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.
Add shared SettingsFormContainer/SettingsFormSection helpers that mirror
the Sources screen styling (uppercase subheadline headers, divider-
bracketed cards, ScrollView + LazyVStack) on macOS while keeping the
standard Form/Section layout on iOS and tvOS.
Convert PlaybackSettingsView and SubtitlesSettingsView to the new
helpers, wrap the macOS Settings detail pane in a NavigationStack so
NavigationLink pushes (Subtitles Appearance) render in the detail
column, fold the macOS-only Player Mode + Auto-resize player controls
into the Behavior section, and drop the unused queue footer.
Introduce PlatformMenuPicker that wraps short-option pickers in
LabeledContent + .pickerStyle(.menu) on tvOS so they render as a
compact dropdown instead of pushing a full-screen option list. On
iOS/macOS it falls through to a plain Picker, leaving rendering
unchanged.
Applied across Playback, Subtitles, Sidebar, Privacy, and Advanced
settings. Long language lists in PlaybackSettingsView are left as
push-style.
