fix(web): hide unsupported Codex slash commands in remote mode (#357)

web/src/lib/locales/en.ts

@@ -209,6 +209,8 @@ export default {
   'composer.send': 'Send',
   'composer.stop': 'Stop',
   'composer.voice': 'Voice assistant',
+  'composer.codexSlashUnsupported.title': 'Codex command unavailable',
+  'composer.codexSlashUnsupported.body': 'HAPI remote mode does not yet run built-in Codex slash commands like {command}. Use natural language instead, or run it in the local Codex TUI.',
 
   // Voice assistant
   'voice.connecting': 'Connecting...',

web/src/lib/locales/zh-CN.ts

@@ -211,6 +211,8 @@ export default {
   'composer.send': '发送',
   'composer.stop': '停止',
   'composer.voice': '语音助手',
+  'composer.codexSlashUnsupported.title': '无法执行 Codex 命令',
+  'composer.codexSlashUnsupported.body': 'HAPI 远程模式暂不支持 {command} 这类 Codex 内建 slash command，请改用自然语言，或在本地 Codex TUI 中执行。',
 
   // Voice assistant
   'voice.connecting': '连接中...',