fix(rectification): host-fallback empty evidence turns and choice range narration (BUG-633, BUG-634)

Evidence turns that already recorded a batch no longer fail the whole run when the model emits no text; unchanged ranges now name which clock spans lead or lag, and the timeline no longer says 收窄.

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

frontend/src/components/conversational-birth-time-rectification.tsx

@@ -27,6 +27,7 @@ export type PersistedRectificationTurn = Readonly<{
     methods?: readonly string[];
     skill_name?: string;
     skill_version?: string;
+    answer_origin?: "host_fallback";
   }> | null;
 }>;
 

frontend/src/components/rectification-agentic-chat.tsx

@@ -60,6 +60,8 @@ import {
   rectificationConversationState,
   rectificationInitialLiveLabel,
   rectificationQuestionGapState,
+  rectificationReadonlyRangeCopy,
+  contrastProbesFromReceipt,
   searchWindowFromSnapshot,
   caseStageFromSnapshot,
   type RectificationCaseSnapshotPayload,
@@ -177,12 +179,23 @@ function questionSourceFromSnapshot(value: unknown): "focus" | "unavailable" | n
 
 function RectificationReadonlyRange({
   range,
+  sessionOutcome,
+  discriminatingEventProbes,
+  contrastProbes,
 }: Readonly<{
   range: readonly [string, string];
+  sessionOutcome: string | null;
+  discriminatingEventProbes: unknown;
+  contrastProbes: unknown;
 }>) {
   return (
     <p className="rectification-readonly-range" role="status">
-      目前范围 {range[0]}–{range[1]}，还在收窄
+      {rectificationReadonlyRangeCopy({
+        range,
+        sessionOutcome,
+        discriminatingEventProbes,
+        contrastProbes,
+      })}
     </p>
   );
 }
@@ -986,6 +999,12 @@ export function RectificationAgenticChat(props: RectificationAgenticChatProps) {
           { role: "assistant", text: parsed.text },
         ]);
         onCompleted?.();
+      } else {
+        await loadCaseSnapshot((turns) => {
+          if (turns.length) {
+            setMessages((current) => mergeTurnQuestions(current, turns));
+          }
+        });
       }
     } catch (caught) {
       frames.settle();
@@ -1487,6 +1506,7 @@ export function RectificationAgenticChat(props: RectificationAgenticChatProps) {
     liveQuestionVisible: liveQuestionOnMessages,
     questionMissing: currentQuestion === null,
     questionLoadFailed: questionSource === "unavailable",
+    questionPersisted: Boolean(currentQuestion?.prompt && questionSource === "focus"),
     offerAwaitingReader: showSelectionCards && !candidateResult?.selectedTime,
     nextUserActionId,
     busy,
@@ -1726,11 +1746,21 @@ export function RectificationAgenticChat(props: RectificationAgenticChatProps) {
                 {showReadonlyRange && message.renderKey === latestSettledAssistant?.renderKey && candidateResult?.credibleRange && (
                   <RectificationReadonlyRange
                     range={candidateResult.credibleRange}
+                    sessionOutcome={candidateResult.sessionOutcome}
+                    discriminatingEventProbes={candidateResult.decisionReceipt?.discriminating_event_probes}
+                    contrastProbes={contrastProbesFromReceipt(candidateResult.decisionReceipt)}
                   />
                 )}
               </div>
             );
           })}
+          {questionGap === "persisted_question" && currentQuestion?.prompt && (
+            <div className="rectification-message-wrap rectification-message-entry" data-testid="persisted-question">
+              <div className="rectification-message-question">
+                <p className="rectification-message-question__prompt">{currentQuestion.prompt}</p>
+              </div>
+            </div>
+          )}
           {questionGap === "preparing" && (
             <div className="rectification-message-wrap rectification-message-entry rectification-question-gap">
               <ConsultationTimelineLiveRow id="question-preparing" label={RECTIFICATION_QUESTION_PREPARING_LABEL} />
@@ -1777,7 +1807,7 @@ export function RectificationAgenticChat(props: RectificationAgenticChatProps) {
               ? "该校正已结束，只能查看历史；需要再次校正请新建。"
               : showLiveChoiceCard
                 ? "点上面的选项即可；想补一句细节再写"
-                : collectSpokenPrompt
+                : (liveQuestionOnMessages || questionGap === "persisted_question") && collectSpokenPrompt
                   ? "请回答上面的问题…"
                   : "继续说你记得的人生经历，或回答刚才的问题…"}
             maxLength={RECTIFICATION_COMPOSER_MAX_LENGTH}