fix(windows): chrome process idle no rendering - #781
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What?
We stopped relying on Chrome announcing itself. Instead, VHS now starts Chrome on a port it picked itself and simply checks that port directly until Chrome answers. If Chrome never shows up, VHS gives up after 30 seconds with a clear error message instead of hanging forever.
Why?
VHS would freeze forever on Windows when running a tape — no output, no GIF, just Chrome processes sitting idle in the background. Nothing timed out, nothing errored; users had to force-kill it.
Closes #754