Add details panel preset settings UI and default visibility

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.

Yattee/Views/Settings/PlayerControls/PlayerControlsSettingsView.swift

@@ -398,6 +398,24 @@ private struct LayoutSectionsSection: View {
                 )
             }
             .disabled(!viewModel.canEditActivePreset)
+
+            // The details panel exists in the iOS and macOS players.
+            #if os(iOS) || os(macOS)
+            NavigationLink {
+                PanelSettingsView(viewModel: viewModel)
+            } label: {
+                HStack {
+                    Label(
+                        String(localized: "settings.playerControls.detailsPanel"),
+                        systemImage: "sidebar.trailing"
+                    )
+                    Spacer()
+                    Text("\(viewModel.enabledPanelPageCount)")
+                        .foregroundStyle(.secondary)
+                }
+            }
+            .disabled(!viewModel.canEditActivePreset)
+            #endif
         } header: {
             Text(String(localized: "settings.playerControls.layoutSections"))
         } footer: {