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

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

components/modes/liuyao-form.tsx

@@ -17,6 +17,7 @@ import RegionSelect, {
   useRegionLocation,
 } from "@/components/shared/region-select";
 import { streamAiCompletion } from "@/lib/ai/client-stream";
+import { saveHistoryEntry } from "@/lib/history/storage";
 import type { GuaResult } from "@/lib/calc/hexagram";
 import todayJson from "@/lib/data/today.json";
 
@@ -68,7 +69,7 @@ export default function LiuyaoForm() {
     setIsLoading(true);
 
     try {
-      await streamAiCompletion(
+      const text = await streamAiCompletion(
         {
           mode: "liuyao",
           payload: {
@@ -85,6 +86,18 @@ export default function LiuyaoForm() {
         },
         setCompletion,
       );
+      saveHistoryEntry({
+        mode: "liuyao",
+        title: guaData!.result.guaTitle,
+        question,
+        summary: guaData!.result.guaResult,
+        completion: text,
+        meta: {
+          地域: location!.name,
+          起卦时间: `${calcDate} ${calcTime}`,
+          卦象: guaData!.result.guaTitle,
+        },
+      });
     } catch (e) {
       setError(e instanceof Error ? e.message : String(e));
     } finally {
@@ -112,6 +125,11 @@ export default function LiuyaoForm() {
     setError("");
   }
 
+  const downloadPreamble =
+    guaData && location
+      ? `# 六爻算卦 AI 解读\n\n- 问事：${question}\n- 地域：${location.name}\n- 时间：${calcDate} ${calcTime}\n- 卦象：${guaData.result.guaTitle}\n`
+      : undefined;
+
   return (
     <ModeWorkspace
       aiPanel={
@@ -122,6 +140,12 @@ export default function LiuyaoForm() {
           onCompletion={handleAnalyze}
           error={error}
           emptyHint="完成起卦后，点击「AI 解读」"
+          downloadFilename={
+            completion && guaData
+              ? `六爻-${guaData.result.guaTitle.replace(/[/\\?%*:|"<>]/g, "-")}.md`
+              : undefined
+          }
+          downloadPreamble={downloadPreamble}
         />
       }
     >