Show model loading failures to users - #108
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Summary
Why
mlx-vlm now returns actionable HTTP 400 details when a model cannot be loaded (Blaizzy/mlx-vlm#1717), but Nativ did not consistently surface those details. Startup failures could leave the UI looking like it was still loading, and clicking a cached model with no supported preload role was a silent no-op.
User impact
Users now get the server's useful failure reason in the workflow where loading failed and in app-wide status surfaces. Unsupported models are visibly marked and explain that Nativ cannot use them for its supported serving roles.
Validation
xcodebuild -project Nativ.xcodeproj -scheme Nativ -destination 'platform=macOS,arch=arm64' CODE_SIGNING_ALLOWED=NO test— 92 tests passedpython3 -m py_compile PythonDistribution/Overlay/nativ_server.py PythonDistribution/Scripts/build_mlx_vlm_server.pygit diff --check