Update NavigationRailM3E implementation; update FAB and navigation sections to adapt to changes.

packages/navigation_rail_m3e/example/lib/main.dart

@@ -0,0 +1,101 @@
+import 'package:flutter/material.dart';
+import 'package:navigation_rail_m3e/navigation_rail_m3e.dart';
+
+void main() {
+  runApp(const DemoApp());
+}
+
+class DemoApp extends StatefulWidget {
+  const DemoApp({super.key});
+  @override
+  State<DemoApp> createState() => _DemoAppState();
+}
+
+class _DemoAppState extends State<DemoApp> {
+  var type = NavigationRailM3EType.expanded;
+  var modality = NavigationRailM3EModality.standard;
+  int index = 0;
+
+  List<NavigationRailM3ESection> get sections => [
+        const NavigationRailM3ESection(
+          header: Text('Main'),
+          destinations: [
+            NavigationRailM3EDestination(
+              icon: Icon(Icons.edit_outlined),
+              selectedIcon: Icon(Icons.edit),
+              label: 'Edit',
+            ),
+            NavigationRailM3EDestination(
+              icon: Icon(Icons.star_outline),
+              selectedIcon: Icon(Icons.star),
+              label: 'Starred',
+              smallBadge: true,
+            ),
+            NavigationRailM3EDestination(
+              icon: Icon(Icons.inbox_outlined),
+              selectedIcon: Icon(Icons.inbox),
+              label: 'Inbox',
+              largeBadgeCount: 3,
+            ),
+          ],
+        ),
+      ];
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      debugShowCheckedModeBanner: false,
+      home: Scaffold(
+        appBar: AppBar(
+          title: const Text('NavigationRailM3E Demo'),
+          actions: [
+            IconButton(
+              onPressed: () => setState(() {
+                type = type == NavigationRailM3EType.expanded
+                    ? NavigationRailM3EType.collapsed
+                    : NavigationRailM3EType.expanded;
+              }),
+              icon: const Icon(Icons.swap_horiz),
+              tooltip: 'Toggle type',
+            ),
+            IconButton(
+              onPressed: () => setState(() {
+                modality = modality == NavigationRailM3EModality.standard
+                    ? NavigationRailM3EModality.modal
+                    : NavigationRailM3EModality.standard;
+              }),
+              icon: const Icon(Icons.layers),
+              tooltip: 'Toggle modality',
+            ),
+          ],
+        ),
+        body: Row(
+          children: [
+            NavigationRailM3E(
+              type: type,
+              modality: modality,
+              sections: sections,
+              selectedIndex: index,
+              onDestinationSelected: (i) => setState(() => index = i),
+              onTypeChanged: (t) => setState(() => type = t),
+              fab: NavigationRailM3EFabSlot(
+                icon: const Icon(Icons.add),
+                label: 'New',
+                onPressed: () {},
+              ),
+              hideWhenCollapsed: false,
+              expandedWidth: 280,
+              onDismissModal: () =>
+                  setState(() => modality = NavigationRailM3EModality.standard),
+            ),
+            Expanded(
+              child: Center(
+                child: Text('Selected index: $index'),
+              ),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}

packages/navigation_rail_m3e/example/pubspec.yaml

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+name: navigation_rail_m3e_example
+description: Example for navigation_rail_m3e
+publish_to: "none"
+
+environment:
+  sdk: ">=3.0.0 <4.0.0"
+
+dependencies:
+  flutter:
+    sdk: flutter
+  navigation_rail_m3e:
+    path: ../
+
+flutter:
+  uses-material-design: true