Add Widgetbook setup with theme configuration, analysis options, and initial component use cases

widgetbook/lib/main.dart

@@ -0,0 +1,40 @@
+import 'package:flutter/material.dart';
+import 'package:m3e_design/m3e_design.dart';
+import 'package:widgetbook/widgetbook.dart';
+import 'package:widgetbook_annotation/widgetbook_annotation.dart' as widgetbook;
+
+// Generated by widgetbook_generator
+import 'main.directories.g.dart';
+
+void main() {
+  runApp(const WidgetbookApp());
+}
+
+@widgetbook.App()
+class WidgetbookApp extends StatelessWidget {
+  const WidgetbookApp({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    final themeLight =
+        ColorScheme.fromSeed(seedColor: Colors.purple).toM3EThemeData();
+    final themeDark = ColorScheme.fromSeed(
+            seedColor: Colors.purple, brightness: Brightness.dark)
+        .toM3EThemeData();
+
+    return Widgetbook.material(
+      directories: directories,
+      lightTheme: themeLight,
+      darkTheme: themeDark,
+      addons: [
+        MaterialThemeAddon(
+          themes: [
+            WidgetbookTheme(name: 'Light', data: themeLight),
+            WidgetbookTheme(name: 'Dark', data: themeDark),
+          ],
+        ),
+        TextScaleAddon(),
+      ],
+    );
+  }
+}