Initial commit: Captain Claude Mobile App

- Flutter app with chat and terminal screens
- WebSocket integration for real-time chat
- xterm integration for screen sessions
- Markdown rendering with code blocks
- JWT authentication

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

lib/widgets/markdown_viewer.dart

@@ -0,0 +1,68 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_markdown/flutter_markdown.dart';
+import 'code_block.dart';
+
+class MarkdownViewer extends StatelessWidget {
+  final String data;
+  final bool selectable;
+
+  const MarkdownViewer({
+    super.key,
+    required this.data,
+    this.selectable = true,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return MarkdownBody(
+      data: data,
+      selectable: selectable,
+      styleSheet: MarkdownStyleSheet(
+        p: const TextStyle(fontSize: 15, height: 1.5),
+        h1: const TextStyle(fontSize: 24, fontWeight: FontWeight.bold),
+        h2: const TextStyle(fontSize: 20, fontWeight: FontWeight.bold),
+        h3: const TextStyle(fontSize: 18, fontWeight: FontWeight.bold),
+        h4: const TextStyle(fontSize: 16, fontWeight: FontWeight.bold),
+        code: TextStyle(
+          fontFamily: 'JetBrainsMono',
+          backgroundColor: Colors.black.withOpacity(0.3),
+          fontSize: 13,
+        ),
+        codeblockDecoration: BoxDecoration(
+          color: const Color(0xFF0D1117),
+          borderRadius: BorderRadius.circular(8),
+        ),
+        blockquotePadding: const EdgeInsets.symmetric(
+          horizontal: 12,
+          vertical: 8,
+        ),
+        blockquoteDecoration: BoxDecoration(
+          border: Border(
+            left: BorderSide(
+              color: Theme.of(context).colorScheme.primary,
+              width: 3,
+            ),
+          ),
+        ),
+        listBullet: TextStyle(
+          color: Theme.of(context).colorScheme.primary,
+        ),
+        tableHead: const TextStyle(fontWeight: FontWeight.bold),
+        tableBody: const TextStyle(),
+        tableBorder: TableBorder.all(
+          color: Colors.grey.shade700,
+          width: 1,
+        ),
+        tableCellsPadding: const EdgeInsets.all(8),
+        horizontalRuleDecoration: BoxDecoration(
+          border: Border(
+            top: BorderSide(color: Colors.grey.shade700, width: 1),
+          ),
+        ),
+      ),
+      builders: {
+        'code': CodeBlockBuilder(),
+      },
+    );
+  }
+}