feat(ui): add bottom navigation with 4 tabs

app/src/main/java/com/radiola/ui/navigation/BottomNavBar.kt

@@ -0,0 +1,32 @@
+package com.radiola.ui.navigation
+
+import androidx.compose.material3.Icon
+import androidx.compose.material3.NavigationBar
+import androidx.compose.material3.NavigationBarItem
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.navigation.NavController
+import androidx.navigation.compose.currentBackStackEntryAsState
+
+@Composable
+fun BottomNavBar(navController: NavController) {
+    val currentRoute = navController.currentBackStackEntryAsState().value?.destination?.route
+    NavigationBar {
+        NavDestinations.items.forEach { destination ->
+            NavigationBarItem(
+                icon = { Icon(destination.icon, contentDescription = destination.labelRes) },
+                label = { Text(destination.labelRes) },
+                selected = currentRoute == destination.route,
+                onClick = {
+                    if (currentRoute != destination.route) {
+                        navController.navigate(destination.route) {
+                            popUpTo(navController.graph.startDestinationId) { saveState = true }
+                            launchSingleTop = true
+                            restoreState = true
+                        }
+                    }
+                }
+            )
+        }
+    }
+}