修复 Studio 失败测试并新增合并门禁

把丢失的 box 录像放回 apps/studio/tests/data/，修掉第 3 节 3–10 号与两处过时测试桩，
注册 timing 标记并让根目录收集零错误；新增 tools/gate.ps1 与可选的 pre-push 钩子。
验证：studio 524 通过 19 跳过、shared 467 通过 18 跳过、ui_check 632 项 0 失败、gate.ps1 退出码 0。
细节见 docs/test-repair-plan.zh.md。

apps/studio/tests/test_scene3d_view.py

@@ -49,13 +49,13 @@ from orisys_studio.scene3d.asset_source import (
 )
 from PySide6.QtCore import Signal
 from PySide6.QtWidgets import QWidget
-from tests.conftest import (
+from _studio_helpers import (
     finish_run as _finish,
 )
-from tests.conftest import (
+from _studio_helpers import (
     running_window as _running_window,
 )
-from tests.conftest import (
+from _studio_helpers import (
     show_window as _show,
 )
 
@@ -1131,10 +1131,14 @@ def test_the_replay_view_shows_the_pane_and_says_where_the_field_comes_from(
         assert "回放" in label or "Replay" in label, label
 
         # A running pass means the pixels are recomputed, and the label must say so.
+        # Compared through the locale key rather than a word from it: ``c0a10e6`` reworded
+        # this line ("重算" → "分析结果：非录制时的测量值"), and the claim being defended is
+        # "*which* source the pane says it is showing", not the phrasing.
         window._recompute_running = True
         window._apply_panel_visibility()
-        label = view.panel.source_label.text()
-        assert "重算" in label or "Recomputed" in label, label
+        assert view.panel.source_label.text() == t("scene3d.source_recompute"), (
+            view.panel.source_label.text()
+        )
 
         # Stopping the pass must clear the picture, not leave the last frame up.
         window._recompute_running = False