Initial commit: JustAMessenger v0.1.0

Серверная часть (Go):
- WebSocket сервер с бинарным протоколом
- XChaCha20-Poly1305 шифрование
- zstd сжатие с дедупликацией (64KB чанки)
- SQLite хранилище (WAL режим)
- Управление гильдиями, каналами, ролями
- Федерация между серверами (ed25519)
- REST API + WebSocket endpoints

Клиентская часть (Flutter):
- Material Design 3 тёмная тема (Discord-like)
- WebSocket соединение с сервером
- Экраны: сплэш, логин, домашний, гильдии, чат
- Модели: пользователи, гильдии, каналы, сообщения, роли
- Сервисы: соединение, API, криптография, тема
- Виджеты: иконки гильдий, сообщения, ввод чата
- Web сборка (PWA)

Документация:
- AGENTS.md — контекст для ИИ ассистентов
- docs/protocol.md — спецификация протокола

client/lib/widgets/chat_input.dart

@@ -0,0 +1,162 @@
+import 'package:flutter/material.dart';
+import '../services/theme_service.dart';
+
+class ChatInput extends StatefulWidget {
+  final TextEditingController controller;
+  final VoidCallback? onSend;
+  final String channelId;
+  final void Function(String)? onSendMessage;
+
+  const ChatInput({
+    super.key,
+    required this.controller,
+    this.onSend,
+    this.onSendMessage,
+    required this.channelId,
+  });
+
+  @override
+  State<ChatInput> createState() => _ChatInputState();
+}
+
+class _ChatInputState extends State<ChatInput> {
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
+      decoration: const BoxDecoration(
+        color: ThemeService.surfaceSecondary,
+        border: Border(top: BorderSide(color: Color(0xFF3F4147))),
+      ),
+      child: Row(
+        children: [
+          IconButton(
+            icon: const Icon(Icons.add_circle_outline,
+                color: ThemeService.textSecondary, size: 24),
+            onPressed: _showAttachmentMenu,
+            tooltip: 'Attach',
+          ),
+          const SizedBox(width: 4),
+          Expanded(
+            child: TextField(
+              controller: widget.controller,
+              maxLines: 5,
+              minLines: 1,
+              textCapitalization: TextCapitalization.sentences,
+              style: const TextStyle(
+                color: ThemeService.textPrimary,
+                fontSize: 15,
+              ),
+              decoration: InputDecoration(
+                hintText: 'Message #${widget.channelId.split('-').first}',
+                hintStyle: const TextStyle(
+                  color: ThemeService.textMuted,
+                  fontSize: 15,
+                ),
+                filled: true,
+                fillColor: ThemeService.surfacePrimary,
+                border: OutlineInputBorder(
+                  borderRadius: BorderRadius.circular(8),
+                  borderSide: BorderSide.none,
+                ),
+                contentPadding: const EdgeInsets.symmetric(
+                    horizontal: 12, vertical: 10),
+                isDense: true,
+              ),
+              onSubmitted: (text) => widget.onSendMessage?.call(text),
+            ),
+          ),
+          const SizedBox(width: 4),
+          IconButton(
+            icon: const Icon(Icons.mic_none,
+                color: ThemeService.textSecondary, size: 24),
+            onPressed: _startVoiceRecording,
+            tooltip: 'Voice message',
+          ),
+          IconButton(
+            icon: const Icon(Icons.send_rounded,
+                color: ThemeService.primary, size: 24),
+            onPressed: () => widget.onSendMessage
+                ?.call(widget.controller.text),
+            tooltip: 'Send',
+          ),
+        ],
+      ),
+    );
+  }
+
+  void _showAttachmentMenu() {
+    showModalBottomSheet(
+      context: context,
+      backgroundColor: ThemeService.surfaceSecondary,
+      shape: const RoundedRectangleBorder(
+        borderRadius: BorderRadius.vertical(top: Radius.circular(12)),
+      ),
+      builder: (ctx) => SafeArea(
+        child: Padding(
+          padding: const EdgeInsets.all(16),
+          child: Column(
+            mainAxisSize: MainAxisSize.min,
+            children: [
+              const Text(
+                'Attach',
+                style: TextStyle(
+                  color: ThemeService.textPrimary,
+                  fontSize: 16,
+                  fontWeight: FontWeight.w600,
+                ),
+              ),
+              const SizedBox(height: 16),
+              Row(
+                mainAxisAlignment: MainAxisAlignment.spaceAround,
+                children: [
+                  _attachmentButton(Icons.photo, 'Image', () => Navigator.pop(ctx)),
+                  _attachmentButton(Icons.videocam, 'Video', () => Navigator.pop(ctx)),
+                  _attachmentButton(Icons.description, 'File', () => Navigator.pop(ctx)),
+                  _attachmentButton(Icons.mic, 'Voice', () => Navigator.pop(ctx)),
+                ],
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+
+  Widget _attachmentButton(IconData icon, String label, VoidCallback onTap) {
+    return InkWell(
+      onTap: onTap,
+      child: Column(
+        mainAxisSize: MainAxisSize.min,
+        children: [
+          Container(
+            width: 56,
+            height: 56,
+            decoration: BoxDecoration(
+              color: ThemeService.surfacePrimary,
+              borderRadius: BorderRadius.circular(14),
+            ),
+            child: Icon(icon, color: ThemeService.textSecondary, size: 28),
+          ),
+          const SizedBox(height: 6),
+          Text(
+            label,
+            style: const TextStyle(
+              color: ThemeService.textSecondary,
+              fontSize: 12,
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+
+  void _startVoiceRecording() {
+    ScaffoldMessenger.of(context).showSnackBar(
+      const SnackBar(
+        content: Text('Voice recording coming soon...'),
+        duration: Duration(seconds: 1),
+      ),
+    );
+  }
+}