refactor(TabBar, HomeScreen): update styles for improved UI consistency

- Adjusted TabBar styles for better shadow effects and padding.
- Modified HomeScreen layout margins and padding for enhanced spacing.
- Updated font weight for modernTabText to improve text visibility.
- Changed active opacity for tab interactions to enhance user experience.

src/screens/home/HomeScreen.tsx

@@ -67,7 +67,7 @@ function createHomeStyles(colors: AppColors) {
     },
     searchWrapper: {
       paddingTop: spacing.lg,
-      paddingBottom: spacing.sm,
+      paddingBottom: spacing.xs,
       shadowColor: 'transparent',
       shadowOffset: { width: 0, height: 0 },
       shadowOpacity: 0,
@@ -75,8 +75,8 @@ function createHomeStyles(colors: AppColors) {
       elevation: 0,
     },
     homeTabBar: {
-      marginTop: spacing.xs,
-      marginBottom: spacing.sm,
+      marginTop: spacing.sm,
+      marginBottom: spacing.md,
     },
     viewToggleBtn: {
       width: 44,