[Bug] Compatibility notification and theme deformation on Xiaomi devices

[nqmgaming]

User reported on Google Play: '好用，软件兼容提醒没做好。提醒小米用户安装失败记得把系统优化关了，安装完成再打开，页面主题变形重启手机就好了。目前没发现对使用有什么影响'

Translation: The software compatibility reminder is not well done. Remind Xiaomi users to turn off system optimization if installation fails, and turn it back on after installation. The page theme deforms, but restarting the phone fixes it.

Tasks:

• Improve software compatibility reminder for Xiaomi devices (remind to turn off MIUI optimization if installation fails).
• Investigate theme deformation issue after installation on Xiaomi devices.

[nqmgaming]

Addressed in d92ba4d, but not verified on real hardware — I have no Xiaomi device. Leaving this open until someone confirms.

Two parts:

Install failures. When an install fails on Xiaomi, Redmi or POCO hardware, the error now explains the MIUI/HyperOS optimization workaround instead of leaving the user with a bare "installation failed". There is also a new onboarding page with the same guidance, shown only on those devices.

Theme deformation. This one is not an app bug. Turning off MIUI optimization is what changes how the system renders — the reporter needing a phone restart rather than an app restart is the giveaway, since app-local state dies with the process. So the app now warns that the UI may look wrong while the setting is off and that a reboot restores it, and to turn it back on after installing.

If anyone here has a Xiaomi device: a build is at https://github.com/pass-with-high-score/universal-installer/actions/runs/30727692520 → debug-apks (GitHub login needed, expires in 14 days). Debug-signed with the same package name as Play, so the current copy has to be uninstalled first.

What would confirm it: trigger a failed install and check the error mentions MIUI optimization rather than just failing.