refactor(sidebar): remove lightning icon, adjust avatar/text layout

- Remove lightning bolt SVG from balance display
- Increase avatar size (32px -> 36px)
- Tighten nickname/balance spacing in user-info
- Adjust user-name font weight (500 -> 600) and size (var(--font-sm) -> 14px)
- Reduce sidebar-user justify-content: center -> default (flex-start)

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

@@ -174,31 +174,18 @@
   overflow: hidden;
 }
 
-.sidebar-balance-inline {
-  display: flex;
-  align-items: center;
-  gap: var(--spacing-xs);
-  margin-top: 2px;
-  cursor: pointer;
-  transition: opacity var(--transition-fast);
-}
-
-.sidebar-balance-inline:hover {
-  opacity: 0.8;
-}
-
-.sidebar-balance-inline .balance-text {
+.sidebar-balance-text {
   font-size: 12px;
   font-weight: 600;
   color: var(--primary);
+  margin-top: 2px;
 }
 
 .sidebar-user {
   display: flex;
   align-items: center;
-  justify-content: center;
   gap: var(--spacing-sm);
-  padding: var(--spacing-sm);
+  padding: var(--spacing-sm) var(--spacing-md);
   cursor: pointer;
   transition: background var(--transition-fast);
 }
@@ -208,8 +195,8 @@
 }
 
 .user-avatar {
-  width: 32px;
-  height: 32px;
+  width: 36px;
+  height: 36px;
   border-radius: var(--radius-full);
   background: var(--primary-gradient);
   color: var(--text-inverse);
@@ -226,11 +213,12 @@
   flex-direction: column;
   min-width: 0;
   flex: 1;
+  gap: 1px;
 }
 
 .user-name {
-  font-size: var(--font-sm);
-  font-weight: 500;
+  font-size: 14px;
+  font-weight: 600;
   color: var(--text-primary);
   white-space: nowrap;
   overflow: hidden;

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

@@ -224,16 +224,7 @@ export default function Sidebar({ currentPath, onNavigate }: SidebarProps) {
             />
             <div className="user-info">
               <span className="user-name">{authUser?.nickname || '用户'}</span>
-              <div
-                className="sidebar-balance-inline"
-                onClick={(e) => { e.stopPropagation(); 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>
+              <span className="sidebar-balance-text">{balance} 积分</span>
             </div>
             <svg
               className={`user-chevron ${showUserMenu ? 'expanded' : ''}`}