回放并入主窗口，并修掉开场尖峰 / 录制时长 / 录制帧率 / 回放被摄像头覆盖等 9 项评审问题 - What: 回放不再是独立窗口——删除 PlaybackDialog，拆成 replay.py::ReplayController（读盘、游标、深度重算，只发信号）与 ui/replay_bar.py（录制选择、可拖拽进度条、单位、重算深度、提示行），品牌轨「历史回放」直接换主窗口布局，文件菜单两条入口都切到该视图，曲线改读 RecordingCurveSource（区间按需读盘 + 缓存包络），2D 面板切「原始图像 / 深度图」；传感器与标定合并到 SensorDialog（类型/配置下拉 + 当前生效标定 + 最近导出系数），标定面板加纵向滚动区、九按钮两行、六列表头 ResizeToContents。评审 9 项：1) 开场尖峰两个根因——push() 遇单位变化只记 _unit 而保留旧单位样本（raw 计数被画在牛顿轴上），改为「切换即换单位」：清缓冲按新单位重建、触发切换的那一帧仍刷数值卡；_start_run 先 session_store.reset() 再 set_store()，新会话不再带上次的尾巴（复现脚本 .repro/probe_item1.py：旧 39 样本峰值 9.841 → 新 37 样本峰值 2.390）。2) 箭头页脚改为「箭头按位移放大 ×{factor}」。3) 表头单位芯片由只读 QLabel 改为可点按钮，一次点击同时改曲线、数值卡与设置区下拉。4-6) 全程总览/框选/返回最新 改为 ui/icons.py 按主题令牌运行时绘制的图标，tooltip 与 accessibleName 保留文字，全程总览区域名仍是文字。7) stats() 在录制进行中即返回 _last_t - _t0，记录条开始计时（此前只在 _finalise 写、整场停在 00:00.0）。8) 容器 fps 改用传感器配置的速率（packet.fps 是"每秒完成多少帧"的计数器，突发/文件源会读到 48），视频按 1/fps 节流并把超前的帧计入 resampled_video（frames.csv/forces.csv 一行不少，报告写明原因），session.json 同时记 fps 与 measured_fps。9) _replay_owns_image() 让回放视图独占 2D 面板，实时帧不再覆盖；push() 在录制源挂载时连单位都不切，曲线/数值卡/单位一并归录制。附带：数值卡改读游标处样本（_readout_at_cursor）、回放按录制实际有的单位打开（_replay_unit_for + ReplayController.set_unit，避免 raw-only 录制在 newton 偏好下画三张空图）、视频速率下限。 - Why: 用户评审 9 点，其中 1/7/8/9 是代码缺陷（开场尖峰、录制时长不更新、录制 48fps 与实际 30fps 不符、回放时 2D 面板仍被摄像头刷新），2-6 是可读性问题（×2 含义不明、单位与视图控制应可点/应符号化）。 - Verification: ui_check.py 524 项 0 失败（新增 chart header and unit chip / acquisition correctness / replay owns the 2D pane 三段）、test_ui_smoke.py 69 项 0 失败（新增 7 个回归用例：单位切换不混单位、单位芯片、图标语义、录制中时长、传感器帧率+节流、回放独占面板、回放游标读数与单位回退）、drive_shared.py 146 项 0 失败、locale_studio.py（268 键齐全、zh==en、prefs 对齐）、reproduce.py、ui_snapshot.py 四张复核图（深色实时/回放、浅色 1280x720 实时与标定）。 - Not in this change: 录制文件格式（forces.csv 列序、frames.csv、session.json 路径与分段规则）不变，节流只影响"哪些帧进视频"，并显式计数上报；三维面板仍是占位符。

apps/studio/tools/ui_snapshot.py

@@ -35,15 +35,72 @@ if sys.platform == "win32" and "QT_QPA_FONTDIR" not in os.environ:
 os.chdir(APP_ROOT)
 
 
+def _replay_data(window, app) -> Path:
+    """Synthesize one short recording (with visible frames) and open it."""
+    import numpy as np
+
+    from orisys_app_shared.record import ExperimentRecorder, RecordConfig
+
+    from ui_check import _fake_packet
+
+    root = APP_ROOT / "outputs" / "_snapshot_replay"
+    if root.exists():
+        import shutil
+
+        shutil.rmtree(root, ignore_errors=True)
+    root.mkdir(parents=True, exist_ok=True)
+    recorder = ExperimentRecorder(RecordConfig(video=True, fps=30.0, segment_seconds=30.0))
+    recording = Path(
+        recorder.start(
+            root=root,
+            session_id=1,
+            metadata={
+                "device": {
+                    "sensor_type": "box",
+                    "config_ref": str(root / "sensor.json"),
+                    "config_sha256": "snapshot",
+                },
+                "versions": {"sdk": "snapshot"},
+                "depth": {"stored": False, "replay": "recompute"},
+            },
+        )
+    )
+    # A recognisable frame: a horizontal gradient with a bright bar, so the
+    # replay's "recorded image" view is reviewable instead of black.
+    height, width = 108, 192
+    frame = np.zeros((height, width, 3), np.uint8)
+    frame[:, :, 1] = np.linspace(20, 200, width, dtype=np.uint8)[None, :]
+    frame[height // 3 : 2 * height // 3, :, 2] = 180
+    for index in range(150):
+        recorder.on_packet(_fake_packet(index, frame=frame))
+    recorder.stop()
+    return recording
+
+
 def _run_scene(window, app, scene: str):
     """Drive the window into a scene that would otherwise need hardware.
 
     ``recording`` mocks the record channel's stats through the same single seam
     the app reads them from (``_record_stats``), so nothing is written to disk
     and no device is opened: the render is of the real widgets, not of a mockup.
+    ``replay`` writes one short synthetic recording and opens it in the replay
+    view, which is the only way to review the progress bar without a session.
     """
     from ui_check import _fake_packet, _StuckWorker
 
+    if scene == "replay":
+        window.brand_bar.btn_playback.click()
+        for _ in range(4):
+            app.processEvents()
+        recording = _replay_data(window, app)
+        window._load_recording(recording)
+        # Park the playhead where the bar and the charts show a real position.
+        window.replay.set_position(window.replay.duration_s() * 0.4)
+        window.arrow_panel.set_view_mode("recorded")
+        for _ in range(6):
+            app.processEvents()
+        return
+
     stuck = _StuckWorker()
     window._ensure_workers = lambda: None
     window._box_worker = stuck
@@ -160,12 +217,14 @@ def main() -> int:
     parser.add_argument("--demo", action="store_true", help="inject demo plot/table data")
     parser.add_argument(
         "--scene",
-        choices=("idle", "connecting", "recording"),
+        choices=("idle", "connecting", "recording", "replay"),
         default="idle",
         help=(
             "connecting renders the Stop/cancel state of a hung device open; "
             "recording renders the record strip of a running recording "
-            "(mocked stats: no file is written, no device is opened)"
+            "(mocked stats: no file is written, no device is opened); "
+            "replay writes one short synthetic recording and opens it in the "
+            "replay view so the progress bar can be reviewed"
         ),
     )
     parser.add_argument("--out", required=True, help="output PNG path")
@@ -203,6 +262,9 @@ def main() -> int:
     window.show()
     app.processEvents()
 
+    if args.demo and args.scene == "replay":
+        pass  # the recording is the demo data
+
     if args.scene == "connecting":
         # A device open that never returns: the state the Stop button must
         # survive. ``ui_check._StuckWorker`` drives the same window state.
@@ -211,7 +273,10 @@ def main() -> int:
     if args.scene == "recording":
         _run_scene(window, app, "recording")
 
-    if args.demo:
+    if args.scene == "replay":
+        _run_scene(window, app, "replay")
+
+    if args.demo and args.scene != "replay":
         _demo_data(window)
         for _ in range(4):
             app.processEvents()