feat(players): app Players library and circular NPC tokens on scenes

Add userData players/teams, scene npcTokens with hex-inscribed sizing, session scale synced to presentation, and Playwright e2e coverage.

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

app/shared/graph/sceneListOrder.test.ts

@@ -24,6 +24,7 @@ function scene(id: string): Scene {
     darkenScene: false,
     traps: [],
     tokens: [],
+    npcTokens: [],
     grid: { enabled: false, type: 'square', sizeN: 0.06, color: '#ffffff' },
     media: { videos: [], audios: [] },
     settings: { autoplayVideo: false, autoplayAudio: true, loopVideo: true, loopAudio: true },