Fix intermittent Android crash by upgrading Reanimated to 4.3.1

Reanimated 4.1.x crashes on Android with a NullPointerException in
ViewGroup.dispatchDraw (ReactViewGroup.dispatchDraw) — a child view is
null mid-draw because Reanimated commits a ShadowTree change during the
Android draw pass, mutating the view hierarchy while it's being painted.
Fixed upstream in 4.3.0 (software-mansion/react-native-reanimated#9072).

4.3.x requires react-native-worklets 0.8.x, so worklets moves 0.5.1 ->
0.8.3 in lockstep. react-native is pinned to exact 0.81.5 so the
re-resolve can't pull 0.81.6 (which needs react ^19.1.4, conflicting with
the react 19.1.0 override), and reanimated/worklets are added to root
overrides to force a single version across the tree — two copies of the
worklets runtime throw a version-mismatch at startup.

packages/app/package.json

@@ -85,14 +85,14 @@
     "qrcode": "^1.5.4",
     "react": "19.1.0",
     "react-dom": "19.1.0",
-    "react-native": "^0.81.5",
+    "react-native": "0.81.5",
     "react-native-draggable-flatlist": "^4.0.3",
     "react-native-edge-to-edge": "^1.7.0",
     "react-native-gesture-handler": "~2.28.0",
     "react-native-keyboard-controller": "^1.19.2",
     "react-native-markdown-display": "^7.0.2",
     "react-native-nitro-modules": "0.35.5",
-    "react-native-reanimated": "~4.1.1",
+    "react-native-reanimated": "~4.3.1",
     "react-native-safe-area-context": "~5.6.0",
     "react-native-screens": "~4.16.0",
     "react-native-svg": "^15.14.0",
@@ -100,7 +100,7 @@
     "react-native-unistyles": "^3.2.4",
     "react-native-web": "~0.21.0",
     "react-native-webview": "^13.16.0",
-    "react-native-worklets": "0.5.1",
+    "react-native-worklets": "~0.8.3",
     "tiny-invariant": "^1.3.3",
     "use-sync-external-store": "^1.6.0",
     "zod": "^3.23.8",