采集循环只认新帧，选区统计移到数值卡，状态栏改为会过期的通知行 - What: 1) 选区统计不再挤在曲线下方（中文长句会顶出面板右边界）——框选后三个数值卡的大号数字变成该窗口的峰值、下方小字为该窗口的均值·σ（chart.selection_detail），峰值语义放在卡片 tooltip；曲线下方只保留「选区 4.00s / 121 点」（完整一行留在它的 tooltip 里）。「全程总览」不算选区（那是默认适配），此时卡片回到"游标处样本"；切换单位/换数据源/返回最新都会正确切回。2) 上方的 63.0 FPS 是采集循环自己的轮询速率，根因是同一帧被反复当成新样本：CaptureSource.read_latest 返回后台线程的最新帧，没有新帧时把同一帧再给一次，循环未做判断，于是 30 fps 的设备录出约 63 行/秒（frame_id 还各不相同）。新增 _capture_sequence()：读 capture_source.status.last_seq，计数未变即"还没有新帧"，睡 2 ms 重试、不进处理链、不发 packet；只有带后台读取线程的实时相机有该标记，视频文件是同步解码、每次都取下一帧，因此忽略（行为不变）。packet.fps 改为速率 (窗口帧数-1)/(首末到达差)，窗口 1 s——按"1 秒内到达几帧"数数会系统性偏大。容器速率仍取传感器配置值，与此层无关。3) 底部状态栏只留一次性通知：删除右下角常驻「配置 sensor.json」（顶栏摘要按钮已写明），删除与顶栏重复的 status.run_started（运行中（0））与 status.connecting（正在连接…）；QStatusBar 换成 _NoticeBar——Qt 的 showMessage(text) 默认 msecs=0 表示永不消失，这正是那句「运行中（0）」一直挂到底部的原因，子类统一补 6 秒超时；status.units_raw_fallback 之前每帧都发（等于永久占住通知行），改为每次运行只提示一次。附带修复：英文下表头模式名被截断（长句移入 tooltip，标签只留模式名 chart.mode_*_tip）；数据源切换后曲线下方的选区文案会残留，改为在 _on_source_changed 里清零。 - Why: 用户评审 3 点——选区统计显示不全、顶部 fps 应受硬件限制最大 30、右下角配置文件名与左下角「运行中（0）」和顶栏信息重复。第 2 点查出根因是重复采样（数据缺陷，不只是显示问题），修掉后设备速率与记录行数才真正一致。 - Verification: ui_check.py 546 项 0 失败（新增：选区统计在卡片、卡片小字不裁切、状态栏无常驻标签且消息过期、顶栏 FPS 即 packet 交付速率、表头模式名中英不裁切）；test_ui_smoke.py 71 项 0 失败（新增选区读数与通知行过期两例）；drive_shared.py 148 项 0 失败（新增 shared/tests/test_worker_frame_rate.py：同一帧返回 3 次时 packet 数≈交付帧数，去掉判据为 11317:39，且 fps 与交付速率一致）；locale_studio.py 267 键齐全、zh==en、prefs 对齐；reproduce.py 退出 0；ui_snapshot.py 新增 --select A,B，六张复核图（选区中英、实时、录制中、回放、标定 1280x720）。 - Not in this change: 录制文件格式与 CSV 列序不变；去重只影响"哪些帧算一帧"，视频文件源行为不变；曲线下方不再显示三通道峰/均/σ（数值在卡片上，完整一行在 tooltip 里）。

apps/studio/tools/ui_check.py

@@ -910,15 +910,21 @@ def main() -> int:
             not rail_squeezed(window),
             f"{theme}: the status rail squeezes {rail_squeezed(window)}",
         )
-        check(
-            "sensor.json" in window.device_label.text(),
-            f"{theme}: the status bar does not name the config file: "
-            f"{window.device_label.text()!r}",
-        )
         check(
             not hasattr(window.toolbar, "source_combo"),
             f"{theme}: the source mode is still a combobox",
         )
+        # The status bar is a notice line, not a second state line: the config
+        # file and the phase are already on the rail, and a message must expire.
+        check(
+            not hasattr(window, "device_label"),
+            f"{theme}: the status bar still carries a permanent device line",
+        )
+        window.statusBar().showMessage("notice")
+        check(
+            window.statusBar().currentMessage() == "notice",
+            f"{theme}: the status bar does not show a message at all",
+        )
 
         # The sensor dialog owns the pickers and the calibration facts.
         window._open_sensor_dialog()
@@ -1617,6 +1623,29 @@ def main() -> int:
         f"the arrow footer does not say what is magnified: "
         f"{header_window.arrow_panel.scale_label.text()!r}",
     )
+    # The header's mode label shares its row with three icon buttons and the unit
+    # chip: the long form of the mode sentence was cut mid-word in English.
+    for lang in ("zh_CN", "en_US"):
+        header_window._set_language(lang)
+        for _ in range(3):
+            app.processEvents()
+        for mode, name in ((False, "follow"), (True, "browse")):
+            if mode:
+                header_plots.set_window(0.2, 1.0)
+            app.processEvents()
+            label = header_plots.mode_label
+            check(
+                label.width() >= label.sizeHint().width(),
+                f"{lang}/{name}: the chart mode label is clipped: "
+                f"{label.width()} < {label.sizeHint().width()} ({label.text()!r})",
+            )
+            check(
+                label.toolTip() != "",
+                f"{lang}/{name}: the mode label does not explain itself",
+            )
+    # The locale is process-wide: leave it where the other sections expect it.
+    header_window._set_language("zh_CN")
+    app.processEvents()
     header_window.close()
     app.processEvents()
 
@@ -1761,6 +1790,25 @@ def main() -> int:
     finally:
         app_module.recordings_dir = original_root
         _shutil.rmtree(scratch, ignore_errors=True)
+
+    # The rail's FPS is the worker's *delivered* frame rate. It used to be a count
+    # of loop iterations (a 30 fps device read 63), so the number the rail prints
+    # must be the packet's, verbatim.
+    window.act_show_fps.setChecked(True)
+    app.processEvents()
+    packet = _fake_packet(0, mono_t=0.0)
+    packet.fps = 30.4
+    stuck.emit(packet)
+    window._on_run_tick()
+    app.processEvents()
+    check(
+        "30.4 FPS" in window.toolbar.source_summary.text(),
+        f"the rail does not show the delivered frame rate: "
+        f"{window.toolbar.source_summary.text()!r}",
+    )
+    window.act_show_fps.setChecked(False)
+    app.processEvents()
+
     window._stop_run(reason="user_stop")
     stuck.release()
     app.processEvents()
@@ -2460,9 +2508,16 @@ def main() -> int:
         all(plot.getViewBox().state["mouseEnabled"][0] for plot in plots.plots),
         "browsing does not enable panning",
     )
-    window_texts = plots.stats_label.text()
-    check(window_texts != "", "no selection statistics in browse mode")
-    check("峰" in window_texts, f"the peak is missing from the readout: {window_texts!r}")
+    # "Whole session" is the default fit, not a selection: the cards still state
+    # the sample under the cursor, and the strip carries no selection summary.
+    check(
+        plots._selection is None,
+        "fitted to the whole session, the cards still hold selection statistics",
+    )
+    check(
+        plots.stats_label.text() == "",
+        f"a fitted session shows a selection summary: {plots.stats_label.text()!r}",
+    )
 
     # Decimation must keep the spike while bounding the point count.
     drawn = max(int(curve.getData()[0].size) for curve in plots.curves)
@@ -2476,6 +2531,50 @@ def main() -> int:
         plots.overview_curve.getData()[0].size > 0,
         "the whole-session overview strip is empty",
     )
+    # A window narrower than the session is a selection: its peak becomes the big
+    # number on each card and its mean/σ the line under it, while the strip keeps
+    # only the size of the selection (the long per-channel line did not fit).
+    check(plots._selection is not None, "zooming in did not record a selection")
+    summary = plots.stats_label.text()
+    check(summary != "", "the strip does not state the size of the selection")
+    check(
+        "峰" not in summary and "均" not in summary,
+        f"the per-channel statistics are still in the strip: {summary!r}",
+    )
+    check(
+        "选区" in summary or "Selection" in summary,
+        f"the strip does not say that the numbers describe a selection: {summary!r}",
+    )
+    expected_peak = float(plots._selection.peaks[0])
+    peak_text = (
+        f"{expected_peak:.3f}" if plots.unit() == "N" else f"{expected_peak:.1f}"
+    )
+    check(
+        plots.value_labels[0].text() == peak_text,
+        f"the FN card is not the selection's peak: {plots.value_labels[0].text()!r}",
+    )
+    check(
+        plots.value_details[0].text() != ""
+        and ("均" in plots.value_details[0].text() or "mean" in plots.value_details[0].text()),
+        f"the card does not state the selection's mean: "
+        f"{plots.value_details[0].text()!r}",
+    )
+    for card, label, detail in zip(
+        plots.value_cards, plots.value_labels, plots.value_details
+    ):
+        check(
+            detail.width() >= detail.sizeHint().width(),
+            f"the selection detail line is clipped: "
+            f"{detail.width()} < {detail.sizeHint().width()}",
+        )
+    # Leaving the selection hands the cards back to the cursor readout.
+    plots.follow_latest()
+    check(plots._selection is None, "the selection survived 'back to latest'")
+    check(
+        plots.value_details[0].text() == "",
+        f"the mean line survived leaving the selection: "
+        f"{plots.value_details[0].text()!r}",
+    )
 
     # A user gesture (the signal pyqtgraph emits for a wheel/drag) enters browse;
     # "back to latest" must actually leave it.