feat(lyrics): keep the screen awake while viewing lyrics

lib/screens/settings/lyrics_settings_page.dart

@@ -34,6 +34,15 @@ class LyricsSettingsPage extends ConsumerWidget {
             SliverToBoxAdapter(
               child: SettingsGroup(
                 children: [
+                  SettingsSwitchItem(
+                    icon: Icons.light_mode_outlined,
+                    title: context.l10n.lyricsKeepScreenOn,
+                    subtitle: context.l10n.lyricsKeepScreenOnSubtitle,
+                    value: settings.keepScreenOnLyrics,
+                    onChanged: (value) => ref
+                        .read(settingsProvider.notifier)
+                        .setKeepScreenOnLyrics(value),
+                  ),
                   SettingsSwitchItem(
                     icon: Icons.subtitles_outlined,
                     title: context.l10n.optionsEmbedLyrics,

lib/screens/settings/settings_search_catalog.dart

@@ -307,6 +307,12 @@ class SettingsSearchCatalog {
         ),
       ],
       lyrics = [
+        SettingsSearchEntry(
+          icon: Icons.light_mode_outlined,
+          title: l10n.lyricsKeepScreenOn,
+          subtitle: l10n.lyricsKeepScreenOnSubtitle,
+          keywords: const ['screen timeout', 'awake', 'sleep', 'layar'],
+        ),
         SettingsSearchEntry(
           icon: Icons.subtitles_outlined,
           title: l10n.optionsEmbedLyrics,