feat(ui): improve settings page UX and responsiveness

- Add mobile-responsive layout for settings panels

- Add empty state UI for websearch providers

- Improve connection indicator with WebSocket status

ui/src/components/shared/connection-indicator.tsx

@@ -1,19 +1,29 @@
 /**
  * Connection Indicator (Phase 04)
  *
- * Shows WebSocket connection status in the header.
+ * Shows WebSocket connection status in the header with reconnection state.
  */
 
-import { Wifi, WifiOff } from 'lucide-react';
+import { Wifi, WifiOff, RefreshCw } from 'lucide-react';
 import { useWebSocket } from '@/hooks/use-websocket';
 
 export function ConnectionIndicator() {
-  const { status } = useWebSocket();
+  const { status, isReconnecting } = useWebSocket();
 
   const statusConfig = {
     connected: { icon: Wifi, color: 'text-green-600', label: 'Connected' },
-    connecting: { icon: Wifi, color: 'text-yellow-500', label: 'Connecting...' },
-    disconnected: { icon: WifiOff, color: 'text-red-500', label: 'Disconnected' },
+    connecting: {
+      icon: RefreshCw,
+      color: 'text-yellow-500',
+      label: 'Connecting...',
+      animate: true,
+    },
+    disconnected: {
+      icon: isReconnecting ? RefreshCw : WifiOff,
+      color: isReconnecting ? 'text-amber-500' : 'text-red-500',
+      label: isReconnecting ? 'Reconnecting...' : 'Disconnected',
+      animate: isReconnecting,
+    },
   };
 
   const config = statusConfig[status];
@@ -21,7 +31,7 @@ export function ConnectionIndicator() {
 
   return (
     <div className={`flex items-center gap-1 text-sm ${config.color}`}>
-      <Icon className="w-4 h-4" />
+      <Icon className={`w-4 h-4 ${config.animate ? 'animate-spin' : ''}`} />
       <span className="hidden sm:inline">{config.label}</span>
     </div>
   );

ui/src/hooks/use-websocket.ts

@@ -18,6 +18,7 @@ type ConnectionStatus = 'connecting' | 'connected' | 'disconnected';
 
 export function useWebSocket() {
   const [status, setStatus] = useState<ConnectionStatus>('disconnected');
+  const [isReconnecting, setIsReconnecting] = useState(false);
   const wsRef = useRef<WebSocket | null>(null);
   const queryClient = useQueryClient();
   const reconnectAttempts = useRef(0);
@@ -75,6 +76,7 @@ export function useWebSocket() {
 
     ws.onopen = () => {
       setStatus('connected');
+      setIsReconnecting(false);
       reconnectAttempts.current = 0;
       console.log('[WS] Connected');
     };
@@ -97,6 +99,7 @@ export function useWebSocket() {
 
       // Attempt reconnect with exponential backoff
       if (reconnectAttempts.current < maxReconnectAttempts) {
+        setIsReconnecting(true);
         const delay = Math.min(1000 * Math.pow(2, reconnectAttempts.current), 30000);
         reconnectAttempts.current++;
         console.log(`[WS] Reconnecting in ${delay}ms (attempt ${reconnectAttempts.current})`);
@@ -104,6 +107,8 @@ export function useWebSocket() {
         reconnectTimeoutRef.current = setTimeout(() => {
           connectRef.current();
         }, delay);
+      } else {
+        setIsReconnecting(false);
       }
     };
 
@@ -117,6 +122,7 @@ export function useWebSocket() {
 
   const disconnect = useCallback(() => {
     reconnectAttempts.current = maxReconnectAttempts; // Prevent reconnect
+    setIsReconnecting(false);
     if (reconnectTimeoutRef.current) {
       clearTimeout(reconnectTimeoutRef.current);
       reconnectTimeoutRef.current = null;
@@ -142,5 +148,8 @@ export function useWebSocket() {
     return () => clearInterval(interval);
   }, []);
 
-  return useMemo(() => ({ status, connect, disconnect }), [status, connect, disconnect]);
+  return useMemo(
+    () => ({ status, isReconnecting, connect, disconnect }),
+    [status, isReconnecting, connect, disconnect]
+  );
 }

ui/src/pages/settings/index.tsx

@@ -115,7 +115,25 @@ function SettingsPageInner() {
 
   return (
     <div className="h-[calc(100vh-100px)]">
-      <PanelGroup direction="horizontal" className="h-full">
+      {/* Mobile View - Stacked vertically */}
+      <div className="md:hidden h-full flex flex-col">
+        <div className="border-b bg-background p-4">
+          <TabNavigation activeTab={activeTab} onTabChange={handleTabChange} />
+        </div>
+        <SectionErrorBoundary>
+          <Suspense fallback={<SectionSkeleton />}>
+            {activeTab === 'websearch' && <WebSearchSection />}
+            {activeTab === 'globalenv' && <GlobalEnvSection />}
+            {activeTab === 'thinking' && <ThinkingSection />}
+            {activeTab === 'proxy' && <ProxySection />}
+            {activeTab === 'auth' && <AuthSection />}
+            {activeTab === 'backups' && <BackupsSection />}
+          </Suspense>
+        </SectionErrorBoundary>
+      </div>
+
+      {/* Desktop View - Side-by-side panels */}
+      <PanelGroup direction="horizontal" className="h-full hidden md:flex">
         {/* Left Panel - Settings Controls */}
         <Panel defaultSize={40} minSize={30} maxSize={55}>
           <div className="h-full border-r flex flex-col bg-muted/30 relative">

ui/src/pages/settings/sections/websearch/index.tsx

@@ -7,7 +7,7 @@ import { useState, useEffect } from 'react';
 import { Button } from '@/components/ui/button';
 import { Alert, AlertDescription } from '@/components/ui/alert';
 import { ScrollArea } from '@/components/ui/scroll-area';
-import { RefreshCw, CheckCircle2, AlertCircle } from 'lucide-react';
+import { RefreshCw, CheckCircle2, AlertCircle, Package } from 'lucide-react';
 import { useWebSearchConfig, useRawConfig } from '../../hooks';
 import { ProviderCard } from './provider-card';
 
@@ -141,6 +141,21 @@ export default function WebSearchSection() {
           <div className="space-y-3">
             <h3 className="text-base font-medium">Providers</h3>
 
+            {/* Empty state when no providers available */}
+            {!status?.geminiCli && !status?.opencodeCli && !status?.grokCli && !statusLoading && (
+              <div className="flex flex-col items-center justify-center p-8 border-2 border-dashed rounded-lg text-center bg-muted/30">
+                <Package className="w-12 h-12 text-muted-foreground mb-3 opacity-30" />
+                <p className="font-medium text-foreground mb-1">No providers configured</p>
+                <p className="text-sm text-muted-foreground mb-4">
+                  Install CLI tools to enable web search providers
+                </p>
+                <Button variant="outline" size="sm" onClick={fetchStatus}>
+                  <RefreshCw className="w-4 h-4 mr-2" />
+                  Check for providers
+                </Button>
+              </div>
+            )}
+
             <ProviderCard
               name="gemini"
               label="Google Gemini CLI (1000 req/day free)"