misc: provider icons, tooltip in chat toolbar, conditionally display the "Open Skills Folder" button and update "Documentation" to "Website" in settings (#60)

src/i18n/locales/zh/chat.json

@@ -9,5 +9,11 @@
         "creativeTasks": "创意任务",
         "creativeTasksDesc": "写作、头脑风暴、创意"
     },
-    "noLogs": "（暂无日志）"
+    "noLogs": "（暂无日志）",
+    "toolbar": {
+        "newSession": "新会话",
+        "refresh": "刷新聊天",
+        "showThinking": "显示思考过程",
+        "hideThinking": "隐藏思考过程"
+    }
 }

src/i18n/locales/zh/settings.json

@@ -128,7 +128,7 @@
         "tagline": "图形化 AI 助手",
         "basedOn": "基于 OpenClaw",
         "version": "版本 {{version}}",
-        "docs": "文档",
+        "docs": "官网",
         "github": "GitHub"
     }
 }

src/i18n/locales/zh/skills.json

@@ -56,7 +56,8 @@
         "failedSave": "保存配置失败",
         "failedOpenFolder": "无法打开技能文件夹",
         "failedInstall": "安装失败",
-        "failedUninstall": "卸载失败"
+        "failedUninstall": "卸载失败",
+        "failedFolderNotFound": "技能文件夹尚不存在，请先安装一个技能。"
     },
     "marketplace": {
         "title": "市场",