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>

lib/models/content_block.dart

@@ -0,0 +1,116 @@
+class ContentBlock {
+  final String type;
+  final Map<String, dynamic> raw;
+
+  ContentBlock({required this.type, required this.raw});
+
+  factory ContentBlock.fromJson(Map<String, dynamic> json) {
+    final type = json['type'] as String? ?? 'unknown';
+    switch (type) {
+      case 'text':
+        return TextBlock.fromJson(json);
+      case 'thinking':
+        return ThinkingBlock.fromJson(json);
+      case 'tool_use':
+        return ToolUseBlock.fromJson(json);
+      default:
+        return ContentBlock(type: type, raw: json);
+    }
+  }
+}
+
+class TextBlock extends ContentBlock {
+  final String text;
+
+  TextBlock({required this.text, required Map<String, dynamic> raw})
+      : super(type: 'text', raw: raw);
+
+  factory TextBlock.fromJson(Map<String, dynamic> json) {
+    return TextBlock(
+      text: json['text'] as String? ?? '',
+      raw: json,
+    );
+  }
+}
+
+class ThinkingBlock extends ContentBlock {
+  final String thinking;
+  final String? signature;
+
+  ThinkingBlock({
+    required this.thinking,
+    this.signature,
+    required Map<String, dynamic> raw,
+  }) : super(type: 'thinking', raw: raw);
+
+  factory ThinkingBlock.fromJson(Map<String, dynamic> json) {
+    return ThinkingBlock(
+      thinking: json['thinking'] as String? ?? '',
+      signature: json['signature'] as String?,
+      raw: json,
+    );
+  }
+}
+
+class ToolUseBlock extends ContentBlock {
+  final String id;
+  final String name;
+  final Map<String, dynamic> input;
+  ToolResultData? linkedResult;
+
+  ToolUseBlock({
+    required this.id,
+    required this.name,
+    required this.input,
+    this.linkedResult,
+    required Map<String, dynamic> raw,
+  }) : super(type: 'tool_use', raw: raw);
+
+  factory ToolUseBlock.fromJson(Map<String, dynamic> json) {
+    return ToolUseBlock(
+      id: json['id'] as String? ?? '',
+      name: json['name'] as String? ?? '',
+      input: (json['input'] as Map<String, dynamic>?) ?? {},
+      raw: json,
+    );
+  }
+
+  bool get isAgentCall => name == 'Agent';
+  String? get subagentType => isAgentCall ? input['subagent_type'] as String? : null;
+  String? get agentDescription => isAgentCall ? input['description'] as String? : null;
+  String? get agentPrompt => isAgentCall ? input['prompt'] as String? : null;
+}
+
+class ToolResultData {
+  final String toolUseId;
+  final dynamic content;
+  final bool isError;
+  final Map<String, dynamic> raw;
+
+  ToolResultData({
+    required this.toolUseId,
+    this.content,
+    this.isError = false,
+    required this.raw,
+  });
+
+  String get textContent {
+    if (content is String) return content;
+    if (content is List) {
+      return (content as List)
+          .where((c) => c is Map && c['type'] == 'text')
+          .map((c) => c['text'] as String? ?? '')
+          .join('\n');
+    }
+    return content?.toString() ?? '';
+  }
+
+  factory ToolResultData.fromJson(Map<String, dynamic> json) {
+    return ToolResultData(
+      toolUseId: json['tool_use_id'] as String? ?? '',
+      content: json['content'],
+      isError: json['is_error'] as bool? ?? false,
+      raw: json,
+    );
+  }
+}