Adds a TitleField component between the breadcrumb bar and BlockNote
editor that serves as the primary title editing surface. The H1 block
inside BlockNote is hidden via CSS. The title field:
- Shows the note title in a prominent input field
- Displays the expected filename when it differs from the current one
- Triggers onTitleSync on blur/Enter to rename the file
- Responds to laputa:focus-editor selectTitle events for new notes
- Reverts on Escape or empty input
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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