Each sidebar section header (Projects, People, Topics, etc.) now shows
a + button on hover. Clicking it opens the CreateNoteDialog pre-filled
with that section's type, so users can quickly create new items without
manually selecting the type.
- Add defaultType prop to CreateNoteDialog for pre-selecting type
- Add onCreateType callback to Sidebar with hover-visible + button
- Wire up in App.tsx with unified openCreateDialog handler
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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