fix: decouple AI completion from history save failures and improve history API errors

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

components/modes/combined-form.tsx

@@ -23,7 +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";
+import { saveHistoryEntrySafe } from "@/lib/history/storage";
 
 export default function CombinedForm() {
   const [birthDate, setBirthDate] = useState(todaySolarYmd());
@@ -45,6 +45,7 @@ export default function CombinedForm() {
   const [chart, setChart] = useState<BaziChart | null>(null);
   const [completion, setCompletion] = useState("");
   const [error, setError] = useState("");
+  const [warning, setWarning] = useState("");
   const [isLoading, setIsLoading] = useState(false);
 
   const birthLocation = useRegionLocation(birthProvince, birthCity);
@@ -112,6 +113,7 @@ export default function CombinedForm() {
     }
 
     setError("");
+    setWarning("");
     setCompletion("");
     setIsLoading(true);
 
@@ -155,7 +157,7 @@ export default function CombinedForm() {
         },
         setCompletion,
       );
-      await saveHistoryEntry({
+      const saveResult = await saveHistoryEntrySafe({
         mode: "combined",
         title: "综合测算解读",
         question,
@@ -189,6 +191,9 @@ export default function CombinedForm() {
           六爻: withHexagram && guaData ? guaData.result.guaTitle : "无",
         },
       });
+      if (!saveResult.ok) {
+        setWarning(saveResult.error);
+      }
     } catch (e) {
       setError(e instanceof Error ? e.message : String(e));
     } finally {
@@ -211,6 +216,7 @@ export default function CombinedForm() {
           isLoading={isLoading}
           onCompletion={handleAnalyze}
           error={error}
+          warning={warning}
           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}