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

app/(app)/(tabs)/_layout.tsx

@@ -1,8 +1,9 @@
 import { useMemo, useCallback } from 'react';
-import { Platform, useWindowDimensions } from 'react-native';
+import { Platform, Pressable, useWindowDimensions } from 'react-native';
 import { Tabs, usePathname } from 'expo-router';
 import { MaterialCommunityIcons } from '@expo/vector-icons';
 import { useSafeAreaInsets } from 'react-native-safe-area-context';
+import type { PressableProps } from 'react-native';
 
 import { useAppColors, shadows } from '../../../src/theme';
 import { BREAKPOINTS } from '../../../src/hooks';
@@ -12,6 +13,16 @@ const TAB_BAR_HEIGHT = 56;
 const TAB_BAR_FLOATING_MARGIN = 12;
 const TAB_BAR_MARGIN = 20;
 
+const TabBarButton = ({ children, style, ...rest }: PressableProps) => (
+  <Pressable
+    {...rest}
+    style={style}
+    android_ripple={null}
+  >
+    {children}
+  </Pressable>
+);
+
 export default function TabsLayout() {
   const colors = useAppColors();
   const { width } = useWindowDimensions();
@@ -72,6 +83,7 @@ export default function TabsLayout() {
           marginHorizontal: 2,
           paddingVertical: 1,
         },
+        tabBarButton: (props) => <TabBarButton {...props} />,
         tabBarShowLabel: true,
         tabBarLabelStyle: { fontSize: 11, fontWeight: '600', marginTop: -1 },
       }}