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>

playwright.config.ts

@@ -0,0 +1,14 @@
+import { defineConfig } from '@playwright/test';
+
+export default defineConfig({
+  testDir: './e2e',
+  timeout: 90_000,
+  expect: { timeout: 15_000 },
+  fullyParallel: false,
+  workers: 1,
+  retries: 0,
+  reporter: [['list']],
+  use: {
+    trace: 'retain-on-failure',
+  },
+});