fix(onboarding): restore uncertain birth-time intake

frontend/src/components/birth-time-intake.tsx

@@ -6,6 +6,7 @@ import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@
 import { birthTimeConsultationOptionsCopy } from "@/lib/birth-time-consultation-consent";
 import {
   birthTimeDisplayState,
+  birthTimePeriodOptions,
   birthTimeSourceDefaults,
   birthTimeSourceOptions,
   type BirthTimeDraft,
@@ -70,6 +71,9 @@ export function BirthTimeIntakeFields({ value, onPatch }: BirthTimeIntakeProps)
   const source = value.birthTimeSource;
   const isConfirmed = value.birthTimeStatus === "confirmed";
   const displayState = birthTimeDisplayState(value);
+  const knowledgeMode = source === "period_only" || source === "unknown"
+    ? "uncertain"
+    : source ? "exact" : "";
   const usesClockTime = source === "hospital_record"
     || source === "family_exact"
     || source === "approximate"
@@ -114,16 +118,20 @@ export function BirthTimeIntakeFields({ value, onPatch }: BirthTimeIntakeProps)
       )}
 
       {!isConfirmed && <fieldset className="birth-time-source-fieldset">
-        <legend>填写出生时间</legend>
-        <p className="birth-time-source-intro">请填写你初始化提供的具体出生时间。</p>
+        <legend>你对出生时间了解多少？</legend>
+        <p className="birth-time-source-intro">不用猜具体分钟，先选一个最符合你的情况的选项。</p>
         <div className="birth-time-source-list">
           {birthTimeSourceOptions.map((option) => (
             <label
-              className={`birth-time-source-option ${source === option.value ? "is-selected" : ""}`}
+              className={`birth-time-source-option ${option.value === "family_exact"
+                ? knowledgeMode === "exact" ? "is-selected" : ""
+                : knowledgeMode === "uncertain" ? "is-selected" : ""}`}
               key={option.value}
             >
               <input
-                checked={source === option.value}
+                checked={option.value === "family_exact"
+                  ? knowledgeMode === "exact"
+                  : knowledgeMode === "uncertain"}
                 name={`birth-time-source-${groupId}`}
                 type="radio"
                 value={option.value}
@@ -158,6 +166,67 @@ export function BirthTimeIntakeFields({ value, onPatch }: BirthTimeIntakeProps)
           )}
         </div>
       )}
+
+      {source === "period_only" && (
+        <div className="birth-time-detail-grid birth-time-period-details onboarding-card-reveal">
+          <label>
+            <span>请选择最接近的时间范围</span>
+            <Select
+              required
+              value={value.birthTimePeriod || null}
+              onValueChange={(nextValue) => {
+                if (typeof nextValue === "string") onPatch({ birthTimePeriod: nextValue });
+              }}
+            >
+              <SelectTrigger aria-label="最接近的时间范围">
+                <SelectValue placeholder="请选择大致时段">
+                  {(selectedValue) => birthTimePeriodOptions.find((option) => option.value === selectedValue)?.label ?? "请选择大致时段"}
+                </SelectValue>
+              </SelectTrigger>
+              <SelectContent>
+                {birthTimePeriodOptions.map((option) => (
+                  <SelectItem key={option.value} value={option.value}>{option.label}</SelectItem>
+                ))}
+              </SelectContent>
+            </Select>
+          </label>
+          <label>
+            <span>补充描述（可选）</span>
+            <textarea
+              maxLength={240}
+              placeholder="例如：天刚亮、午饭前后、家人记得大约 6—8 点"
+              rows={2}
+              value={value.birthTimeClue}
+              onChange={(event) => onPatch({ birthTimeClue: event.target.value })}
+            />
+          </label>
+          <button
+            className="button-secondary birth-time-skip-button"
+            type="button"
+            onClick={() => onPatch({
+              birthTimeSource: "unknown",
+              reportedTime: "",
+              birthTimePeriod: "",
+              birthTimeClue: "",
+              uncertaintyBeforeMinutes: null,
+              uncertaintyAfterMinutes: null,
+              birthTimeStatus: "reported",
+              time: "",
+            })}
+          >完全不清楚，跳过出生时间</button>
+        </div>
+      )}
+
+      {source === "unknown" && (
+        <div className="birth-time-detail-note onboarding-card-reveal" role="status">
+          <p>已跳过具体出生时间。保存后可以直接使用首页功能，生时校正以后需要时再做。</p>
+          <button
+            className="button-secondary"
+            type="button"
+            onClick={() => onPatch({ birthTimeSource: "period_only", birthTimeStatus: "reported" })}
+          >我可以描述一个时间范围</button>
+        </div>
+      )}
     </div>
   );
 }