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/quiz/components/QuizShareModal.tsx

@@ -13,7 +13,7 @@ import { BlurView } from "expo-blur";
 import Animated, { FadeIn, FadeOut, SlideInDown, SlideOutDown } from "react-native-reanimated";
 import { Ionicons } from "@expo/vector-icons";
 import { useSafeAreaInsets } from "react-native-safe-area-context";
-import ViewShot from "react-native-view-shot";
+import ViewShot, { type ViewShotRef } from "react-native-view-shot";
 import * as Sharing from "expo-sharing";
 import { colors, spacing, typography, blur } from "../../../theme";
 import { shareToInstagramStories } from "../../../lib/instagramShare";
@@ -32,7 +32,7 @@ export function QuizShareModal({ visible, onClose, scorePercent }: QuizShareModa
     const insets = useSafeAreaInsets();
     const { width: screenWidth } = useWindowDimensions();
     const cardWidth = Math.min(screenWidth - 64, MAX_CARD_WIDTH);
-    const shareViewRef = useRef<ViewShot>(null);
+    const shareViewRef = useRef<ViewShotRef>(null);
     const [capturedUri, setCapturedUri] = useState<string | null>(null);
     const [isCapturing, setIsCapturing] = useState(false);