diff --git a/frontend/DESIGN.md b/frontend/DESIGN.md
index 5b6e4dcc..96c20625 100644
--- a/frontend/DESIGN.md
+++ b/frontend/DESIGN.md
@@ -1164,10 +1164,11 @@ D40 / D45 / D60 的表格上方，出生时间不是「已校正」时多一句
 ### 位置一：星盘页顶栏按钮
 
 - 星盘页 `ok` 后立即预取 `/api/birth-sky?subject=<当前人物>` 并在屏外画好 PNG；**画好之后**顶栏右侧才出现一枚描边按钮「那一刻的天空」（`<Button variant="outline" size="sm">`，顶栏里按 `.chat-header-actions button` 收成 32px + 命中区外扩）。预取失败、资料不全、切人物时都不显示按钮，不占位、不报错。切换人物或改出生资料（指纹变）就按新人物重新预取。家人的盘也能生成。
-- 点按钮打开原生 `<dialog>`，**只放图**（第三轮 P1，原来的灰色面板、标题栏、「关闭」文字按钮都删了）：dialog 本身透明、铺满视口，`::backdrop` 是 `night` 页底色 90% 不透明；图 3:4，按视口取最大（宽不超过视口减 32px，高给下方「保存图片」一行留位），圆角 `--radius-md`；图下方居中「保存图片」（night 墨色细描边，透明底）；右上角一个只有图标的 ×（读屏名「关闭」）。点图以外的地方、按 Esc、点 × 都能关，焦点回到按钮。所有按钮 ≥ 44px。窄屏和桌面同一套，不再有桌面居中面板。
-- 「保存图片」：浏览器能分享文件时（iOS Safari）调 `navigator.share({ files })`，系统面板里有「存储图像」；否则 Blob + `a.download`。用户取消分享不算错误、不提示。
-- 弹层、画布与导出代码都在懒加载 chunk 里（`next/dynamic` + 动态 `import()`），首页 `/` 不带它们。按钮本身是星盘页里的一个普通 `<Button>`（只在数据就绪时渲染）。
-- 等待：没有等待态。按钮出现时图已就绪；弹层打开就是图。
+- 点按钮**重放群星汇聚并定格**（2026-09-29，TASK-mobile-chart-and-confirmed-edit-20260929 M4，替换第三轮 P1 的静态海报弹层）：与首次建盘过场同一个组件 `BirthSkyConverge`、同一条时间轴，`mode="hold"`——汇聚约 3 秒、文字 600ms 淡入，然后**停在定格帧不动**，不淡出、不自动关闭。每次打开都从头重放。定格帧就是导出的海报（画布调用序列逐条相同，且用生成 PNG 时同一个宋体判定 `cover.serif`）。全屏原生 `<dialog>` portal 到 `document.body`，底色 `night` 页底色，画布取视口内最大 3:4、乘 DPR。
+- 控件浮在画面上方一行：**左上 ×**（只有图标，读屏名「关闭」）、**右上「分享」**（分享图标 + 字，night 墨色细描边）。播放中也在，都 ≥ 44px，顶部留安全区。点画面（不在控件上）直接跳到定格帧、**不关闭**；按 Esc 或点 × 关闭，焦点回到按钮。`prefers-reduced-motion` 时不汇聚，600ms 淡入到定格帧。
+- 「分享」：浏览器能分享文件时（iOS Safari）调 `navigator.share({ files })`，系统面板里有「存储图像」；否则 Blob + `a.download`。分享的就是屏幕上定格的那张 PNG（按钮出现前已画好，分享从不等待）。用户取消不算错误、不提示；其他失败在右上方小字「没能分享，再试一次。」。
+- 重放层、画布与导出代码都在懒加载 chunk 里（`next/dynamic` + 动态 `import()`，`components/birth-sky/birth-sky-replay.tsx`），首页 `/` 不带它们。按钮本身是星盘页里的一个普通 `<Button>`（只在数据就绪时渲染）。
+- 等待：没有等待态。按钮出现时数据与 PNG 已就绪；打开就开始放。
 
 ### 位置二：报告封面（2026-09-28 追加，TASK-birth-sky-followup-20260928 F1–F3）
 
diff --git a/frontend/docs/VOICE.md b/frontend/docs/VOICE.md
index 0b39f342..6656d079 100644
--- a/frontend/docs/VOICE.md
+++ b/frontend/docs/VOICE.md
@@ -160,7 +160,7 @@ Jyotisha 的可见文案是产品的一部分。正确性红线（真实性、
 
 首页开场语不用星星、月亮一类比喻（上文），那一条只管首页问候。封面写的是出生那一刻真实在天上的天体，不是比喻，两者不冲突。
 
-弹层文案：星盘页按钮字「那一刻的天空」（也是弹层的无障碍名称，弹层里不再显示标题）；弹层里只有图、「保存图片」和一个只有图标的关闭（读屏名「关闭」）。保存失败（极少见，分享与下载都不可用时）写「没能保存。长按或右键上面的图，也能存下来。」图片的替代文字是主句加事实句。
+重放层文案（2026-09-29 M4，替换静态海报弹层）：星盘页按钮字「那一刻的天空」（也是重放层的无障碍名称，层里不显示标题）；层里只有定格的画面、左上一个只有图标的关闭（读屏名「关闭」）和右上「分享」。分享失败（极少见，分享与下载都不可用时）写「没能分享，再试一次。」画面的替代文字是主句加事实句。原「保存图片」与「没能保存。长按或右键上面的图，也能存下来。」已不再使用：画面是画布，不能长按存图。
 
 首次建盘的群星汇聚过场（2026-09-28 追加，TASK-birth-sky-followup-20260928）里**没有按钮、没有额外文字**，字就是封面上的主句与事实句；原来弹层上的「继续」已删除。过场结束后首页轻提示一次：「这片天空在星盘页可以保存。」——一句陈述，句号结尾，不加感叹、不加 emoji，不催用户去做。报告封面也不加任何文字或按钮。
 
diff --git a/frontend/src/components/birth-sky/birth-sky-converge.css b/frontend/src/components/birth-sky/birth-sky-converge.css
index e16389a9..d3ebc721 100644
--- a/frontend/src/components/birth-sky/birth-sky-converge.css
+++ b/frontend/src/components/birth-sky/birth-sky-converge.css
@@ -23,3 +23,47 @@
 .birth-sky-converge canvas { display: block; }
 @supports (height: 1dvh) { .birth-sky-converge { height: 100dvh; } }
 @media print { .birth-sky-converge { display: none !important; } }
+/* Chart page replay controls (TASK-mobile-chart-and-confirmed-edit-20260929 M4):
+   × top left, 「分享」 top right, on the night floor in its ink (DESIGN §17:
+   #1a1a19 / #f2f0ea — the picture is always night). 44px targets; the first-
+   chart reveal passes no controls and stays button-free. */
+.birth-sky-controls {
+  position: absolute;
+  inset: 0 0 auto 0;
+  display: flex;
+  justify-content: space-between;
+  align-items: flex-start;
+  flex-wrap: wrap;
+  padding: max(var(--space-2), env(safe-area-inset-top)) max(var(--space-2), env(safe-area-inset-right)) 0 max(var(--space-2), env(safe-area-inset-left));
+  pointer-events: none;
+}
+.birth-sky-control {
+  pointer-events: auto;
+  min-width: 44px;
+  height: 44px;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  gap: var(--space-1);
+  padding: 0 var(--space-3);
+  border: 0;
+  border-radius: var(--radius-md);
+  background: transparent;
+  color: #f2f0ea;
+  font: inherit;
+  font-size: var(--type-body-sm);
+  cursor: pointer;
+  transition: background-color 120ms ease-out, transform 120ms ease-out;
+}
+.birth-sky-control:hover { background: color-mix(in srgb, #f2f0ea 10%, transparent); }
+.birth-sky-control:active { transform: scale(.96); }
+.birth-sky-control:focus-visible { outline: 2px solid #f2f0ea; outline-offset: 2px; }
+.birth-sky-control svg { width: 20px; height: 20px; }
+.birth-sky-share { border: 1px solid color-mix(in srgb, #f2f0ea 42%, transparent); }
+.birth-sky-control-error {
+  flex-basis: 100%;
+  margin: var(--space-2) 0 0;
+  text-align: right;
+  color: #b3afa4;
+  font-size: var(--type-body-sm);
+}
diff --git a/frontend/src/components/birth-sky/birth-sky-converge.tsx b/frontend/src/components/birth-sky/birth-sky-converge.tsx
index db6b0241..f081a4a2 100644
--- a/frontend/src/components/birth-sky/birth-sky-converge.tsx
+++ b/frontend/src/components/birth-sky/birth-sky-converge.tsx
@@ -1,11 +1,12 @@
 "use client";
 
 import { useEffect, useRef } from "react";
+import type { ReactNode } from "react";
 import { createPortal } from "react-dom";
 
 import "./birth-sky-converge.css";
 
-import { birthSkyRevealAt, birthSkyScatter } from "@/lib/birth-sky/converge";
+import { birthSkyHoldAtMs, birthSkyRevealAt, birthSkyScatter, type BirthSkyRevealMode } from "@/lib/birth-sky/converge";
 import { BIRTH_SKY_PALETTES, drawBirthSky, type BirthSkyCanvas } from "@/lib/birth-sky/draw";
 import type { BirthSkyRevealSky } from "@/lib/birth-sky/reveal";
 import { birthSkyFactLine, birthSkyHeadline } from "@/lib/birth-sky/sentence";
@@ -17,13 +18,23 @@ export function birthSkyConvergeSize(viewportWidth: number, viewportHeight: numb
 }
 
 /**
- * First-chart convergence (TASK-birth-sky-followup-20260928 F4). A full-screen
- * layer with no buttons: the stars converge, the words appear, the layer fades
- * and the step underneath (unchanged) is simply there. A tap, a click or Esc
- * ends it at once. Every frame is `drawBirthSky` with interpolated positions,
- * so the settled frame is the exported cover.
+ * The star convergence. Every frame is `drawBirthSky` with interpolated
+ * positions, so the settled frame is the exported cover.
+ *
+ * - `reveal` (first chart, TASK-birth-sky-followup-20260928 F4): a full-screen
+ *   layer with no buttons; the stars converge, the words appear, the layer
+ *   fades and the step underneath (unchanged) is simply there. A tap, a click
+ *   or Esc ends it at once.
+ * - `hold` (chart page, TASK-mobile-chart-and-confirmed-edit-20260929 M4): the
+ *   same converge and words, then it stays on the settled frame. A tap skips to
+ *   that frame; Esc closes. The caller's `controls` (close, share) sit on top.
  */
-export function BirthSkyConverge({ reveal, onDone }: { reveal: BirthSkyRevealSky; onDone: () => void }) {
+export function BirthSkyConverge({ reveal, onDone, mode = "reveal", controls }: {
+  reveal: BirthSkyRevealSky;
+  onDone: () => void;
+  mode?: BirthSkyRevealMode;
+  controls?: ReactNode;
+}) {
   const dialog = useRef<HTMLDialogElement>(null);
   const canvas = useRef<HTMLCanvasElement>(null);
 
@@ -40,7 +51,18 @@ export function BirthSkyConverge({ reveal, onDone }: { reveal: BirthSkyRevealSky
     let frameHandle = 0;
     let started: number | null = null;
     let finished = false;
+    let last: ReturnType<typeof birthSkyRevealAt> | null = null;
 
+    const draw = (moment: ReturnType<typeof birthSkyRevealAt>) => {
+      last = moment;
+      layer.style.opacity = String(moment.layer);
+      drawBirthSky(context as BirthSkyCanvas, reveal.sky, {
+        palette: "night",
+        width: surface.width,
+        height: surface.height,
+        serif: reveal.serif,
+      }, { ...moment.frame, scatter });
+    };
     const fit = () => {
       const size = birthSkyConvergeSize(window.innerWidth, window.innerHeight);
       const ratio = window.devicePixelRatio || 1;
@@ -48,6 +70,8 @@ export function BirthSkyConverge({ reveal, onDone }: { reveal: BirthSkyRevealSky
       surface.style.height = `${size.height}px`;
       surface.width = Math.round(size.width * ratio);
       surface.height = Math.round(size.height * ratio);
+      // Resizing clears the canvas; a held frame has no next tick to repaint it.
+      if (last?.held) draw(last);
     };
     const finish = () => {
       if (finished) return;
@@ -58,17 +82,20 @@ export function BirthSkyConverge({ reveal, onDone }: { reveal: BirthSkyRevealSky
     const tick = (now: number) => {
       if (finished) return;
       started ??= now;
-      const moment = birthSkyRevealAt(now - started, reduced);
-      layer.style.opacity = String(moment.layer);
-      drawBirthSky(context as BirthSkyCanvas, reveal.sky, {
-        palette: "night",
-        width: surface.width,
-        height: surface.height,
-        serif: reveal.serif,
-      }, { ...moment.frame, scatter });
+      const moment = birthSkyRevealAt(now - started, reduced, mode);
+      draw(moment);
       if (moment.done) finish();
-      else frameHandle = requestAnimationFrame(tick);
+      else if (!moment.held) frameHandle = requestAnimationFrame(tick);
     };
+    // `hold`: a tap on the stage (not on a control) jumps to the settled frame.
+    const skip = (event: Event) => {
+      if (finished || last?.held) return;
+      if (event.target instanceof Element && event.target.closest(".birth-sky-controls")) return;
+      cancelAnimationFrame(frameHandle);
+      started = performance.now() - birthSkyHoldAtMs(reduced);
+      frameHandle = requestAnimationFrame(tick);
+    };
+    const onPointerDown = mode === "hold" ? skip : finish;
     const cancel = (event: Event) => {
       event.preventDefault();
       finish();
@@ -78,18 +105,18 @@ export function BirthSkyConverge({ reveal, onDone }: { reveal: BirthSkyRevealSky
     layer.style.opacity = "0";
     layer.showModal();
     layer.addEventListener("cancel", cancel);
-    layer.addEventListener("pointerdown", finish);
+    layer.addEventListener("pointerdown", onPointerDown);
     window.addEventListener("resize", fit);
     frameHandle = requestAnimationFrame(tick);
     return () => {
       finished = true;
       cancelAnimationFrame(frameHandle);
       layer.removeEventListener("cancel", cancel);
-      layer.removeEventListener("pointerdown", finish);
+      layer.removeEventListener("pointerdown", onPointerDown);
       window.removeEventListener("resize", fit);
       layer.close();
     };
-  }, [reveal, onDone]);
+  }, [reveal, onDone, mode]);
 
   // Portalled to <body>, outside SidebarInset, which is inert while any
   // account dialog or the redeem paywall is open (BUG-968, BUG-1080).
@@ -105,6 +132,7 @@ export function BirthSkyConverge({ reveal, onDone }: { reveal: BirthSkyRevealSky
         role="img"
         aria-label={`${birthSkyHeadline(reveal.sky)}${birthSkyFactLine(reveal.sky)}。`}
       />
+      {controls}
     </dialog>,
     document.body,
   );
diff --git a/frontend/src/components/birth-sky/birth-sky-dialog.tsx b/frontend/src/components/birth-sky/birth-sky-dialog.tsx
deleted file mode 100644
index b7921697..00000000
--- a/frontend/src/components/birth-sky/birth-sky-dialog.tsx
+++ /dev/null
@@ -1,77 +0,0 @@
-"use client";
-
-import { X } from "lucide-react";
-import { useEffect, useRef, useState } from "react";
-
-import "./birth-sky.css";
-
-import type { BirthSkyCover } from "@/lib/birth-sky/cover";
-import { saveBirthSkyImage } from "@/lib/birth-sky/export";
-import { birthSkyFactLine, birthSkyHeadline } from "@/lib/birth-sky/sentence";
-
-export type BirthSkyDialogProps = Readonly<{
-  cover: BirthSkyCover;
-  onClose: () => void;
-}>;
-
-/** Accessible name of the stage; the picture itself carries the words. */
-const BIRTH_SKY_DIALOG_LABEL = "那一刻的天空";
-
-/**
- * Native `<dialog>` that shows only the picture on a dimmed stage, sized to
- * the viewport, with 「保存图片」 under it. The picture is an `<img>` of the
- * painted PNG, so a long press saves it on iOS; 「保存图片」 shares or
- * downloads the same file.
- */
-export function BirthSkyDialog({ cover, onClose }: BirthSkyDialogProps) {
-  const dialog = useRef<HTMLDialogElement>(null);
-  const saving = useRef(false);
-  const [error, setError] = useState<string | null>(null);
-
-  useEffect(() => {
-    const element = dialog.current;
-    const previous = document.activeElement;
-    element?.showModal();
-    return () => {
-      element?.close();
-      if (previous instanceof HTMLElement && previous.isConnected) previous.focus({ preventScroll: true });
-    };
-  }, []);
-
-  async function save() {
-    if (saving.current) return;
-    saving.current = true;
-    setError(null);
-    try {
-      await saveBirthSkyImage(cover.blob);
-    } catch {
-      setError("没能保存。长按或右键上面的图，也能存下来。");
-    } finally {
-      saving.current = false;
-    }
-  }
-
-  const description = `${birthSkyHeadline(cover.sky)}${birthSkyFactLine(cover.sky)}。`;
-  // Poster only (TASK-birth-sky-polish-20260928 P1): no panel, no title bar.
-  // The dialog is the dimmed stage; a click on it (not on the picture or a
-  // button) closes, as do Esc and the icon ×.
-  return (
-    <dialog
-      ref={dialog}
-      className="birth-sky-dialog"
-      aria-label={BIRTH_SKY_DIALOG_LABEL}
-      onCancel={(event) => { event.preventDefault(); onClose(); }}
-      onClick={(event) => { if (event.target === event.currentTarget) onClose(); }}
-    >
-      <button className="birth-sky-close" type="button" onClick={onClose} aria-label="关闭">
-        <X aria-hidden="true" />
-      </button>
-      {/* eslint-disable-next-line @next/next/no-img-element -- a blob: URL of the painted PNG; long press must save the file itself */}
-      <img className="birth-sky-image" src={cover.url} alt={description} width={1080} height={1440} />
-      <div className="birth-sky-actions">
-        {error ? <p role="alert">{error}</p> : null}
-        <button className="birth-sky-save" type="button" onClick={() => void save()}>保存图片</button>
-      </div>
-    </dialog>
-  );
-}
diff --git a/frontend/src/components/birth-sky/birth-sky-entry.tsx b/frontend/src/components/birth-sky/birth-sky-entry.tsx
index 4389739d..e6185bed 100644
--- a/frontend/src/components/birth-sky/birth-sky-entry.tsx
+++ b/frontend/src/components/birth-sky/birth-sky-entry.tsx
@@ -6,8 +6,8 @@ import { useState } from "react";
 import { Button } from "@/components/ui/button";
 import type { BirthSkyCover } from "@/lib/birth-sky/cover";
 
-const BirthSkyDialog = dynamic(
-  () => import("./birth-sky-dialog").then((module) => module.BirthSkyDialog),
+const BirthSkyReplay = dynamic(
+  () => import("./birth-sky-replay").then((module) => module.BirthSkyReplay),
   { ssr: false },
 );
 
@@ -15,7 +15,8 @@ export const BIRTH_SKY_ENTRY_LABEL = "那一刻的天空";
 
 /**
  * The chart header's one extra action. Rendered only when the cover is already
- * painted; the dialog (and its CSS) is a lazy chunk opened on click.
+ * painted; the replay (convergence, controls and CSS) is a lazy chunk opened on
+ * click, and every open plays it again (TASK-mobile-chart-and-confirmed-edit-20260929 M4).
  */
 export function BirthSkyEntry({ cover }: { cover: BirthSkyCover }) {
   const [open, setOpen] = useState(false);
@@ -24,7 +25,7 @@ export function BirthSkyEntry({ cover }: { cover: BirthSkyCover }) {
       <Button type="button" variant="outline" size="sm" onClick={() => setOpen(true)}>
         {BIRTH_SKY_ENTRY_LABEL}
       </Button>
-      {open ? <BirthSkyDialog cover={cover} onClose={() => setOpen(false)} /> : null}
+      {open ? <BirthSkyReplay cover={cover} onClose={() => setOpen(false)} /> : null}
     </>
   );
 }
diff --git a/frontend/src/components/birth-sky/birth-sky-replay.tsx b/frontend/src/components/birth-sky/birth-sky-replay.tsx
new file mode 100644
index 00000000..ea2258e9
--- /dev/null
+++ b/frontend/src/components/birth-sky/birth-sky-replay.tsx
@@ -0,0 +1,60 @@
+"use client";
+
+import { Share, X } from "lucide-react";
+import { useMemo, useRef, useState } from "react";
+
+import { BirthSkyConverge } from "./birth-sky-converge";
+
+import type { BirthSkyCover } from "@/lib/birth-sky/cover";
+import { saveBirthSkyImage } from "@/lib/birth-sky/export";
+
+/** VOICE.md: the one control that hands the poster out; share sheet on a phone, download elsewhere. */
+export const BIRTH_SKY_SHARE_LABEL = "分享";
+export const BIRTH_SKY_SHARE_FAILED = "没能分享，再试一次。";
+
+/**
+ * The chart page's 「那一刻的天空」 (TASK-mobile-chart-and-confirmed-edit-20260929
+ * M4). Every open replays the star convergence and stays on the settled frame,
+ * which is the poster itself. × (top left) or Esc closes; 「分享」 (top right)
+ * hands out the painted PNG through the share sheet, or downloads it where
+ * there is none. The PNG was painted before the entry button appeared, so
+ * sharing never waits.
+ */
+export function BirthSkyReplay({ cover, onClose }: { cover: BirthSkyCover; onClose: () => void }) {
+  const reveal = useMemo(() => ({ sky: cover.sky, serif: cover.serif }), [cover.sky, cover.serif]);
+  const sharing = useRef(false);
+  const [error, setError] = useState<string | null>(null);
+
+  async function share() {
+    if (sharing.current) return;
+    sharing.current = true;
+    setError(null);
+    try {
+      await saveBirthSkyImage(cover.blob);
+    } catch {
+      setError(BIRTH_SKY_SHARE_FAILED);
+    } finally {
+      sharing.current = false;
+    }
+  }
+
+  return (
+    <BirthSkyConverge
+      reveal={reveal}
+      mode="hold"
+      onDone={onClose}
+      controls={(
+        <div className="birth-sky-controls">
+          <button className="birth-sky-control" type="button" onClick={onClose} aria-label="关闭">
+            <X aria-hidden="true" />
+          </button>
+          <button className="birth-sky-control birth-sky-share" type="button" onClick={() => void share()}>
+            <Share aria-hidden="true" />
+            <span>{BIRTH_SKY_SHARE_LABEL}</span>
+          </button>
+          {error ? <p className="birth-sky-control-error" role="alert">{error}</p> : null}
+        </div>
+      )}
+    />
+  );
+}
diff --git a/frontend/src/components/birth-sky/birth-sky.css b/frontend/src/components/birth-sky/birth-sky.css
deleted file mode 100644
index 71b9f676..00000000
--- a/frontend/src/components/birth-sky/birth-sky.css
+++ /dev/null
@@ -1,89 +0,0 @@
-/* 「那一刻的天空」 dialog (TASK-birth-sky-cover-20260928; poster only since
-   TASK-birth-sky-polish-20260928 P1). Loaded with the lazy dialog chunk only,
-   never on first paint. No panel and no title bar: the dialog is a dimmed
-   stage showing the painted picture, 「保存图片」 under it and an icon × in the
-   corner. The stage and controls use the night palette (DESIGN §17: the dark
-   theme floor #1a1a19 and ink #f2f0ea), because the picture is always night. */
-.birth-sky-dialog {
-  position: fixed;
-  inset: 0;
-  width: 100%;
-  max-width: none;
-  height: 100%;
-  max-height: none;
-  margin: 0;
-  padding: var(--space-4);
-  padding-top: max(var(--space-4), env(safe-area-inset-top));
-  padding-bottom: max(var(--space-4), env(safe-area-inset-bottom));
-  border: 0;
-  background: transparent;
-  color: #f2f0ea;
-  overflow: hidden;
-  box-sizing: border-box;
-}
-.birth-sky-dialog[open] {
-  display: flex;
-  flex-direction: column;
-  align-items: center;
-  justify-content: center;
-  gap: var(--space-4);
-}
-.birth-sky-dialog::backdrop { background: color-mix(in srgb, #1a1a19 90%, transparent); }
-.birth-sky-image {
-  display: block;
-  flex: 0 1 auto;
-  min-height: 0;
-  width: auto;
-  height: auto;
-  /* Room for the save row (44px) + gap + stage padding. */
-  max-width: 100%;
-  max-height: calc(100vh - 44px - 3 * var(--space-4) - env(safe-area-inset-top) - env(safe-area-inset-bottom));
-  aspect-ratio: 3 / 4;
-  border-radius: var(--radius-md);
-  -webkit-touch-callout: default;
-}
-@supports (height: 1dvh) {
-  .birth-sky-dialog { height: 100dvh; }
-  .birth-sky-image { max-height: calc(100dvh - 44px - 3 * var(--space-4) - env(safe-area-inset-top) - env(safe-area-inset-bottom)); }
-}
-.birth-sky-actions {
-  display: flex;
-  flex-direction: column;
-  align-items: center;
-  gap: var(--space-2);
-  flex-shrink: 0;
-}
-.birth-sky-actions p { margin: 0; text-align: center; color: #b3afa4; font-size: var(--type-body-sm); }
-.birth-sky-save {
-  min-height: 44px;
-  padding: 0 var(--space-4);
-  border: 1px solid color-mix(in srgb, #f2f0ea 42%, transparent);
-  border-radius: var(--radius-md);
-  background: transparent;
-  color: #f2f0ea;
-  font: inherit;
-  font-size: var(--type-body-sm);
-  cursor: pointer;
-  transition: background-color 120ms ease-out, transform 120ms ease-out;
-}
-.birth-sky-save:hover { background: color-mix(in srgb, #f2f0ea 10%, transparent); }
-.birth-sky-save:active { transform: scale(.96); }
-.birth-sky-close {
-  position: absolute;
-  top: max(var(--space-2), env(safe-area-inset-top));
-  right: var(--space-2);
-  width: 44px;
-  height: 44px;
-  display: grid;
-  place-items: center;
-  border: 0;
-  border-radius: var(--radius-md);
-  background: transparent;
-  color: #f2f0ea;
-  cursor: pointer;
-  transition: background-color 120ms ease-out;
-}
-.birth-sky-close:hover { background: color-mix(in srgb, #f2f0ea 10%, transparent); }
-.birth-sky-close svg { width: 20px; height: 20px; }
-.birth-sky-save:focus-visible, .birth-sky-close:focus-visible { outline: 2px solid #f2f0ea; outline-offset: 2px; }
-@media print { .birth-sky-dialog { display: none !important; } }
diff --git a/frontend/src/lib/birth-sky/converge.ts b/frontend/src/lib/birth-sky/converge.ts
index f282be0a..39e349f0 100644
--- a/frontend/src/lib/birth-sky/converge.ts
+++ b/frontend/src/lib/birth-sky/converge.ts
@@ -111,10 +111,25 @@ export type BirthSkyRevealTimeline = Readonly<{
   frame: Omit<BirthSkyFrame, "scatter">;
   /** Opacity of the whole overlay. */
   layer: number;
-  /** True once the last fade has finished: remove the overlay, show the next step. */
+  /** True once the last fade has finished: remove the overlay, show the next step. Never in `hold`. */
   done: boolean;
+  /** `hold` only: the settled frame is on screen and stays; no more frames are needed. */
+  held: boolean;
 }>;
 
+/**
+ * `reveal`: the first-chart overlay — converge, words, fade out, done.
+ * `hold` (TASK-mobile-chart-and-confirmed-edit-20260929 M4): the chart page's
+ * 「那一刻的天空」 — the same converge and words, then it stops on the settled
+ * frame (the exported poster) and never fades.
+ */
+export type BirthSkyRevealMode = "reveal" | "hold";
+
+/** `hold`: elapsed time at which the settled frame is fully on screen (words faded in). */
+export function birthSkyHoldAtMs(reducedMotion: boolean): number {
+  return reducedMotion ? REDUCED_FADE_IN_MS : BIRTH_SKY_CONVERGE_MS + TEXT_FADE_IN_MS;
+}
+
 const SETTLED = { converge: 1, chrome: 1, text: 1 } as const;
 
 /**
@@ -123,13 +138,22 @@ const SETTLED = { converge: 1, chrome: 1, text: 1 } as const;
  * 3–5.5 s words fade in and hold; 5.5–6.5 s the layer fades out.
  * Reduced motion: the finished picture fades in, holds, fades out.
  */
-export function birthSkyRevealAt(elapsedMs: number, reducedMotion: boolean): BirthSkyRevealTimeline {
+export function birthSkyRevealAt(
+  elapsedMs: number,
+  reducedMotion: boolean,
+  mode: BirthSkyRevealMode = "reveal",
+): BirthSkyRevealTimeline {
   const t = Math.max(0, elapsedMs);
+  if (mode === "hold") {
+    const held = t >= birthSkyHoldAtMs(reducedMotion);
+    if (reducedMotion) return { frame: SETTLED, layer: clamp01(t / REDUCED_FADE_IN_MS), done: false, held };
+    if (held) return { frame: SETTLED, layer: 1, done: false, held };
+  }
   const fadeStart = BIRTH_SKY_CONVERGE_MS + BIRTH_SKY_TEXT_MS;
   const done = t >= BIRTH_SKY_REVEAL_TOTAL_MS;
-  const fadeOut = t >= fadeStart ? 1 - clamp01((t - fadeStart) / BIRTH_SKY_FADE_MS) : 1;
+  const fadeOut = mode === "hold" ? 1 : t >= fadeStart ? 1 - clamp01((t - fadeStart) / BIRTH_SKY_FADE_MS) : 1;
   if (reducedMotion) {
-    return { frame: SETTLED, layer: Math.min(clamp01(t / REDUCED_FADE_IN_MS), fadeOut), done };
+    return { frame: SETTLED, layer: Math.min(clamp01(t / REDUCED_FADE_IN_MS), fadeOut), done, held: false };
   }
   if (t < BIRTH_SKY_CONVERGE_MS) {
     const progress = t / BIRTH_SKY_CONVERGE_MS;
@@ -137,11 +161,13 @@ export function birthSkyRevealAt(elapsedMs: number, reducedMotion: boolean): Bir
       frame: { converge: easeOutCubic(progress), chrome: progress, text: 0 },
       layer: clamp01(t / LAYER_FADE_IN_MS),
       done: false,
+      held: false,
     };
   }
   return {
     frame: { converge: 1, chrome: 1, text: clamp01((t - BIRTH_SKY_CONVERGE_MS) / TEXT_FADE_IN_MS) },
     layer: fadeOut,
-    done,
+    done: mode === "hold" ? false : done,
+    held: false,
   };
 }
diff --git a/frontend/src/lib/birth-sky/cover.ts b/frontend/src/lib/birth-sky/cover.ts
index 56fdfa29..765965da 100644
--- a/frontend/src/lib/birth-sky/cover.ts
+++ b/frontend/src/lib/birth-sky/cover.ts
@@ -9,6 +9,8 @@ export type BirthSkyCover = Readonly<{
   sky: BirthSkyOk;
   blob: Blob;
   url: string;
+  /** Whether the PNG was painted with the heading serif; the live replay draws the same. */
+  serif: boolean;
 }>;
 
 export async function fetchBirthSky(subjectId: string, signal?: AbortSignal): Promise<BirthSkyOk | null> {
@@ -29,10 +31,10 @@ export async function loadBirthSkyCover(key: string, subjectId: string, signal?:
   try {
     const sky = await fetchBirthSky(subjectId, signal);
     if (!sky || signal?.aborted) return null;
-    const { renderBirthSkyPng } = await import("./render.ts");
-    const blob = await renderBirthSkyPng(sky, "night");
+    const { paintBirthSkyPng } = await import("./render.ts");
+    const { blob, serif } = await paintBirthSkyPng(sky, "night");
     if (signal?.aborted) return null;
-    return { key, sky, blob, url: URL.createObjectURL(blob) };
+    return { key, sky, blob, url: URL.createObjectURL(blob), serif };
   } catch {
     return null;
   }
diff --git a/frontend/src/lib/birth-sky/render.ts b/frontend/src/lib/birth-sky/render.ts
index 46c8285b..eb14f906 100644
--- a/frontend/src/lib/birth-sky/render.ts
+++ b/frontend/src/lib/birth-sky/render.ts
@@ -39,11 +39,15 @@ export async function waitForHeadingSerif(
   }
 }
 
-/** Paint the cover on an off-screen canvas and return the PNG. Browser only. */
-export async function renderBirthSkyPng(
+/**
+ * Paint the cover on an off-screen canvas. Returns the PNG and whether the
+ * heading serif made it in time, so a live canvas can draw the identical
+ * picture (TASK-mobile-chart-and-confirmed-edit-20260929 M4). Browser only.
+ */
+export async function paintBirthSkyPng(
   sky: BirthSkyOk,
   palette: BirthSkyPaletteName = "night",
-): Promise<Blob> {
+): Promise<Readonly<{ blob: Blob; serif: boolean }>> {
   const serif = await waitForHeadingSerif(`${birthSkyHeadline(sky)}${BIRTH_SKY_TOP_LABEL}`);
   const canvas = document.createElement("canvas");
   canvas.width = BIRTH_SKY_EXPORT_WIDTH;
@@ -56,5 +60,13 @@ export async function renderBirthSkyPng(
     height: BIRTH_SKY_EXPORT_HEIGHT,
     serif,
   });
-  return canvasToPngBlob(canvas);
+  return { blob: await canvasToPngBlob(canvas), serif };
+}
+
+/** Paint the cover on an off-screen canvas and return the PNG. Browser only. */
+export async function renderBirthSkyPng(
+  sky: BirthSkyOk,
+  palette: BirthSkyPaletteName = "night",
+): Promise<Blob> {
+  return (await paintBirthSkyPng(sky, palette)).blob;
 }
diff --git a/frontend/tests/birth-sky-polish-20260928.test.ts b/frontend/tests/birth-sky-polish-20260928.test.ts
index be4af409..ddaaa83a 100644
--- a/frontend/tests/birth-sky-polish-20260928.test.ts
+++ b/frontend/tests/birth-sky-polish-20260928.test.ts
@@ -7,29 +7,25 @@ import { tryOpenRedeemPaywall } from "../src/lib/redeem-paywall-once.ts";
 // TASK-birth-sky-polish-20260928 P1 (poster-only dialog) and P4 (paywall timing, BUG-1080).
 
 const read = (path: string) => readFileSync(new URL(`../${path}`, import.meta.url), "utf8");
-const dialog = read("src/components/birth-sky/birth-sky-dialog.tsx");
-const dialogCss = read("src/components/birth-sky/birth-sky.css");
 const converge = read("src/components/birth-sky/birth-sky-converge.tsx");
 const hook = read("src/hooks/use-consultation-run.ts");
 const page = read("src/app/(app)/page.tsx");
 
-test("chart page dialog shows only the picture: no title bar, no panel; icon × and 「保存图片」", () => {
-  assert.doesNotMatch(dialog, /<h2|<header|birth-sky-panel|birth-sky-header|birth-sky-frame|birth-sky-footer|>关闭</);
-  assert.doesNotMatch(dialogCss, /birth-sky-panel|birth-sky-header|birth-sky-frame|birth-sky-footer/);
-  assert.match(dialog, /<button className="birth-sky-close" type="button" onClick=\{onClose\} aria-label="关闭">\s*<X aria-hidden="true" \/>/);
-  assert.match(dialog, /<img className="birth-sky-image" src=\{cover\.url\}/);
-  assert.match(dialog, /<button className="birth-sky-save" type="button" onClick=\{\(\) => void save\(\)\}>保存图片<\/button>/);
-  assert.match(dialog, /aria-label=\{BIRTH_SKY_DIALOG_LABEL\}/);
-  // Backdrop click (the stage itself, not the picture or a button) and Esc both close.
-  assert.match(dialog, /onClick=\{\(event\) => \{ if \(event\.target === event\.currentTarget\) onClose\(\); \}\}/);
-  assert.match(dialog, /onCancel=\{\(event\) => \{ event\.preventDefault\(\); onClose\(\); \}\}/);
-  // The stage is transparent and the backdrop is the night floor; the picture is sized to the viewport.
-  assert.match(dialogCss, /\.birth-sky-dialog \{[^}]*background: transparent;/);
-  assert.match(dialogCss, /\.birth-sky-dialog::backdrop \{ background: color-mix\(in srgb, #1a1a19 90%, transparent\); \}/);
-  assert.match(dialogCss, /\.birth-sky-image \{[^}]*max-width: 100%;[^}]*max-height: calc\(100vh - 44px/);
-  assert.match(dialogCss, /\.birth-sky-save \{[^}]*min-height: 44px;/);
-  assert.match(dialogCss, /\.birth-sky-close \{[^}]*width: 44px;[^}]*height: 44px;/);
-  assert.doesNotMatch(dialogCss, /@media \(min-width: 860px\)/, "no desktop panel variant");
+// 原值（测试名与断言）：chart page dialog shows only the picture…——静态海报弹层：`<img>` + 图下「保存图片」+ 右上 ×，
+//   backdrop 点击关闭，`birth-sky.css` 的舞台与按钮尺寸
+// 新值：chart page replay stays on the poster…——弹层删除，改为重放汇聚后定格（定格帧即海报）；左上 ×、右上「分享」，
+//   同样 44px、夜色底；断言移到 `birth-sky-replay.tsx` / `birth-sky-converge.css`
+// 原因：TASK-mobile-chart-and-confirmed-edit-20260929 M4，产品 2026-09-29「点击那一刻的天空重新跑星星动画，定格到最后一帧，右上角分享」
+test("chart page replay stays on the poster: × top left, 「分享」 top right, no title bar or panel", () => {
+  const replay = read("src/components/birth-sky/birth-sky-replay.tsx");
+  const convergeCss = read("src/components/birth-sky/birth-sky-converge.css");
+  assert.doesNotMatch(replay, /<h2|<header|birth-sky-panel|<img|保存图片/);
+  assert.match(replay, /mode="hold"/);
+  assert.match(replay, /<button className="birth-sky-control" type="button" onClick=\{onClose\} aria-label="关闭">\s*<X aria-hidden="true" \/>/);
+  assert.match(replay, /<button className="birth-sky-control birth-sky-share" type="button" onClick=\{\(\) => void share\(\)\}>/);
+  assert.match(replay, /await saveBirthSkyImage\(cover\.blob\)/);
+  assert.match(convergeCss, /\.birth-sky-controls \{[^}]*justify-content: space-between;/);
+  assert.match(convergeCss, /\.birth-sky-control \{[^}]*min-width: 44px;[^}]*height: 44px;/);
 });
 
 test("paywall gate: the first refusal opens the paywall, every later one falls through to billing", () => {
diff --git a/frontend/tests/birth-sky-replay-20260929.test.ts b/frontend/tests/birth-sky-replay-20260929.test.ts
new file mode 100644
index 00000000..3b14ff66
--- /dev/null
+++ b/frontend/tests/birth-sky-replay-20260929.test.ts
@@ -0,0 +1,123 @@
+import assert from "node:assert/strict";
+import { readFileSync } from "node:fs";
+import test from "node:test";
+
+import {
+  BIRTH_SKY_CONVERGE_MS,
+  BIRTH_SKY_REVEAL_TOTAL_MS,
+  birthSkyHoldAtMs,
+  birthSkyRevealAt,
+  birthSkyScatter,
+} from "../src/lib/birth-sky/converge.ts";
+import {
+  BIRTH_SKY_EXPORT_HEIGHT,
+  BIRTH_SKY_EXPORT_WIDTH,
+  drawBirthSky,
+  type BirthSkyCanvas,
+} from "../src/lib/birth-sky/draw.ts";
+import { goldenSky } from "./birth-sky-test-support.ts";
+
+/*
+ * TASK-mobile-chart-and-confirmed-edit-20260929 M4 (product 2026-09-29): the
+ * chart page's 「那一刻的天空」 replays the convergence on every open, stays on
+ * the settled frame — which is the poster — and shares from the top right.
+ * The first-chart reveal keeps fading out (its own tests are unchanged).
+ */
+
+const read = (path: string) => readFileSync(new URL(`../${path}`, import.meta.url), "utf8");
+const converge = read("src/components/birth-sky/birth-sky-converge.tsx");
+const replay = read("src/components/birth-sky/birth-sky-replay.tsx");
+const entry = read("src/components/birth-sky/birth-sky-entry.tsx");
+const cover = read("src/lib/birth-sky/cover.ts");
+const voice = read("docs/VOICE.md");
+const design = read("DESIGN.md");
+
+type Call = { method: string; args: unknown[] };
+function recorder() {
+  const calls: Call[] = [];
+  const state: Record<string, unknown> = {};
+  const ctx = new Proxy({} as Record<string, unknown>, {
+    get(_target, key: string) {
+      if (key in state) return state[key];
+      if (key === "measureText") return (text: string) => ({ width: text.length * 10 });
+      return (...args: unknown[]) => { calls.push({ method: key, args: [...args, { ...state }] }); };
+    },
+    set(_target, key: string, value: unknown) {
+      state[key] = value;
+      return true;
+    },
+  }) as unknown as BirthSkyCanvas;
+  return { ctx, calls };
+}
+
+test("hold: converges like the reveal, then stops on the settled frame and never fades or ends", () => {
+  const at = (ms: number) => birthSkyRevealAt(ms, false, "hold");
+  assert.deepEqual(at(0).frame, birthSkyRevealAt(0, false).frame, "same start as the reveal");
+  assert.deepEqual(at(1_500).frame, birthSkyRevealAt(1_500, false).frame, "same travel as the reveal");
+  assert.equal(at(BIRTH_SKY_CONVERGE_MS).held, false, "the words are still coming in");
+  const holdAt = birthSkyHoldAtMs(false);
+  assert.equal(holdAt, BIRTH_SKY_CONVERGE_MS + 600);
+  for (const ms of [holdAt, BIRTH_SKY_REVEAL_TOTAL_MS, BIRTH_SKY_REVEAL_TOTAL_MS * 10]) {
+    const moment = at(ms);
+    assert.deepEqual(moment.frame, { converge: 1, chrome: 1, text: 1 }, `settled at ${ms}`);
+    assert.equal(moment.layer, 1, `no fade at ${ms}`);
+    assert.equal(moment.done, false, `never closes itself at ${ms}`);
+    assert.equal(moment.held, true);
+  }
+  // The reveal is unchanged: it still fades out and finishes.
+  assert.equal(birthSkyRevealAt(BIRTH_SKY_REVEAL_TOTAL_MS, false).done, true);
+  assert.equal(birthSkyRevealAt(BIRTH_SKY_REVEAL_TOTAL_MS, false).held, false);
+});
+
+test("hold with reduced motion: no travel, one fade in, then held", () => {
+  const holdAt = birthSkyHoldAtMs(true);
+  assert.equal(holdAt, 600);
+  for (const ms of [0, 300, holdAt, 60_000]) {
+    assert.deepEqual(birthSkyRevealAt(ms, true, "hold").frame, { converge: 1, chrome: 1, text: 1 });
+    assert.equal(birthSkyRevealAt(ms, true, "hold").done, false);
+  }
+  assert.equal(birthSkyRevealAt(0, true, "hold").layer, 0);
+  assert.equal(birthSkyRevealAt(holdAt, true, "hold").layer, 1);
+  assert.equal(birthSkyRevealAt(holdAt, true, "hold").held, true);
+  assert.equal(birthSkyRevealAt(60_000, true, "hold").layer, 1);
+});
+
+test("the held frame is the exported poster, call for call", () => {
+  for (const phase of ["day", "night", "twilight_evening"] as const) {
+    const sky = goldenSky(phase);
+    const options = { palette: "night" as const, width: BIRTH_SKY_EXPORT_WIDTH, height: BIRTH_SKY_EXPORT_HEIGHT };
+    const poster = recorder();
+    drawBirthSky(poster.ctx, sky, options);
+    const held = recorder();
+    drawBirthSky(held.ctx, sky, options, { ...birthSkyRevealAt(birthSkyHoldAtMs(false), false, "hold").frame, scatter: birthSkyScatter(sky) });
+    assert.deepEqual(held.calls, poster.calls, phase);
+  }
+  // The live replay draws with the serif decision the PNG was painted with.
+  assert.match(cover, /const \{ blob, serif \} = await paintBirthSkyPng\(sky, "night"\);/);
+  assert.match(replay, /useMemo\(\(\) => \(\{ sky: cover\.sky, serif: cover\.serif \}\)/);
+});
+
+test("replay overlay: a tap skips to the held frame without closing; Esc and × close; held frames stop the clock", () => {
+  assert.match(converge, /const onPointerDown = mode === "hold" \? skip : finish;/);
+  const skip = converge.slice(converge.indexOf("const skip = "), converge.indexOf("const onPointerDown"));
+  assert.doesNotMatch(skip, /onDone|finish\(\)/, "a tap never closes the replay");
+  assert.match(skip, /closest\("\.birth-sky-controls"\)/, "taps on the controls are theirs");
+  assert.match(skip, /started = performance\.now\(\) - birthSkyHoldAtMs\(reduced\)/);
+  assert.match(converge, /else if \(!moment\.held\) frameHandle = requestAnimationFrame\(tick\);/);
+  assert.match(converge, /if \(last\?\.held\) draw\(last\);/, "a resize repaints the held frame");
+  assert.match(converge, /layer\.addEventListener\("cancel", cancel\)/);
+  assert.match(replay, /onDone=\{onClose\}/);
+  assert.match(replay, /aria-label="关闭"/);
+  assert.match(replay, /\{controls\}|controls=\{/);
+  assert.match(converge, /\{controls\}/);
+});
+
+test("「分享」 hands out the painted PNG; every open is a fresh replay from a lazy chunk", () => {
+  assert.match(replay, /export const BIRTH_SKY_SHARE_LABEL = "分享";/);
+  assert.match(replay, /export const BIRTH_SKY_SHARE_FAILED = "没能分享，再试一次。";/);
+  assert.match(replay, /await saveBirthSkyImage\(cover\.blob\)/);
+  assert.match(entry, /dynamic\(\s*\(\) => import\("\.\/birth-sky-replay"\)/);
+  assert.match(entry, /\{open \? <BirthSkyReplay cover=\{cover\} onClose=\{\(\) => setOpen\(false\)\} \/> : null\}/);
+  assert.match(voice, /没能分享，再试一次。/);
+  assert.match(design, /定格/);
+});
diff --git a/frontend/tests/chart-page-view.test.tsx b/frontend/tests/chart-page-view.test.tsx
index 8e79f762..a2b9e62b 100644
--- a/frontend/tests/chart-page-view.test.tsx
+++ b/frontend/tests/chart-page-view.test.tsx
@@ -459,6 +459,7 @@ test("the birth-sky button appears only once the chart is ok and the cover is pa
     sky: goldenSky("day"),
     blob: new Blob([], { type: "image/png" }),
     url: "blob:birth-sky",
+    serif: false,
   };
   const ready = withSidebarProvider(React.createElement(ChartPageView, { view, birthSky: cover }));
   assert.match(ready, /chat-header-actions/);
@@ -489,7 +490,10 @@ test("birth-sky prefetch follows the current subject and the dialog is a lazy ch
   assert.match(chartView, /useBirthSkyCover\(ok \? ok\.subjectId \?\? "self" : null, ok\?\.profileFingerprint \?\? null\)/);
   assert.match(hook, /\$\{subjectId\}:\$\{fingerprint \?\? ""\}/);
   assert.match(hook, /controller\.abort\(\)/);
-  assert.match(entry, /dynamic\(\s*\(\) => import\("\.\/birth-sky-dialog"\)/);
+  // 原值：入口懒加载 `./birth-sky-dialog`（静态海报弹层）
+  // 新值：入口懒加载 `./birth-sky-replay`（重放汇聚 → 定格 → 右上角分享）
+  // 原因：TASK-mobile-chart-and-confirmed-edit-20260929 M4，产品要求点开重放动画、定格即海报
+  assert.match(entry, /dynamic\(\s*\(\) => import\("\.\/birth-sky-replay"\)/);
   assert.match(cover, /await import\("\.\/render\.ts"\)/);
   assert.doesNotMatch(chartView, /birth-sky-dialog|lib\/birth-sky\/(draw|render)/);
 });
diff --git a/frontend/tests/profile-onboarding-birth-sky-reveal.test.ts b/frontend/tests/profile-onboarding-birth-sky-reveal.test.ts
index b12236a1..a1bd07e1 100644
--- a/frontend/tests/profile-onboarding-birth-sky-reveal.test.ts
+++ b/frontend/tests/profile-onboarding-birth-sky-reveal.test.ts
@@ -32,8 +32,7 @@ const revealHook = readFileSync(new URL("../src/hooks/use-birth-sky-reveal.ts",
 const revealComponent = readFileSync(new URL("../src/components/birth-sky/birth-sky-reveal.tsx", import.meta.url), "utf8");
 const converge = readFileSync(new URL("../src/components/birth-sky/birth-sky-converge.tsx", import.meta.url), "utf8");
 const convergeCss = readFileSync(new URL("../src/components/birth-sky/birth-sky-converge.css", import.meta.url), "utf8");
-const dialog = readFileSync(new URL("../src/components/birth-sky/birth-sky-dialog.tsx", import.meta.url), "utf8");
-const dialogCss = readFileSync(new URL("../src/components/birth-sky/birth-sky.css", import.meta.url), "utf8");
+const replay = readFileSync(new URL("../src/components/birth-sky/birth-sky-replay.tsx", import.meta.url), "utf8");
 const voice = readFileSync(new URL("../docs/VOICE.md", import.meta.url), "utf8");
 
 const cover: BirthSkyRevealSky = { sky: goldenSky("day"), serif: true };
@@ -232,7 +231,12 @@ test("overlay: full screen, no buttons; tap, click or Esc ends it at once; rAF s
   assert.match(revealComponent, /dynamic\(\s*\(\) => import\("\.\/birth-sky-converge"\)/);
   assert.match(revealComponent, /<BirthSkyConverge reveal=\{cover\} onDone=\{onClose\} \/>/);
   assert.doesNotMatch(converge, /<Button|<button|继续|Spinner/);
-  assert.match(converge, /layer\.addEventListener\("pointerdown", finish\)/);
+  // 原值：`layer.addEventListener("pointerdown", finish)`
+  // 新值：`onPointerDown = mode === "hold" ? skip : finish`，首页过场（reveal）仍是点一下就结束
+  // 原因：M4 星盘页定格模式里点一下只跳到定格帧、不关闭；首页过场行为不变
+  assert.match(converge, /const onPointerDown = mode === "hold" \? skip : finish;/);
+  assert.match(converge, /layer\.addEventListener\("pointerdown", onPointerDown\)/);
+  assert.match(converge, /mode = "reveal"/);
   assert.match(converge, /layer\.addEventListener\("cancel", cancel\)/);
   assert.match(converge, /requestAnimationFrame\(tick\)/);
   assert.match(converge, /window\.devicePixelRatio/);
@@ -256,7 +260,12 @@ test("the hint is the VOICE line, shown once after the overlay ends", () => {
   assert.match(revealHook, /from "sonner"/, "reuses the app's Toaster, no new component");
 });
 
-test("the chart page dialog no longer has a reveal variant (「继续」, is-reveal)", () => {
-  assert.doesNotMatch(dialog, /reveal|继续/);
-  assert.doesNotMatch(dialogCss, /is-reveal|birth-sky-reveal/);
+// 原值（测试名与断言）：the chart page dialog no longer has a reveal variant——读 `birth-sky-dialog.tsx` / `birth-sky.css`，不得有「继续」/ is-reveal
+// 新值：the chart page replay has no 「继续」 and the poster dialog is gone——两个文件已删除，星盘页改用 `birth-sky-replay.tsx`
+// 原因：TASK-mobile-chart-and-confirmed-edit-20260929 M4 用重放定格替换静态海报弹层
+test("the chart page replay has no 「继续」 and the poster dialog is gone", () => {
+  assert.doesNotMatch(replay, /继续|is-reveal/);
+  for (const gone of ["birth-sky-dialog.tsx", "birth-sky.css"]) {
+    assert.throws(() => readFileSync(new URL(`../src/components/birth-sky/${gone}`, import.meta.url), "utf8"), /ENOENT/);
+  }
 });