feat: initial Pyramid project scaffold

lib/core/app.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_localizations/flutter_localizations.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:pyramid/core/router.dart';
+import 'package:pyramid/core/theme.dart';
+
+class PyramidApp extends ConsumerWidget {
+  const PyramidApp({super.key});
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final router = ref.watch(routerProvider);
+    final colorScheme = ref.watch(colorSchemeProvider);
+
+    return MaterialApp.router(
+      title: 'Pyramid',
+      theme: buildTheme(colorScheme, Brightness.light),
+      darkTheme: buildTheme(colorScheme, Brightness.dark),
+      themeMode: ThemeMode.system,
+      routerConfig: router,
+      localizationsDelegates: const [
+        GlobalMaterialLocalizations.delegate,
+        GlobalWidgetsLocalizations.delegate,
+        GlobalCupertinoLocalizations.delegate,
+      ],
+      supportedLocales: const [Locale('de'), Locale('en')],
+    );
+  }
+}

lib/core/router.dart

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+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:go_router/go_router.dart';
+import 'package:pyramid/layout/shell_page.dart';
+import 'package:pyramid/features/rooms/rooms_page.dart';
+import 'package:pyramid/features/chat/chat_page.dart';
+import 'package:pyramid/features/settings/settings_page.dart';
+
+final routerProvider = Provider<GoRouter>((ref) {
+  return GoRouter(
+    initialLocation: '/rooms',
+    routes: [
+      ShellRoute(
+        builder: (context, state, child) => ShellPage(child: child),
+        routes: [
+          GoRoute(
+            path: '/rooms',
+            builder: (context, state) => const RoomsPage(),
+          ),
+          GoRoute(
+            path: '/chat/:roomId',
+            builder: (context, state) =>
+                ChatPage(roomId: state.pathParameters['roomId']!),
+          ),
+          GoRoute(
+            path: '/settings',
+            builder: (context, state) => const SettingsPage(),
+          ),
+        ],
+      ),
+    ],
+  );
+});

lib/core/theme.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+final colorSchemeProvider = Provider<ColorScheme>((ref) {
+  return ColorScheme.fromSeed(
+    seedColor: const Color(0xFF6B4FA0),
+    brightness: Brightness.light,
+  );
+});
+
+ThemeData buildTheme(ColorScheme colorScheme, Brightness brightness) {
+  final scheme = brightness == Brightness.dark
+      ? ColorScheme.fromSeed(
+          seedColor: const Color(0xFF6B4FA0),
+          brightness: Brightness.dark,
+        )
+      : colorScheme;
+
+  return ThemeData(
+    colorScheme: scheme,
+    useMaterial3: true,
+    dividerTheme: const DividerThemeData(space: 1, thickness: 1),
+  );
+}

lib/features/chat/chat_page.dart

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+import 'package:flutter/material.dart';
+
+class ChatPage extends StatelessWidget {
+  final String roomId;
+  const ChatPage({super.key, required this.roomId});
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: Text(roomId)),
+      body: const Center(child: Text('Chat')),
+    );
+  }
+}

lib/features/rooms/rooms_page.dart

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+import 'package:flutter/material.dart';
+
+class RoomsPage extends StatelessWidget {
+  const RoomsPage({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return const Scaffold(
+      body: Center(child: Text('Rooms')),
+    );
+  }
+}

lib/features/settings/settings_page.dart

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+import 'package:flutter/material.dart';
+
+class SettingsPage extends StatelessWidget {
+  const SettingsPage({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return const Scaffold(
+      body: Center(child: Text('Settings')),
+    );
+  }
+}

lib/layout/panel_layout.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:pyramid/features/rooms/rooms_page.dart';
+
+final sidebarWidthProvider = StateProvider<double>((ref) => 280);
+
+class PanelLayout extends ConsumerWidget {
+  final Widget mainContent;
+  const PanelLayout({super.key, required this.mainContent});
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final sidebarWidth = ref.watch(sidebarWidthProvider);
+
+    return Row(
+      children: [
+        SizedBox(
+          width: sidebarWidth,
+          child: const RoomsPage(),
+        ),
+        _ResizeDivider(
+          onDrag: (delta) {
+            final notifier = ref.read(sidebarWidthProvider.notifier);
+            notifier.state =
+                (notifier.state + delta).clamp(180.0, 480.0);
+          },
+        ),
+        Expanded(child: mainContent),
+      ],
+    );
+  }
+}
+
+class _ResizeDivider extends StatelessWidget {
+  final ValueChanged<double> onDrag;
+  const _ResizeDivider({required this.onDrag});
+
+  @override
+  Widget build(BuildContext context) {
+    return GestureDetector(
+      behavior: HitTestBehavior.translucent,
+      onHorizontalDragUpdate: (d) => onDrag(d.delta.dx),
+      child: MouseRegion(
+        cursor: SystemMouseCursors.resizeColumn,
+        child: Container(
+          width: 6,
+          color: Theme.of(context).dividerColor,
+        ),
+      ),
+    );
+  }
+}

lib/layout/shell_page.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:pyramid/layout/panel_layout.dart';
+
+class ShellPage extends ConsumerWidget {
+  final Widget child;
+  const ShellPage({super.key, required this.child});
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final isWide = MediaQuery.sizeOf(context).width >= 700;
+
+    return Scaffold(
+      body: isWide
+          ? PanelLayout(mainContent: child)
+          : child,
+    );
+  }
+}

lib/main.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:pyramid/core/app.dart';
+
+void main() async {
+  WidgetsFlutterBinding.ensureInitialized();
+  runApp(const ProviderScope(child: PyramidApp()));
+}