Fix null-safety issues (string | null → string), add missing VaultEntry
fields in test fixtures, remove unused imports, and fix type assertion.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
The single BlockNote editor instance was calling replaceBlocks before the
editor was mounted in the DOM, causing content swaps to silently fail.
Now tracks mount state via editor.onMount() and defers content swaps
until the editor is ready. Also guards against stale async parses when
the user switches tabs before markdown parsing completes.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Empty state rendering with keyboard shortcut hints
- Tab bar rendering and switching between tabs
- Close tab interaction
- Breadcrumb bar with note type, title, and word count
- New note button in tab bar
- BlockNote editor rendering
- Modified indicator and diff toggle button
- Inspector panel integration