Add login gate, calculation history, and AI markdown download.

Co-authored-by: Cursor <cursoragent@cursor.com>

components/modes/combined-form.tsx

@@ -23,6 +23,7 @@ import RegionSelect, {
 import { calculateBazi, type BaziChart } from "@/lib/calc/bazi";
 import type { GuaResult } from "@/lib/calc/hexagram";
 import { streamAiCompletion } from "@/lib/ai/client-stream";
+import { saveHistoryEntry } from "@/lib/history/storage";
 
 export default function CombinedForm() {
   const [birthDate, setBirthDate] = useState(todaySolarYmd());
@@ -114,8 +115,18 @@ export default function CombinedForm() {
     setCompletion("");
     setIsLoading(true);
 
+    const activeChart =
+      chart ??
+      calculateBazi({
+        date: birthDate,
+        time: unknownHour ? "12:00" : birthTime,
+        gender,
+        longitude: birthLocation!.longitude,
+        unknownHour,
+      });
+
     try {
-      await streamAiCompletion(
+      const text = await streamAiCompletion(
         {
           mode: "combined",
           payload: {
@@ -144,6 +155,19 @@ export default function CombinedForm() {
         },
         setCompletion,
       );
+      saveHistoryEntry({
+        mode: "combined",
+        title: "综合测算解读",
+        question,
+        summary: activeChart.lunarDate,
+        completion: text,
+        meta: {
+          出生地域: birthLocation!.name,
+          当前地域: currentLocation!.name,
+          测算时间: `${calcDate} ${calcTime}`,
+          六爻: withHexagram && guaData ? guaData.result.guaTitle : "无",
+        },
+      });
     } catch (e) {
       setError(e instanceof Error ? e.message : String(e));
     } finally {
@@ -151,6 +175,11 @@ export default function CombinedForm() {
     }
   }
 
+  const downloadPreamble =
+    completion && birthLocation && currentLocation
+      ? `# 综合测算 AI 解读\n\n- 问事：${question}\n- 出生地域：${birthLocation.name}\n- 当前地域：${currentLocation.name}\n- 测算时间：${calcDate} ${calcTime}\n${chart ? `- 农历：${chart.lunarDate}\n` : ""}${withHexagram && guaData ? `- 六爻：${guaData.result.guaTitle}\n` : ""}`
+      : undefined;
+
   return (
     <ModeWorkspace
       aiTitle="综合解读"
@@ -162,6 +191,8 @@ export default function CombinedForm() {
           onCompletion={handleAnalyze}
           error={error}
           emptyHint="填写完整信息后，点击「综合测算」"
+          downloadFilename={completion ? "综合测算解读.md" : undefined}
+          downloadPreamble={downloadPreamble}
         />
       }
     >