refactor(ui): optimize bottom navigation behavior

This commit improves the navigation logic within `BottomNavigation` by implementing standard state preservation and restoration. This ensures that the back stack is properly managed and the state of individual tabs is maintained when switching between them.

- **refactor(ui)**: Updated `navController.navigate` in `BottomNavigation` to use `popUpTo` the home screen with `saveState = true`.
- **refactor(ui)**: Enabled `launchSingleTop` and `restoreState` to prevent multiple instances of the same destination and restore previous tab states.

Author: rainxchzed

composeApp/src/commonMain/kotlin/zed/rainxch/githubstore/app/navigation/AppNavigation.kt

@@ -248,7 +248,14 @@ fun AppNavigation(
                 BottomNavigation(
                     currentScreen = currentScreen,
                     onNavigate = {
-                        navController.navigate(it)
+                        navController.navigate(it) {
+                            popUpTo(GithubStoreGraph.HomeScreen) {
+                                saveState = true
+                            }
+
+                            launchSingleTop = true
+                            restoreState = true
+                        }
                     },
                     modifier = Modifier
                         .align(Alignment.BottomCenter)