Initial commit: Claude Code session viewer (Flutter macOS)

A desktop app that parses Claude Code .jsonl session logs and provides
a rich UI for exploring conversations, tool usage, subagents, and token
consumption. Features include project browser with auto-discovery of
~/.claude/projects, conversation timeline with inline subagent expansion,
agents overview, toolbelt chart, and token usage dashboard.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

test/widget_test.dart

@@ -0,0 +1,9 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:claude_session_viewer/main.dart';
+
+void main() {
+  testWidgets('App launches', (WidgetTester tester) async {
+    await tester.pumpWidget(const ClaudeSessionViewerApp());
+    expect(find.text('Claude Session Viewer'), findsOneWidget);
+  });
+}