feat：新增同步按钮

app/page.jsx

@@ -3716,6 +3716,26 @@ export default function HomePage() {
                         </div>
                       </div>
                       <div className="user-menu-divider" />
+                      <button
+                        className="user-menu-item"
+                        disabled={isSyncing}
+                        onClick={async () => {
+                          setUserMenuOpen(false);
+                          if (user?.id) await syncUserConfig(user.id);
+                        }}
+                        title="手动同步配置到云端"
+                      >
+                        {isSyncing ? (
+                          <span className="loading-spinner" style={{ width: 16, height: 16, border: '2px solid var(--muted)', borderTopColor: 'var(--primary)', borderRadius: '50%', animation: 'spin 1s linear infinite', flexShrink: 0 }} />
+                        ) : (
+                          <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" style={{ flexShrink: 0 }}>
+                            <path d="M4 14.899A7 7 0 1 1 15.71 8h1.79a4.5 4.5 0 0 1 2.5 8.242" stroke="var(--primary)" />
+                            <path d="M12 12v9" stroke="var(--accent)" />
+                            <path d="m16 16-4-4-4 4" stroke="var(--accent)" />
+                          </svg>
+                        )}
+                        <span>{isSyncing ? '同步中...' : '同步'}</span>
+                      </button>
                       <button
                         className="user-menu-item"
                         onClick={() => {