asset revision.
+- Show content-scoped notification activity as a read-only production activity feed.
+
+## Likely Files
+
+- `frontend/src/features/content/views/ContentItemDetailView.vue`
+- `frontend/src/features/content/stores/contentItemDetailStore.js`
+
+## Out Of Scope
+
+- Backend schema changes.
+- Native file uploads.
+- Mention parsing.
+- Approval comment visibility rules.
+- Reworking content variant persistence.
+
+## Validation
+
+```bash
+cd frontend
+npm run build
+```
+
+## Acceptance Criteria
+
+- [x] Comments, revisions, assets, and activity are visible from the content detail page.
+- [x] Users can post comments from the production panel.
+- [x] Users can link a Google Drive asset to a content item.
+- [x] Users can add a new revision URL/reference to an existing asset.
+- [x] Existing create/edit content and approval controls remain available.