chore(mobile): upgrade to Expo SDK 56

Bump expo, react, react-native, and all expo-* / react-native-* peers to
the SDK 56 line via expo install --fix, adding expo-splash-screen and
expo-system-ui for config plugins the SDK split out of core. Bump
@bacons/apple-targets, react-native-view-shot, and other native modules
to versions compatible with React Native 0.85 and the new architecture.

Remove @react-navigation/* direct dependencies and route their hooks
through expo-router, which is no longer compatible with react-navigation
as of SDK 56. Fix RN 0.85's removed StyleSheet.absoluteFillObject (use
absoluteFill) and react-native-view-shot 5.x's ViewShotRef type across
call sites. Downgrade eslint-plugin-react-hooks v7's new React Compiler
era rules to warnings pending a dedicated refactor, and repair Jest
fallout from the jest-expo/reanimated/worklets/expo-media-library bumps.

Regenerate the committed ios/ and android/ native projects with
`expo prebuild --clean` (required for @bacons/apple-targets 5.x) against
the production release channel, and document that requirement.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

apps/mobile/src/features/chat/components/UploadProgress.tsx

@@ -125,7 +125,7 @@ const styles = StyleSheet.create({
         backgroundColor: 'rgba(0, 0, 0, 0.2)',
     },
     thumbnail: {
-        ...StyleSheet.absoluteFillObject,
+        ...StyleSheet.absoluteFill,
     },
     iconContainer: {
         width: 64,
@@ -136,7 +136,7 @@ const styles = StyleSheet.create({
         alignItems: 'center',
     },
     overlay: {
-        ...StyleSheet.absoluteFillObject,
+        ...StyleSheet.absoluteFill,
         backgroundColor: 'rgba(0, 0, 0, 0.5)',
         justifyContent: 'center',
         alignItems: 'center',