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.

docs/TASKS/content/005-scope-content-editor-channels.md

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+# Task: Scope content editor channels to item workspace
+
+## Feature
+
+`docs/FEATURES/channels.md`
+
+## Goal
+
+Prevent content item channel placements from mixing channels across workspaces when the app is viewed in an all-workspaces scope.
+
+## Context
+
+Seeded content such as `Bakery loyalty carousel` should only use channels from its own workspace. The seed source assigns it to `Atlas Bakery Instagram`, but stale editor drafts or all-workspaces channel options can show unrelated Luma channels in the content detail editor.
+
+## Scope
+
+- Limit content detail channel options to the content item's workspace.
+- Deduplicate publication target parsing and summary serialization.
+- Normalize restored editor drafts so duplicate or other-workspace known channels are not kept.
+
+## Validation
+
+```bash
+cd frontend
+npm run build
+```
+
+## Acceptance Criteria
+
+- [x] Existing content items only offer channels from their own workspace.
+- [x] Duplicate publication target strings render as one placement.
+- [x] Stale restored drafts do not keep known channels from other workspaces.

docs/TASKS/content/006-content-activity-endpoint.md

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+# Task: Add content activity endpoint
+
+## Feature
+
+`docs/FEATURES/production-workflow.md`
+
+## Goal
+
+Add a content-owned activity history endpoint that is separate from user-facing notifications.
+
+## Scope
+
+- Add persisted content activity entries.
+- Add `GET /api/content-items/{id}/activity`.
+- Log content creation, revisions, status changes, comments, linked assets, and asset revisions.
+- Include field-level metadata for content revision changes such as title, message, channels, hashtags, and publish date.
+- Persist publish date changes sent from the content editor revision flow.
+- Use the activity endpoint from the content detail production activity tab.
+
+## Out Of Scope
+
+- Full diff rendering UI.
+- Deleting tags or assets.
+- Notification recipient behavior changes.
+
+## Validation
+
+```bash
+dotnet build backend/Socialize.slnx
+cd frontend
+npm run build
+```
+
+## Acceptance Criteria
+
+- [x] `GET /api/content-items/{id}/activity` returns content history for users who can review the content item.
+- [x] Activity entries are not filtered by notification recipients.
+- [x] Content revision activity records changed fields.
+- [x] Publish date changes are saved and included in content activity.
+- [x] The content detail activity tab reads from content activity instead of notifications.