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/docs/ui-elements.json

@@ -264,6 +264,16 @@
       "condition": "sensor_dialog_open",
       "purpose": "the pickers' dialog plus the calibration facts that follow them; non-modal and built on first use",
       "elements": [
+        { "id": "dialog_profile_scroll", "path": "sensor_dialog.profile_scroll", "objectName": "sensorProfileScroll", "class": "QScrollArea",
+          "purpose": "bounded scroll area for the selected profile's description and verdict: a long warning list stays readable without growing the dialog into the calibration section" },
+        { "id": "dialog_live_calibration_title", "path": "sensor_dialog.choice_title", "objectName": null, "style": "panelTitle", "class": "QLabel",
+          "purpose": "heading of the live-calibration choice, the section 3d2fb0c added so the running chain's calibration can be changed from the dialog" },
+        { "id": "dialog_live_calibration_combo", "path": "sensor_dialog.calibration_combo", "objectName": "liveCalibrationCombo", "class": "QComboBox",
+          "purpose": "which calibration the live chain uses: the profile's declared file, a browsed one, or raw force; 应用 hands it to the session" },
+        { "id": "dialog_browse_calibration", "path": "sensor_dialog.btn_browse", "objectName": null, "class": "QPushButton",
+          "purpose": "pick a calibration file that is not the profile's declared one, and persist that choice" },
+        { "id": "dialog_device_edit", "path": "sensor_dialog.device_edit", "objectName": "liveDeviceEdit", "class": "QLineEdit",
+          "purpose": "the Finger device serial the browsed calibration claims; shown only for a Finger file, and a mismatch is refused before it is applied" },
         { "id": "dialog_calibration_title", "path": "sensor_dialog.calib_title", "objectName": null, "style": "panelTitle", "class": "QLabel",
           "purpose": "heading of the calibration half" },
         { "id": "dialog_version_label", "path": "sensor_dialog.version_label", "objectName": null, "style": "panelMeta", "class": "ShrinkableLabel",
@@ -283,7 +293,7 @@
         { "id": "dialog_export", "path": "sensor_dialog.btn_export", "objectName": null, "class": "QPushButton",
           "purpose": "write the calibration panel's coefficients (the panel's own action)" },
         { "id": "dialog_apply", "path": "sensor_dialog.btn_apply", "objectName": null, "class": "QPushButton",
-          "purpose": "push the last export into the running device" },
+          "purpose": "hand the dialog's live-calibration choice to the session: remembered for the next run, and hot-updated into a device that is already acquiring (3d2fb0c moved it off the last export)" },
         { "id": "dialog_save", "path": "sensor_dialog.btn_save", "objectName": null, "class": "QPushButton",
           "purpose": "keep the current sensor and calibration choice and dismiss the dialog" }
       ]