feat(app): Workspace-Umbau Schritt 1 — gesture-handler/reanimated/webview + Root-Wrapper

Fundament fuer den zoombaren Desktop-Workspace:
- react-native-gesture-handler@2.14.1, react-native-reanimated@3.6.2,
  react-native-webview@13.6.4 (kompatibel mit RN 0.73.4 / Hermes / old-arch)
- babel.config.js: reanimated/plugin als letztes Plugin
- index.js: gesture-handler als allererster Import
- App.tsx: GestureHandlerRootView um den gesamten Baum

Hinweis: nach npm install einmalig `npm start --reset-cache` + nativer Rebuild
(gradlew clean), sonst brechen die reanimated-Worklets still.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

android/package.json

@@ -20,12 +20,15 @@
     "react-native-camera-kit": "^13.0.0",
     "react-native-document-picker": "^9.1.1",
     "react-native-fs": "^2.20.0",
+    "react-native-gesture-handler": "2.14.1",
     "react-native-image-picker": "^7.1.0",
     "react-native-permissions": "^4.1.4",
+    "react-native-reanimated": "3.6.2",
     "react-native-safe-area-context": "^4.8.2",
     "react-native-screens": "3.27.0",
     "react-native-sound": "^0.11.2",
-    "react-native-svg": "^14.1.0"
+    "react-native-svg": "^14.1.0",
+    "react-native-webview": "13.6.4"
   },
   "devDependencies": {
     "@react-native/eslint-config": "^0.73.2",