The editor was not persisting changes to disk. Edits would be lost
when closing and reopening a note.
Changes:
- Add save_note_content Tauri command (Rust) with read-only file check
- Add save_note_content mock handler for browser testing
- Add useAutoSave hook with 500ms debounce and flush-on-tab-switch
- Wire up BlockNote onChange → markdown serialization → auto-save
- Add restoreWikilinksInBlocks utility (reverse of injectWikilinks)
to convert wikilink nodes back to [[target]] before markdown export
- Extract shared walkBlocks helper to eliminate code duplication
- Suppress onChange during programmatic content swaps (tab switching)
- 12 new frontend tests + 5 new Rust tests (all 469 + 174 passing)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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