feat: add Discuss and Explore subagents for dynamic critique and code exploration

- Implement Discuss Subagent for multi-perspective critique with dynamic perspectives.
- Create Explore Subagent for shared codebase exploration with centralized caching.
- Add tests for CcwToolsMcpCard component to ensure enabled tools are preserved on config save.
- Introduce SessionPreviewPanel component for previewing and selecting sessions for Memory V2 extraction.
- Develop CommandCreateDialog component for creating/importing commands with import and CLI generate modes.

ccw/frontend/src/locales/zh/commands.json

@@ -10,7 +10,8 @@
     "collapseAll": "全部收起",
     "copy": "复制",
     "showDisabled": "显示已禁用",
-    "hideDisabled": "隐藏已禁用"
+    "hideDisabled": "隐藏已禁用",
+    "cancel": "取消"
   },
   "source": {
     "builtin": "内置",
@@ -57,5 +58,45 @@
     "clickToDisableAll": "点击全部禁用",
     "noCommands": "此分组中没有命令",
     "noEnabledCommands": "此分组中没有已启用的命令"
+  },
+  "create": {
+    "title": "创建命令",
+    "location": "存储位置",
+    "locationProject": "项目命令",
+    "locationProjectHint": ".claude/commands/",
+    "locationUser": "全局命令",
+    "locationUserHint": "~/.claude/commands/",
+    "mode": "创建方式",
+    "modeImport": "导入文件",
+    "modeImportHint": "从现有文件导入命令",
+    "modeGenerate": "AI 生成",
+    "modeGenerateHint": "使用 AI 生成命令",
+    "sourcePath": "源文件路径",
+    "sourcePathPlaceholder": "输入命令文件的绝对路径",
+    "sourcePathHint": "文件必须是有效的命令 Markdown 文件",
+    "customName": "自定义名称",
+    "customNamePlaceholder": "留空则使用原始名称",
+    "customNameHint": "可选，覆盖默认命令名称",
+    "commandName": "命令名称",
+    "commandNamePlaceholder": "输入命令名称",
+    "commandNameHint": "用作命令文件名称",
+    "descriptionLabel": "命令描述",
+    "descriptionPlaceholder": "描述这个命令应该做什么...",
+    "descriptionHint": "AI 将根据描述生成命令内容",
+    "generateInfo": "AI 将使用 CLI 工具生成命令",
+    "generateTimeHint": "生成过程可能需要一些时间",
+    "validate": "验证",
+    "import": "导入",
+    "generate": "生成",
+    "validating": "验证中...",
+    "validCommand": "验证通过",
+    "invalidCommand": "验证失败",
+    "creating": "创建中...",
+    "created": "命令 \"{name}\" 创建成功",
+    "createError": "创建命令失败",
+    "sourcePathRequired": "请输入源文件路径",
+    "commandNameRequired": "请输入命令名称",
+    "descriptionRequired": "请输入命令描述",
+    "validateFirst": "请先验证命令文件"
   }
 }