feat: 重构侧栏布局，优化用户菜单和同步功能

frontend/src/pages/AlphaPage.tsx

@@ -479,60 +479,6 @@ export function AlphaPage({
     account?.connection_status === "expired";
   return (
     <>
-      <div className="page-heading">
-        <div>
-          <h1>Alpha 管理</h1>
-        </div>
-        <div className="inline-actions">
-          <Button type="tertiary" onClick={() => setImporting(true)}>
-            导入 Alpha ID
-          </Button>
-          <Button
-            theme="solid"
-            disabled={!connected}
-            onClick={() => {
-              setSyncingScope(submission);
-              onOverlay();
-            }}
-          >
-            按天同步
-          </Button>
-          {submission === "SUBMITTED" && (
-            <Button
-              loading={busy === "full_sync"}
-              disabled={!connected}
-              onClick={() => void newTask("full_sync")}
-            >
-              全量同步已提交
-            </Button>
-          )}
-        </div>
-      </div>
-      <div className="library-stats">
-        <div>
-          <span>已同步 Alpha</span>
-          <strong>{Number(facets.total ?? 0).toLocaleString()}</strong>
-        </div>
-        <div>
-          <span>我的收藏</span>
-          <strong>{Number(facets.favorites ?? 0).toLocaleString()}</strong>
-        </div>
-        <div>
-          <span>覆盖地区</span>
-          <strong>
-            {Array.isArray(facets.region) ? facets.region.length : 0}
-          </strong>
-        </div>
-        <div className="last-sync">
-          <span>最近数据更新</span>
-          <strong>
-            {formatTime(
-              typeof facets.last_sync === "string" ? facets.last_sync : null,
-              account?.timezone,
-            )}
-          </strong>
-        </div>
-      </div>
       {!connected && (
         <Banner
           type="info"
@@ -548,15 +494,26 @@ export function AlphaPage({
       )}
       {error && <Banner type="danger" description={error} />}
       <section className="library-panel" ref={tablePanel}>
-        <Tabs
-          className="alpha-submission-tabs"
-          activeKey={submission}
-          onChange={changeSubmission}
-          tabList={[
-            { itemKey: "UNSUBMITTED", tab: "待提交" },
-            { itemKey: "SUBMITTED", tab: "已提交" },
-          ]}
-        />
+        <div className="alpha-tabs-header">
+          <Tabs
+            className="alpha-submission-tabs"
+            activeKey={submission}
+            onChange={changeSubmission}
+            tabList={[
+              { itemKey: "UNSUBMITTED", tab: "待提交" },
+              { itemKey: "SUBMITTED", tab: "已提交" },
+            ]}
+          />
+          <span className="alpha-last-sync">
+            最近数据更新{" "}
+            <span>
+              {formatTime(
+                typeof facets.last_sync === "string" ? facets.last_sync : null,
+                account?.timezone,
+              )}
+            </span>
+          </span>
+        </div>
         <SavedViews
           filters={{ ...filters, submission, sort, direction, limit: pageSize }}
           columns={visibleColumns}
@@ -856,6 +813,34 @@ export function AlphaPage({
                 导出
               </Button>
             </a>
+            <Button
+              size="small"
+              type="tertiary"
+              onClick={() => setImporting(true)}
+            >
+              导入 Alpha ID
+            </Button>
+            <Button
+              size="small"
+              theme="solid"
+              disabled={!connected}
+              onClick={() => {
+                setSyncingScope(submission);
+                onOverlay();
+              }}
+            >
+              按天同步
+            </Button>
+            {submission === "SUBMITTED" && (
+              <Button
+                size="small"
+                loading={busy === "full_sync"}
+                disabled={!connected}
+                onClick={() => void newTask("full_sync")}
+              >
+                全量同步已提交
+              </Button>
+            )}
             <Popover
               trigger="click"
               position="bottomRight"