fix: connect API to tracker.db via SQLite repository

apps/web/src/store/uiStore.ts

@@ -0,0 +1,32 @@
+/**
+ * UI 状态管理
+ * 管理全局 UI 状态（侧边栏、加载状态等）
+ */
+import { create } from 'zustand';
+
+interface UIState {
+  sidebarCollapsed: boolean;
+  loading: boolean;
+  
+  // Actions
+  toggleSidebar: () => void;
+  setSidebarCollapsed: (collapsed: boolean) => void;
+  setLoading: (loading: boolean) => void;
+}
+
+export const useUIStore = create<UIState>((set) => ({
+  sidebarCollapsed: false,
+  loading: false,
+
+  toggleSidebar: () => {
+    set((state) => ({ sidebarCollapsed: !state.sidebarCollapsed }));
+  },
+
+  setSidebarCollapsed: (collapsed) => {
+    set({ sidebarCollapsed: collapsed });
+  },
+
+  setLoading: (loading) => {
+    set({ loading });
+  },
+}));