v1 created a separate Win32 window — same problem as external Chrome.
v2 creates CEF as a CHILD WINDOW of Kivy's SDL_app window:
- No separate taskbar entry
- No z-order fighting (CEF is INSIDE Kivy)
- No desktop flash
- CEF message loop pumped via Kivy Clock (main thread)
- Resize handler attached so CEF follows Kivy window changes
- build.spec includes cef_browser in hidden imports
ske087
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