feat: save games and edit scene darkness

Persist show state to local saves; author map darkness in scene editor with bake-to-scene and help updates.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/renderer/editor/help/helpLinkify.ts

@@ -8,6 +8,7 @@ export const HELP_SECTION_LINK_ALIASES: Partial<Record<HelpSectionId, readonly s
   effects: ['Эффекты', 'Effects'],
   presentation: ['Презентация', 'Presentation'],
   grid: ['Сетка', 'Grid'],
+  sceneEditor: ['Затемнение сцены', 'Scene darkness', 'Редактор сцены', 'Scene editor'],
   controlPanel: ['Пульт'],
   players: ['Игроки', 'Players'],
   tokens: ['Токены', 'Tokens'],