The separate player window could be resized below what the corner layout
needs. Free resize now floors at the corner layout's minimum (its width
threshold, the narrowest side column plus a video column wide enough for
the control bar, and 600pt tall), and an undersized window grows to it
when the corner layout takes over. The video column minimum is 560pt on
macOS so the control bar capsule fits.
The control bar's fixed 650pt frame also widened the controls stack past
a narrower video column, clipping the top bar's avatar and close button;
the frame is now capped to the container width.
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