feat: scheduled releases — calendar UI, publish scheduling, and section badges

[rafavalls]

Summary

• New scheduled-releases tool + resource: 5 MCP tools (list, create, add_change, cancel, reschedule) backed by a local JSON store in .context/; corresponding MCP resource serving the unified app HTML
• Calendar + list UI (web/tools/scheduled-releases/): month-grid calendar with multi-week release bars, list view, release detail with reschedule/cancel, create dialog with date/time pickers
• Publish dialog scheduling tab (publish-dialog.tsx): from the publish drawer users can attach the current section to an upcoming release or create a new one inline, with a date picker for immediate scheduling
• Section badges in CMS panel (index.tsx): sections that belong to a scheduled release show a sky-blue badge with the release name and next date; badge updates in real time as releases are fetched on mount

Test plan

• Open file explorer → click Publish → "Schedule" tab appears alongside "Publish now"
• Create a release from the schedule tab; verify it shows in the Releases calendar
• Add a section to a release; verify the sky badge appears on that section row in the CMS panel
• Open the list_scheduled_releases tool directly; verify calendar/list views render
• Create, reschedule, and cancel a release from the calendar UI
• Verify TypeScript check passes: bun run check

🤖 Generated with Claude Code

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Summary by cubic

Adds scheduled releases with a calendar + list UI, scheduling in the publish dialog, and section badges so teams can plan and attach changes to upcoming releases. Adds MCP tools and a public resource, and sorts imports in the file explorer to satisfy CI.

• New Features
  • MCP tools: list_scheduled_releases, create_scheduled_release, add_change_to_release, cancel_scheduled_release, reschedule_scheduled_release; persisted in .context/ JSON.
  • Public resource ui://mcp-app/scheduled-releases serving the unified app HTML for the Releases UI.
  • Calendar + list UI: month grid with multi-week bars, release detail, and create/reschedule/cancel dialogs.
  • Publish dialog scheduling tab: pick an existing release or create one inline with date/time pickers; attaches the current section.
  • CMS panel badges: sections in a scheduled release show a sky-blue badge with release name and next date; updates as releases load.

^{Written for commit 3415f01. Summary will update on new commits.}