feat(FN-1072): add Electron desktop renderer integration

- Add Electron main-process IPC handlers and preload bridges for API proxying, window controls, update install, and platform lookup
- Introduce a desktop renderer entrypoint with DesktopWrapper and a custom frameless TitleBar component
- Add Electron-aware renderer utilities including API transport selection and hooks for runtime detection, auto-update events, and deep links
- Update dashboard header behavior for Electron mode and expand desktop tests across preload, transport, hooks, and title bar flows
- Document the desktop renderer architecture and update desktop package config/dependencies

packages/desktop/package.json

@@ -43,13 +43,20 @@
     "electron-updater": "^6.6.0"
   },
   "devDependencies": {
+    "@testing-library/react": "^16.3.2",
     "@types/node": "^22.0.0",
+    "@types/react": "^19.0.0",
+    "@types/react-dom": "^19.0.0",
     "@vitest/coverage-v8": "^3.1.0",
     "electron": "^35.0.0",
     "electron-builder": "^26.0.0",
+    "jsdom": "^29.0.1",
+    "react": "^19.0.0",
+    "react-dom": "^19.0.0",
     "sharp": "^0.33.0",
     "tsx": "^4.19.0",
     "typescript": "^5.7.0",
+    "vite": "^6.0.0",
     "vitest": "^3.1.0"
   }
 }