feat: route app keyboard handling through customizable shortcut registry

fix: apply theme variables to root app shell and overlays

fix: render minimap only when enabled in Settings; default off

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perf: lazy-mount panels (only render when open) + React.memo on RefImageNode/TextNoteNode to reduce re-renders

feat: annotation toolbar uses proper Pen/Highlighter/Eraser icons matching prototype2 design with larger size swatches

feat: App.tsx with highlighter button in annotation toolbar + isHighlighter destructured from store

fix: App.tsx listens for board://image_added event and adds captured images to canvas state directly"

feat: App.tsx - add V (value mirror), F (focus mode), H (flip), Z (zoom lens), Ctrl+G, Ctrl+D, BB (whisper) shortcuts

feat: App.tsx - add Shift+S screen region capture shortcut (SRS F-09) + Ctrl+S save toast + Shift+S flow

refactor: App.tsx - board-first entry point with canvas, toolbar, browser/library panels, minimap

fix: shield shows as inline panel not popup overlay, webview never hidden for overlays, stable hover widget, working board drag-move-delete"

fix: hide native webview while shell overlays are open

fix: make hover overlay, shield popup, and settings actually work

Add browser context menu listener in App + render Muse context menu on WebView right-click

Wire active tab ID through App to Sidebar and TitleBar

Properly sync native WebView visibility and measured bounds with React route

New App.tsx: React prototype layout wired to Tauri backend

Phase 4: Updated App.tsx with command palette, study mode, sessions

Fix Shield popover airspace and add Phase 3 library board core

Revise browser UI layout and add Phase 2 shield foundation

Revise UI and implement Phase 1 browser tabs

Phase 0 MUSE alpha skeleton and SRS docs