Normalize initial route information in page control

Introduced a static normalize() method in FletRouteInformationProvider to ensure initial and pushed route information have a normalized path. Updated PageControl to use the normalized initial route, improving consistency in route handling.

Author: FeodorFitsner

packages/flet/lib/src/controls/page.dart

@@ -80,9 +80,15 @@ class _PageControlState extends State<PageControl> with WidgetsBindingObserver {
     _updateMultiViews();
 
     _routeParser = RouteParser();
-    _routeInformationProvider = FletRouteInformationProvider(
-      initialRouteInformation: RouteInformation(uri: Uri(path: '/')),
+    final defaultRouteName =
+        WidgetsBinding.instance.platformDispatcher.defaultRouteName;
+    final initialUri =
+        Uri.tryParse(defaultRouteName) ?? Uri(path: '/');
+    final initial = FletRouteInformationProvider.normalize(
+      RouteInformation(uri: initialUri),
     );
+    _routeInformationProvider =
+        FletRouteInformationProvider(initialRouteInformation: initial);
 
     _routeState = RouteState(_routeParser);
     _routeState.addListener(_routeChanged);

packages/flet/lib/src/routing/route_information_provider.dart

@@ -1,25 +1,27 @@
 import 'package:flutter/widgets.dart';
 
 class FletRouteInformationProvider extends PlatformRouteInformationProvider {
-  FletRouteInformationProvider({
-    required super.initialRouteInformation,
-  });
-
-  @override
-  Future<bool> didPushRouteInformation(RouteInformation routeInformation) {
+  static RouteInformation normalize(RouteInformation routeInformation) {
     final uri = routeInformation.uri;
-
-    debugPrint("FletRouteInformationProvider.didPushRouteInformation: $uri");
-
-    // Convert "flet://flet-host/aaa" -> "/aaa" (keep query/fragment)
-    final normalized = RouteInformation(
+    return RouteInformation(
       uri: Uri(
         path: uri.path.isEmpty ? '/' : uri.path,
         query: uri.query,
         fragment: uri.fragment,
       ),
       state: routeInformation.state,
     );
+  }
+
+  FletRouteInformationProvider({
+    required super.initialRouteInformation,
+  });
+
+  @override
+  Future<bool> didPushRouteInformation(RouteInformation routeInformation) {
+    final normalized = normalize(routeInformation);
+    debugPrint(
+        "FletRouteInformationProvider.didPushRouteInformation: ${routeInformation.uri} -> ${normalized.uri}");
 
     // IMPORTANT: returning the result of super ensures this event is "handled"
     // (so iOS won't log "Failed to handle route information...").