fix(ui): 账号详情页 pending 态页头保留返回入口；同步/编辑加空态防护（走查 P2-#9）

web/src/pages/accounts/$id/index.tsx

@@ -152,30 +152,30 @@ export default function Page() {
 
   // 页头 content 行右侧：返回/强制同步/编辑注册到 Layout 页头槽，不在卡片内重复渲染。
   usePageActions(
-    account ? (
-      <Space>
-        <Button onClick={() => history.push('/accounts')}>返回社媒账号</Button>
-        <Button
-          disabled={actionBusy}
-          onClick={async () => {
-            // 强制同步：后端复用账号自身运行环境采集，需已登录+环境就绪（否则 409/503 提示原因）。
-            setActionBusy(true);
-            try {
-              await creatorAction(`/creator/accounts/${encodeURIComponent(account.id)}/sync`);
-              messageApi.success('强制同步已执行。');
-              await loadAll();
-            } catch (actionError) {
-              messageApi.error(conflictMessage(actionError, '强制同步失败；账号需已登录且运行环境就绪。'));
-            } finally {
-              setActionBusy(false);
-            }
-          }}
-        >
-          强制同步
-        </Button>
-        <Button type="primary" onClick={() => history.push(`/accounts/${account.id}/edit`)}>编辑账号</Button>
-      </Space>
-    ) : null,
+    <Space>
+      <Button onClick={() => history.push('/accounts')}>返回社媒账号</Button>
+      <Button
+        disabled={actionBusy || !account}
+        onClick={async () => {
+          // 强制同步：后端复用账号自身运行环境采集，需已登录+环境就绪（否则 409/503 提示原因）。
+          setActionBusy(true);
+          try {
+            await creatorAction(`/creator/accounts/${encodeURIComponent(account.id)}/sync`);
+            messageApi.success('强制同步已执行。');
+            await loadAll();
+          } catch (actionError) {
+            messageApi.error(conflictMessage(actionError, '强制同步失败；账号需已登录且运行环境就绪。'));
+          } finally {
+            setActionBusy(false);
+          }
+        }}
+      >
+        强制同步
+      </Button>
+      <Button type="primary" disabled={!account} onClick={() => account && history.push(`/accounts/${account.id}/edit`)}>
+        编辑账号
+      </Button>
+    </Space>,
     [account?.id],
   );
 

web/src/pages/accounts/monitoring/$id/index.tsx

@@ -87,49 +87,49 @@ export default function Page() {
   );
 
   usePageActions(
-    competitor ? (
-      <Space>
-        <Button onClick={() => history.push('/accounts/monitoring')}>返回监控账号</Button>
-        <Button
-          disabled={actionBusy || !competitor.enabled}
-          onClick={async () => {
-            // 强制同步：后端用临时匿名浏览器采集公开作品，无需自有账号身份。
-            setActionBusy(true);
-            try {
-              await creatorAction(`/creator/competitors/${encodeURIComponent(competitor.id)}/sync`);
-              messageApi.success('强制同步已执行。');
-              await loadCompetitor();
-            } catch (actionError) {
-              messageApi.error(conflictMessage(actionError, '强制同步失败'));
-            } finally {
-              setActionBusy(false);
-            }
-          }}
-        >
-          强制同步
-        </Button>
-        <Button
-          type="primary"
-          disabled={actionBusy}
-          onClick={async () => {
-            setActionBusy(true);
-            try {
-              await creatorAction(
-                `/creator/competitors/${encodeURIComponent(competitor.id)}/${competitor.enabled ? 'pause' : 'resume'}`,
-              );
-              messageApi.success(competitor.enabled ? '监测账号已暂停。' : '监测账号已恢复。');
-              await loadCompetitor();
-            } catch (actionError) {
-              messageApi.error(conflictMessage(actionError, '监测账号状态更新失败'));
-            } finally {
-              setActionBusy(false);
-            }
-          }}
-        >
-          {competitor.enabled ? '暂停监控' : '恢复监控'}
-        </Button>
-      </Space>
-    ) : null,
+    <Space>
+      <Button onClick={() => history.push('/accounts/monitoring')}>返回监控账号</Button>
+      <Button
+        disabled={actionBusy || !competitor}
+        onClick={async () => {
+          // 强制同步：后端用临时匿名浏览器采集公开作品，无需自有账号身份。
+          if (!competitor) return;
+          setActionBusy(true);
+          try {
+            await creatorAction(`/creator/competitors/${encodeURIComponent(competitor.id)}/sync`);
+            messageApi.success('强制同步已执行。');
+            await loadCompetitor();
+          } catch (actionError) {
+            messageApi.error(conflictMessage(actionError, '强制同步失败'));
+          } finally {
+            setActionBusy(false);
+          }
+        }}
+      >
+        强制同步
+      </Button>
+      <Button
+        type="primary"
+        disabled={actionBusy || !competitor}
+        onClick={async () => {
+          if (!competitor) return;
+          setActionBusy(true);
+          try {
+            await creatorAction(
+              `/creator/competitors/${encodeURIComponent(competitor.id)}/${competitor.enabled ? 'pause' : 'resume'}`,
+            );
+            messageApi.success(competitor.enabled ? '监测账号已暂停。' : '监测账号已恢复。');
+            await loadCompetitor();
+          } catch (actionError) {
+            messageApi.error(conflictMessage(actionError, '监测账号状态更新失败'));
+          } finally {
+            setActionBusy(false);
+          }
+        }}
+      >
+        {competitor ? (competitor.enabled ? '暂停监控' : '恢复监控') : '暂停监控'}
+      </Button>
+    </Space>,
     [competitor?.id, competitor?.enabled],
   );