fix(desktop): 功能验证 6 项缺陷修复

- ISS-002: SkillInfoResponse 增加 source/path 字段，修复技能系统显示 0 个
- ISS-003: Sidebar 添加自动化/技能市场导航入口 + App 返回按钮
- ISS-004: SaaS fetchAvailableModels 添加 .catch() 防限流崩溃
- ISS-006: SaaSSettings/PricingPage 包裹 ErrorBoundary 防白屏
- ISS-008: listModels 加载 localStorage 自定义模型，修复仅显示 1 个模型
- configStore listSkills 映射添加 source/path 转发

desktop/src/components/SaaS/SaaSStatus.tsx

@@ -23,7 +23,9 @@ export function SaaSStatus({ isLoggedIn, account, saasUrl, onLogout, onLogin }:
 
   useEffect(() => {
     if (isLoggedIn) {
-      fetchAvailableModels();
+      fetchAvailableModels().catch(() => {
+        // Silently handle SaaS API errors — they should not crash the app
+      });
     }
   }, [isLoggedIn, fetchAvailableModels]);
 

desktop/src/components/Settings/SettingsLayout.tsx

@@ -41,6 +41,7 @@ import { SecureStorage } from './SecureStorage';
 import { VikingPanel } from '../VikingPanel';
 import { SaaSSettings } from '../SaaS/SaaSSettings';
 import { PricingPage } from '../SaaS/PricingPage';
+import { ErrorBoundary } from '../ui/ErrorBoundary';
 
 interface SettingsLayoutProps {
   onBack: () => void;
@@ -105,8 +106,20 @@ export function SettingsLayout({ onBack }: SettingsLayoutProps) {
       case 'workspace': return <Workspace />;
       case 'privacy': return <Privacy />;
       case 'storage': return <SecureStorage />;
-      case 'saas': return <SaaSSettings />;
-      case 'billing': return <PricingPage />;
+      case 'saas': return (
+        <ErrorBoundary
+          fallback={<div className="p-6 text-center text-gray-500">SaaS 平台加载失败，请稍后重试</div>}
+        >
+          <SaaSSettings />
+        </ErrorBoundary>
+      );
+      case 'billing': return (
+        <ErrorBoundary
+          fallback={<div className="p-6 text-center text-gray-500">计费信息加载失败，请稍后重试</div>}
+        >
+          <PricingPage />
+        </ErrorBoundary>
+      );
       case 'security': return (
         <div className="space-y-6">
           <div>

desktop/src/components/Sidebar.tsx

@@ -1,7 +1,7 @@
 import { useState } from 'react';
 import { motion, AnimatePresence } from 'framer-motion';
 import {
-  SquarePen, MessageSquare, Bot, Search, X, Settings
+  SquarePen, MessageSquare, Bot, Search, X, Settings, Zap, Sparkles
 } from 'lucide-react';
 import { ConversationList } from './ConversationList';
 import { CloneManager } from './CloneManager';
@@ -33,11 +33,7 @@ export function Sidebar({
 
   const handleNavClick = (tab: Tab) => {
     setActiveTab(tab);
-    if (tab === 'clones') {
-      onMainViewChange?.('chat');
-    } else {
-      onMainViewChange?.('chat');
-    }
+    onMainViewChange?.('chat');
   };
 
   return (
@@ -85,6 +81,24 @@ export function Sidebar({
           <Bot className="w-4 h-4" />
           智能体
         </button>
+
+        {/* Divider between primary nav and secondary tools */}
+        <div className="mx-1 my-1 border-t border-[#e8e6e1]/40 dark:border-gray-800" />
+
+        <button
+          onClick={() => onMainViewChange?.('automation')}
+          className="w-full flex items-center gap-3 px-3 py-2 rounded-lg text-sm text-gray-600 dark:text-gray-400 hover:bg-black/5 dark:hover:bg-white/5 transition-colors"
+        >
+          <Zap className="w-4 h-4" />
+          自动化
+        </button>
+        <button
+          onClick={() => onMainViewChange?.('skills')}
+          className="w-full flex items-center gap-3 px-3 py-2 rounded-lg text-sm text-gray-600 dark:text-gray-400 hover:bg-black/5 dark:hover:bg-white/5 transition-colors"
+        >
+          <Sparkles className="w-4 h-4" />
+          技能市场
+        </button>
       </div>
 
       {/* Divider */}