Adds a third editor mode (alongside WYSIWYG and Diff) that shows the raw
markdown file in a monospaced textarea. Includes:
- useRawMode hook with derived state (no setState-in-effect) and onFlushPending
- RawEditorView: textarea with 500ms debounce, YAML error banner, wikilink
autocomplete via [[ trigger, Cmd+S save
- BreadcrumbBar Code icon toggles raw mode; mutual exclusion with diff mode
- Command palette: "Toggle Raw Editor" (View group, requires active tab)
- useEditorModeExclusion hook extracted to keep Editor.tsx under complexity threshold
- buildViewCommands extracted from useCommandRegistry for same reason
- RawToggleButton and RawModeEditorSection components extracted for clean CC
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
ecd19c5be4