Body:
- APK built in December 2024 with flet 0.28.3 works fine
- Same code rebuilt now shows white screen
- Even a simple 5-line "Hello World" app shows white screen
- Tested on same Android device
- Tried pinning flet==0.28.3, Flutter 3.29.2, ubuntu-22.04 - still white screen
This appears to be a regression in the build process.