Add Android TV side-panel menus

[MattiasBuelens]

Summary

Adds the language and settings menus to android-ui-tv. They open as an M3 modal side sheet on the end edge of the player, styled after YouTube's Android TV player. Names and state overloads mirror the mobile menus (all @ExperimentalTvUiApi):

fun MenuScope.Menu(modifier, title, content: @Composable ColumnScope.() -> Unit) // 320 dp side panel, Back closes it
fun MenuScope.LanguageMenuButton(...) / SettingsMenuButton(...)
fun MenuScope.LanguageMenu()   // "Audio ›", "Subtitles ›" rows -> AudioTrackMenu() / SubtitleMenu()
fun MenuScope.SettingsMenu()   // "Quality ›", "Playback rate ›" rows -> QualityMenu() / PlaybackRateMenu()
fun AudioTrackList(...) / SubtitleTrackList(...) / QualityList(...) / PlaybackRateList(...)

• The panel overlays the full-size video, because the UI lives inside THEOplayer's theo_ui_container. It slides in from the end edge when opened from the controls; switching between menus crossfades.
• Each row is a tv-material ListItem card (surfaceVariant, 8 dp apart). Submenu rows have a leading icon and a trailing ›. The selected list item has a trailing check. When a list opens, it scrolls to and focuses the selected item (focusRestorer(selectedRequester)). Picking an item closes that submenu, the same as mobile.
• Unlike mobile, LanguageMenu only shows the compact rows. There's no expanded side-by-side form, since the panel is narrow.
• The formatting helpers move to :ui-common as @InternalUiApi so both modules can use them: formatTrackName (backing :ui's public formatTrackLabel), formatPlaybackRate, formatBandwidth, formatActiveQualityLabel, defaultPlaybackRates, and the util/ track-label helpers. No public API changes in :ui.

The Robolectric tests drive the menus with D-pad keys, because tv-material components don't react to touch clicks. They cover button visibility, focus on open, track/quality/rate selection, and Back from a submenu, then from the menu, back to the controls.

Link to Devin session: https://dolby.devinenterprise.com/sessions/0a6e1645d4f141408a29401d199e8716
Open in Devin Desktop: https://dolby.devinenterprise.com/desktop/session/0a6e1645d4f141408a29401d199e8716?variant=devin
Requested by: @MattiasBuelens

[devin-ai-integration]

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