chore: update styles, add splash config, and improve search functionality

- Replace deprecated StyleSheet.absoluteFillObject with StyleSheet.absoluteFill (React Native 0.76+)
- Add splash screen configuration in app.json
- Fix duplicate UIBackgroundModes and add audio mode for iOS
- Disable Android ripple effect on tab bar buttons
- Improve SmartImage loading state to prevent unnecessary re-renders
- Refactor ImageGrid to use mainUri with separate previewUrl for better preview handling
- Add market search support with trade items tab in SearchScreen
- Pass homeTab prop to SearchScreen for context-aware search behavior
- Simplify fetchUnreadCount return type to void in MessageSyncService
- Fix StatusBar import from expo to react-native in ChatScreen

src/components/business/VoteCard.tsx

@@ -159,7 +159,7 @@ function createVoteCardStyles(colors: AppColors) {
       fontSize: fontSizes.sm,
     },
     loadingOverlay: {
-      ...StyleSheet.absoluteFillObject,
+      ...StyleSheet.absoluteFill,
       backgroundColor: colors.background.paper + 'CC',
       justifyContent: 'center',
       alignItems: 'center',