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/code_block.dart

@@ -0,0 +1,111 @@
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+import 'package:flutter_markdown/flutter_markdown.dart';
+import 'package:markdown/markdown.dart' as md;
+
+class CodeBlockBuilder extends MarkdownElementBuilder {
+  @override
+  Widget? visitElementAfter(md.Element element, TextStyle? preferredStyle) {
+    final code = element.textContent;
+    final language = element.attributes['class']?.replaceFirst('language-', '') ?? '';
+
+    return CodeBlockWidget(
+      code: code,
+      language: language,
+    );
+  }
+}
+
+class CodeBlockWidget extends StatelessWidget {
+  final String code;
+  final String language;
+
+  const CodeBlockWidget({
+    super.key,
+    required this.code,
+    this.language = '',
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      margin: const EdgeInsets.symmetric(vertical: 8),
+      decoration: BoxDecoration(
+        color: const Color(0xFF0D1117),
+        borderRadius: BorderRadius.circular(8),
+        border: Border.all(color: Colors.grey.shade800),
+      ),
+      child: Column(
+        crossAxisAlignment: CrossAxisAlignment.stretch,
+        children: [
+          // Header with language and copy button
+          Container(
+            padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 8),
+            decoration: BoxDecoration(
+              color: Colors.grey.shade900,
+              borderRadius: const BorderRadius.only(
+                topLeft: Radius.circular(8),
+                topRight: Radius.circular(8),
+              ),
+            ),
+            child: Row(
+              mainAxisAlignment: MainAxisAlignment.spaceBetween,
+              children: [
+                Text(
+                  language.isNotEmpty ? language : 'code',
+                  style: TextStyle(
+                    fontSize: 12,
+                    color: Colors.grey.shade400,
+                    fontFamily: 'JetBrainsMono',
+                  ),
+                ),
+                InkWell(
+                  onTap: () {
+                    Clipboard.setData(ClipboardData(text: code));
+                    ScaffoldMessenger.of(context).showSnackBar(
+                      const SnackBar(
+                        content: Text('Code copied'),
+                        duration: Duration(seconds: 1),
+                      ),
+                    );
+                  },
+                  child: Padding(
+                    padding: const EdgeInsets.all(4),
+                    child: Row(
+                      mainAxisSize: MainAxisSize.min,
+                      children: [
+                        Icon(Icons.copy, size: 14, color: Colors.grey.shade400),
+                        const SizedBox(width: 4),
+                        Text(
+                          'Copy',
+                          style: TextStyle(
+                            fontSize: 12,
+                            color: Colors.grey.shade400,
+                          ),
+                        ),
+                      ],
+                    ),
+                  ),
+                ),
+              ],
+            ),
+          ),
+          // Code content
+          SingleChildScrollView(
+            scrollDirection: Axis.horizontal,
+            padding: const EdgeInsets.all(12),
+            child: SelectableText(
+              code.trimRight(),
+              style: const TextStyle(
+                fontFamily: 'JetBrainsMono',
+                fontSize: 13,
+                color: Color(0xFFE6EDF3),
+                height: 1.5,
+              ),
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+}