feat: configure tab navigation

- Setup tabs with FinanceTracker theme
- Add two tabs: Keuangan and Statistik
- Custom tab bar styling

app/(tabs)/_layout.tsx

@@ -1,35 +1,34 @@
 import { Tabs } from 'expo-router';
 import React from 'react';
 
-import { HapticTab } from '@/components/haptic-tab';
 import { IconSymbol } from '@/components/ui/icon-symbol';
-import { Colors } from '@/constants/theme';
-import { useColorScheme } from '@/hooks/use-color-scheme';
+import { COLORS } from '@/constants/theme';
 
 export default function TabLayout() {
-  const colorScheme = useColorScheme();
-
   return (
     <Tabs
       screenOptions={{
-        tabBarActiveTintColor: Colors[colorScheme ?? 'light'].tint,
+        tabBarActiveTintColor: COLORS.primary,
         headerShown: false,
-        tabBarButton: HapticTab,
+        tabBarStyle: {
+          backgroundColor: COLORS.card,
+          borderTopColor: COLORS.border,
+        },
       }}>
       <Tabs.Screen
         name="index"
         options={{
-          title: 'Home',
+          title: 'Keuangan',
           tabBarIcon: ({ color }) => <IconSymbol size={28} name="house.fill" color={color} />,
         }}
       />
       <Tabs.Screen
         name="explore"
         options={{
-          title: 'Explore',
-          tabBarIcon: ({ color }) => <IconSymbol size={28} name="paperplane.fill" color={color} />,
+          title: 'Statistik',
+          tabBarIcon: ({ color }) => <IconSymbol size={28} name="chart.bar.fill" color={color} />,
         }}
       />
     </Tabs>
   );
-}
+}