BiRefNet-Lite times out on first load (~60s+ for 973MB model).
U2-Net works in 2 seconds. Users can still select BiRefNet for
higher quality when they're willing to wait. Added timing hints
in model descriptions and increased timeout for BiRefNet models.
The bridge.ts catch block was catching ALL errors from the venv Python
and falling back to system python3. This masked real script errors
(like rembg model loading failures) by reporting "rembg not installed"
from the system python3 fallback. Now only falls back on ENOENT (venv
binary not found).
Siddharth Kumar Sah