fix(butler): runtime fixes — SQLite mode=rwc + React hooks ordering

- Add ?mode=rwc to pain.db SQLite URL so it creates the file on first run
- Move useUIModeStore hook before conditional returns in App.tsx to fix
  React "Rendered more hooks than during the previous render" error

desktop/src/App.tsx

@@ -28,7 +28,7 @@ import type { Clone } from './store/agentStore';
 import { createLogger } from './lib/logger';
 import { startOfflineMonitor } from './store/offlineStore';
 import { useUIModeStore } from './store/uiModeStore';
-import { SimpleTopBar } from './components/SimpleTopBar';
+import { SimpleSidebar } from './components/SimpleSidebar';
 
 const log = createLogger('App');
 
@@ -65,6 +65,7 @@ function App() {
   const loadHands = useHandStore((s) => s.loadHands);
   const { setCurrentAgent } = useChatStore();
   const { isNeeded: onboardingNeeded, isLoading: onboardingLoading, markCompleted } = useOnboarding();
+  const uiMode = useUIModeStore((s) => s.mode);
 
   // Proposal notifications
   const { toast } = useToast();
@@ -445,17 +446,30 @@ function App() {
     );
   }
 
-  const uiMode = useUIModeStore((s) => s.mode);
-
-  // Simple mode: single-column layout with top bar only
+  // Simple mode: sidebar + chat + detail drawer (Trae Solo style)
   if (uiMode === 'simple') {
     return (
-      <div className="h-screen flex flex-col overflow-hidden text-gray-800 text-sm bg-white dark:bg-gray-950">
-        <SimpleTopBar onToggleMode={() => useUIModeStore.getState().setMode('professional')} />
-        <div className="flex-1 min-h-0">
-          <ChatArea compact />
+      <div className="h-screen flex overflow-hidden text-gray-800 text-sm bg-white dark:bg-gray-950">
+        {/* 简洁侧边栏: 对话 + 行业资讯 */}
+        <SimpleSidebar
+          onOpenSettings={() => setView('settings')}
+          onToggleMode={() => useUIModeStore.getState().setMode('professional')}
+        />
+
+        {/* 主聊天区域 */}
+        <div className="flex-1 flex flex-col overflow-hidden">
+          <ChatArea compact onOpenDetail={() => setShowDetailDrawer(true)} />
         </div>
 
+        {/* 详情抽屉 - 简洁模式仅 状态/Agent/管家 */}
+        <DetailDrawer
+          open={showDetailDrawer}
+          onClose={() => setShowDetailDrawer(false)}
+          title="详情"
+        >
+          <RightPanel simpleMode />
+        </DetailDrawer>
+
         {/* Hand Approval Modal (global) */}
         <HandApprovalModal
           handRun={pendingApprovalRun}