Phase 2 of the player panels redesign:
- New "Details Panel" screen in Player Controls settings: page
reorder/enable list with per-page editor (info element toggles),
and a default panel visibility picker (hidden/visible/remember).
- PlayerControlsSettingsViewModel gains panelSettings bindings with
the usual debounced-save flow; the last enabled page cannot be
disabled.
- Built-in presets bumped to v9 with explicit default panelSettings.
- The preset's default visibility now drives the wide-layout panel
on player open and on entering landscape, replacing the hard
hidden resets; "remember" restores the new detailsPanelLastVisible
setting recorded on user toggles. Applied once per expanded player
session (flag on NavigationCoordinator survives re-mounts).
- WideScreenPlayerLayout picks up external visibility writes so the
async-loaded default reaches the mounted layout.
- Unit tests for PanelSettings Codable compatibility (round-trip,
old JSON, unknown page types/discriminators/enum values); removed
stale PlayerInfoTab tests left from Phase 1.
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