feat(webui): add lightweight session messaging via mentions

webui/src/i18n/locales/zh-TW/common.json

@@ -1166,7 +1166,6 @@
       "placeholderStreaming": "模型正在回覆…",
       "inputAria": "訊息輸入框",
       "sendHint": "Enter 送出 · Shift+Enter 換行",
-      "runRuntimeTitle": "執行中 · {{elapsed}}",
       "goalStateStrip": "目標 · {{label}}",
       "goalStateFallback": "目標",
       "goalStateExpandAria": "檢視完整目標",
@@ -1326,9 +1325,7 @@
         "cliDescription": "將 @{{name}} 作為本機 CLI 應用程式使用",
         "mcpDescription": "將 @{{name}} 作為 MCP 伺服器使用",
         "cliTitle": "CLI 應用程式：{{name}}",
-        "mcpTitle": "MCP 伺服器：{{name}}",
-        "sessionBadge": "Nanobot 對話",
-        "sessionDescription": "引用先前的對話 @{{name}}"
+        "mcpTitle": "MCP 伺服器：{{name}}"
       },
       "workspace": {
         "accessAria": "工作區存取模式",