Text color, border color, background color, border size, and bottom
margin were rendered as static rows on tvOS (ColorPicker and Slider are
unavailable there), so the focus engine skipped over them and they could
never be changed.
Replace them with menu pickers following the existing font size pattern:
- Text/border/background color: 9 preset colors with a swatch in the
row label; stored values snap to the nearest preset
- Background opacity: 25-100% steps (iOS parity, where ColorPicker
supports opacity for the background)
- Border size: 0.0-5.0 in 0.5 steps
- Bottom margin: 0-50% in 5% steps
Verified on tvOS simulator: rows are focusable, selections persist and
are rendered by MPV during playback.
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