Three new Linux startup cases, one isolate each (a second VideoPlayerScreen
in one isolate never reaches initialize):
- A custom mpv config naming vo/gpu-context/gpu-api cannot detach the
embedded renderer: the writes are withheld by name while ordinary entries
(sub-scale) still land.
- Unparseable stored subtitle colours (named, 3-digit hex) reach the wire
canonicalized to the defaults, proving the OPT_COLOR sanitization.
- A refused sub-color write no longer aborts initialization: the write is
attempted, contained, and playback continues past the styling block.
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