refactor(sidebar): merge balance and user into unified card

tauri-app/src/components/Layout/Sidebar.css

@@ -167,17 +167,22 @@
   position: relative;
 }
 
+.sidebar-footer-card {
+  background: var(--bg-card);
+  border: 1px solid var(--border-light);
+  border-radius: var(--radius-lg);
+  overflow: hidden;
+}
+
 .sidebar-balance {
   display: flex;
   align-items: center;
   justify-content: center;
   gap: var(--spacing-xs);
   padding: var(--spacing-xs) var(--spacing-sm);
-  border-radius: var(--radius-md);
   cursor: pointer;
   transition: background var(--transition-fast);
-  background: var(--bg-card);
-  border: 1px solid var(--border-light);
+  border-bottom: 1px solid var(--border-light);
 }
 
 .sidebar-balance:hover {
@@ -196,7 +201,6 @@
   justify-content: center;
   gap: var(--spacing-sm);
   padding: var(--spacing-sm);
-  border-radius: var(--radius-md);
   cursor: pointer;
   transition: background var(--transition-fast);
 }

tauri-app/src/components/Layout/Sidebar.tsx

@@ -210,21 +210,22 @@ export default function Sidebar({ currentPath, onNavigate }: SidebarProps) {
         </div>
       )}
       <div className="sidebar-footer" ref={menuRef}>
-        <div
-          className="sidebar-balance"
-          onClick={() => onNavigate('profile')}
-          title="查看账户"
-        >
-          <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="#36b26a" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
-            <polygon points="13 2 3 14 12 14 11 22 21 10 12 10 13 2" />
-          </svg>
-          <span className="balance-text">{balance} 积分</span>
-        </div>
-        <div
-          className="sidebar-user"
-          onClick={() => setShowUserMenu(!showUserMenu)}
-          title="菜单"
-        >
+        <div className="sidebar-footer-card">
+          <div
+            className="sidebar-balance"
+            onClick={() => onNavigate('profile')}
+            title="查看账户"
+          >
+            <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="#36b26a" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
+              <polygon points="13 2 3 14 12 14 11 22 21 10 12 10 13 2" />
+            </svg>
+            <span className="balance-text">{balance} 积分</span>
+          </div>
+          <div
+            className="sidebar-user"
+            onClick={() => setShowUserMenu(!showUserMenu)}
+            title="菜单"
+          >
           <img
             src={authUser?.avatar || '/default-avatar.svg'}
             alt="avatar"
@@ -248,6 +249,7 @@ export default function Sidebar({ currentPath, onNavigate }: SidebarProps) {
             <polyline points="9 18 15 12 9 6" />
           </svg>
         </div>
+        </div>
         {showUserMenu && (
           <div className="user-dropdown-menu">
             {userMenuItems.map((item) => (