Feat/auto failover (#367)

* feat(db): add circuit breaker config table and provider proxy target APIs

Add database support for auto-failover feature:

- Add circuit_breaker_config table for storing failover thresholds
- Add get/update_circuit_breaker_config methods in proxy DAO
- Add reset_provider_health method for manual recovery
- Add set_proxy_target and get_proxy_targets methods in providers DAO
  for managing multi-provider failover configuration

* feat(proxy): implement circuit breaker and provider router for auto-failover

Add core failover logic:

- CircuitBreaker: Tracks provider health with three states:
  - Closed: Normal operation, requests pass through
  - Open: Circuit broken after consecutive failures, skip provider
  - HalfOpen: Testing recovery with limited requests
- ProviderRouter: Routes requests across multiple providers with:
  - Health tracking and automatic failover
  - Configurable failure/success thresholds
  - Auto-disable proxy target after reaching failure threshold
  - Support for manual circuit breaker reset
- Export new types in proxy module

* feat(proxy): add failover Tauri commands and integrate with forwarder

Expose failover functionality to frontend:

- Add Tauri commands: get_proxy_targets, set_proxy_target,
  get_provider_health, reset_circuit_breaker,
  get/update_circuit_breaker_config, get_circuit_breaker_stats
- Register all new commands in lib.rs invoke handler
- Update forwarder with improved error handling and logging
- Integrate ProviderRouter with proxy server startup
- Add provider health tracking in request handlers

* feat(frontend): add failover API layer and TanStack Query hooks

Add frontend data layer for failover management:

- Add failover.ts API: Tauri invoke wrappers for all failover commands
- Add failover.ts query hooks: TanStack Query mutations and queries
  - useProxyTargets, useProviderHealth queries
  - useSetProxyTarget, useResetCircuitBreaker mutations
  - useCircuitBreakerConfig query and mutation
- Update queries.ts with provider health query key
- Update mutations.ts to invalidate health on provider changes
- Add CircuitBreakerConfig and ProviderHealth types

* feat(ui): add auto-failover configuration UI and provider health display

Add comprehensive UI for failover management:

Components:
- ProviderHealthBadge: Display provider health status with color coding
- CircuitBreakerConfigPanel: Configure failure/success thresholds,
  timeout duration, and error rate limits
- AutoFailoverConfigPanel: Manage proxy targets with drag-and-drop
  priority ordering and individual enable/disable controls
- ProxyPanel: Integrate failover tabs for unified proxy management

Provider enhancements:
- ProviderCard: Show health badge and proxy target indicator
- ProviderActions: Add "Set as Proxy Target" action
- EditProviderDialog: Add is_proxy_target toggle
- ProviderList: Support proxy target filtering mode

Other:
- Update App.tsx routing for settings integration
- Update useProviderActions hook with proxy target mutation
- Fix ProviderList tests for updated component API

* fix(usage): stabilize date range to prevent infinite re-renders

* feat(backend): add tool version check command

Add get_tool_versions command to check local and latest versions of
Claude, Codex, and Gemini CLI tools:

- Detect local installed versions via command line execution
- Fetch latest versions from npm registry (Claude, Gemini)
  and GitHub releases API (Codex)
- Return comprehensive version info including error details
  for uninstalled tools
- Register command in Tauri invoke handler

* style(ui): format accordion component code style

Apply consistent code formatting to accordion component:
- Convert double quotes to semicolons at line endings
- Adjust indentation to 2-space standard
- Align with project code style conventions

* refactor(providers): update provider card styling to use theme tokens

Replace hardcoded color classes with semantic design tokens:
- Use bg-card, border-border, text-card-foreground instead of glass-card
- Replace gray/white color literals with muted/foreground tokens
- Change proxy target indicator color from purple to green
- Improve hover states with border-border-active
- Ensure consistent dark mode support via CSS variables

* refactor(proxy): simplify auto-failover config panel structure

Restructure AutoFailoverConfigPanel for better integration:
- Remove internal Card wrapper and expansion toggle (now handled by parent)
- Extract enabled state to props for external control
- Simplify loading state display
- Clean up redundant CardHeader/CardContent wrappers
- ProxyPanel: reduce complexity by delegating to parent components

* feat(settings): enhance settings page with accordion layout and tool versions

Major settings page improvements:

AboutSection:
- Add local tool version detection (Claude, Codex, Gemini)
- Display installed vs latest version comparison with visual indicators
- Show update availability badges and environment check cards

SettingsPage:
- Reorganize advanced settings into collapsible accordion sections
- Add proxy control panel with inline status toggle
- Integrate auto-failover configuration with accordion UI
- Add database and cost calculation config sections

DirectorySettings & WindowSettings:
- Minor styling adjustments for consistency

settings.ts API:
- Add getToolVersions() wrapper for new backend command

* refactor(usage): restructure usage dashboard components

Comprehensive usage statistics panel refactoring:

UsageDashboard:
- Reorganize layout with improved section headers
- Add better loading states and empty state handling

ModelStatsTable & ProviderStatsTable:
- Minor styling updates for consistency

ModelTestConfigPanel & PricingConfigPanel:
- Simplify component structure
- Remove redundant Card wrappers
- Improve form field organization

RequestLogTable:
- Enhance table layout with better column sizing
- Improve pagination controls

UsageSummaryCards:
- Update card styling with semantic tokens
- Better responsive grid layout

UsageTrendChart:
- Refine chart container styling
- Improve legend and tooltip display

* chore(deps): add accordion and animation dependencies

Package updates:
- Add @radix-ui/react-accordion for collapsible sections
- Add cmdk for command palette support
- Add framer-motion for enhanced animations

Tailwind config:
- Add accordion-up/accordion-down animations
- Update darkMode config to support both selector and class
- Reorganize color and keyframe definitions for clarity

* style(app): update header and app switcher styling

App.tsx:
- Replace glass-header with explicit bg-background/80 backdrop-blur
- Update navigation button container to use bg-muted

AppSwitcher:
- Replace hardcoded gray colors with semantic muted/foreground tokens
- Ensure consistent dark mode support via CSS variables
- Add group class for better hover state transitions

src/components/providers/EditProviderDialog.tsx

@@ -33,13 +33,23 @@ export function EditProviderDialog({
     unknown
   > | null>(null);
 
+  // 使用 ref 标记是否已经加载过，防止重复读取覆盖用户编辑
+  const [hasLoadedLive, setHasLoadedLive] = useState(false);
+
   useEffect(() => {
     let cancelled = false;
     const load = async () => {
       if (!open || !provider) {
         setLiveSettings(null);
+        setHasLoadedLive(false);
         return;
       }
+
+      // 关键修复：只在首次打开时加载一次
+      if (hasLoadedLive) {
+        return;
+      }
+
       try {
         const currentId = await providersApi.getCurrent(appId);
         if (currentId && provider.id === currentId) {
@@ -49,13 +59,20 @@ export function EditProviderDialog({
             )) as Record<string, unknown>;
             if (!cancelled && live && typeof live === "object") {
               setLiveSettings(live);
+              setHasLoadedLive(true);
             }
           } catch {
             // 读取实时配置失败则回退到 SSOT（不打断编辑流程）
-            if (!cancelled) setLiveSettings(null);
+            if (!cancelled) {
+              setLiveSettings(null);
+              setHasLoadedLive(true);
+            }
           }
         } else {
-          if (!cancelled) setLiveSettings(null);
+          if (!cancelled) {
+            setLiveSettings(null);
+            setHasLoadedLive(true);
+          }
         }
       } finally {
         // no-op
@@ -65,14 +82,33 @@ export function EditProviderDialog({
     return () => {
       cancelled = true;
     };
-  }, [open, provider, appId]);
+  }, [open, provider?.id, appId, hasLoadedLive]); // 只依赖 provider.id，不依赖整个 provider 对象
 
   const initialSettingsConfig = useMemo(() => {
     return (liveSettings ?? provider?.settingsConfig ?? {}) as Record<
       string,
       unknown
     >;
-  }, [liveSettings, provider]);
+  }, [liveSettings, provider?.settingsConfig]); // 只依赖 settingsConfig，不依赖整个 provider
+
+  // 固定 initialData，防止 provider 对象更新时重置表单
+  const initialData = useMemo(() => {
+    if (!provider) return null;
+    return {
+      name: provider.name,
+      notes: provider.notes,
+      websiteUrl: provider.websiteUrl,
+      settingsConfig: initialSettingsConfig,
+      category: provider.category,
+      meta: provider.meta,
+      icon: provider.icon,
+      iconColor: provider.iconColor,
+    };
+  }, [
+    provider?.id, // 只依赖 ID，provider 对象更新不会触发重新计算
+    initialSettingsConfig,
+    // 注意：不依赖 provider 的其他字段，防止表单重置
+  ]);
 
   const handleSubmit = useCallback(
     async (values: ProviderFormValues) => {
@@ -104,7 +140,7 @@ export function EditProviderDialog({
     [onSubmit, onOpenChange, provider],
   );
 
-  if (!provider) {
+  if (!provider || !initialData) {
     return null;
   }
 
@@ -130,17 +166,7 @@ export function EditProviderDialog({
         submitLabel={t("common.save")}
         onSubmit={handleSubmit}
         onCancel={() => onOpenChange(false)}
-        initialData={{
-          name: provider.name,
-          notes: provider.notes,
-          websiteUrl: provider.websiteUrl,
-          // 若读取到实时配置则优先使用
-          settingsConfig: initialSettingsConfig,
-          category: provider.category,
-          meta: provider.meta,
-          icon: provider.icon,
-          iconColor: provider.iconColor,
-        }}
+        initialData={initialData}
         showButtons={false}
       />
     </FullScreenPanel>