fix+feat(ux): 已存草稿显示已保存(Q6) + AI 推理动画指示器(A)

- Q6 bug: useAutosave 加 initialSavedText，进页种入已存草稿时初始即「已保存」，修「加载已存草稿却显示尚未保存」的误导。
- A: 新 ThinkingIndicator（三点波动，motion-safe 尊重 reduced-motion）接入审稿进行中/验收中/回炉中三处静态文案，长等待看得见在工作。

apps/web/components/review/ReviewReport.tsx

@@ -30,6 +30,7 @@ import { useReviewStream } from "@/lib/review/useReviewStream";
 import type { ReviewConflict, StyleDriftSegment } from "@/lib/review/sse";
 import { normalizeStyleDrift } from "@/lib/style/style";
 import { useToast } from "@/components/Toast";
+import { ThinkingIndicator } from "@/components/ThinkingIndicator";
 import { AcceptPanel } from "./AcceptPanel";
 import { AnnotatedText } from "./AnnotatedText";
 import { ConflictCard } from "./ConflictCard";
@@ -429,8 +430,8 @@ function SectionStatusLine({
 }: SectionStatusLineProps) {
   if (reviewing) {
     return (
-      <p className="mt-1 text-xs text-info" aria-live="polite">
-        审稿进行中…
+      <p className="mt-1 text-xs text-info">
+        <ThinkingIndicator label="审稿进行中" />
       </p>
     );
   }