fix(notes): fix notes command, tags detail view, and editor opening flow
- Fix `notes` command to return correct output format (mimeType: 'item')
so cmd panel can display the notes list and let users select items
- Show full note text in tags detail modal instead of truncating to 100 chars,
with scrollable container for long content
- Add "Edit in Editor" button for text items in tags detail modal that
publishes editor:open with the item's ID
- Make ESC in tags detail modal go back to tags list instead of closing
the entire window (IZUI navigation pattern from groups extension)
- Add editor:add subscriber in editor/background.js to open blank editor
when other extensions publish editor:add events