verify(dock): 验证取消悬浮闪帧概率显著降低 / Verify substantially reduced Dock demotion flicker frequency

中文：
- 对应尝试提交：2cb1d05
- 用户在开启毛玻璃并点击 Dock 外取消悬浮的原始实机场景中确认，闪帧出现概率已经大幅降低，本轮改善验收通过

English:
- Corresponding try commit: 2cb1d05
- In the original runtime scenario with acrylic enabled and the Dock demoted by clicking outside it, the user confirmed that flicker frequency was substantially reduced and accepted this improvement

验证 / Validation:
- 用户实机观察（通过：闪帧概率大幅降低） / User runtime observation (passed: flicker frequency substantially reduced)
- 2cb1d05 已通过 scripts\build.bat --reload-shell 和 scripts\test.bat（103/103） / 2cb1d05 passed scripts\build.bat --reload-shell and scripts\test.bat (103/103)

限制 / Limitations:
- 本次结论是概率显著降低，未确认闪帧已经完全消除
- This validation confirms a substantial frequency reduction, not complete elimination of the intermittent flicker

Author: FreeFallingSnow