Add calendar integrations and collaboration updates

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.