fix(ui): 对齐图表末端与实时概览数据的精度，放开全量历史趋势查询限制

app/dashboard/page.tsx

@@ -109,7 +109,20 @@ export default function DashboardPage() {
   useEffect(() => {
     async function loadSnapshots() {
       await recordDailySnapshot();
-      const data = await getSnapshots({ limit: 30 });
+      const summary = await getPortfolioSummary();
+      const data = await getSnapshots();
+      const todayStr = new Date().toISOString().slice(0, 10);
+      const lastSnapshot = data[data.length - 1];
+      if (lastSnapshot && lastSnapshot.date === todayStr) {
+        lastSnapshot.totalValueCny = summary.totalCnyValue;
+        lastSnapshot.totalCostCny = summary.totalCnyValue;
+      } else {
+        data.push({
+          date: todayStr,
+          totalValueCny: summary.totalCnyValue,
+          totalCostCny: summary.totalCnyValue,
+        });
+      }
       setSnapshots(data);
     }
     loadSnapshots();
@@ -212,7 +225,7 @@ export default function DashboardPage() {
                   toast.dismiss();
                   if (result.success) {
                     toast.success(`重构成功，已填充 ${result.daysReconstructed} 天历史数据`);
-                    setSnapshots(await getSnapshots({ limit: 30 }));
+                    setSnapshots(await getSnapshots());
                   } else if (result.message) {
                     toast.info(result.message);
                   }