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/renderer/shared/ui/controls.tsx

@@ -17,6 +17,7 @@ type ButtonProps = {
   iconOnly?: boolean;
   /** Позиция тултипа относительно кнопки. */
   tooltipPlacement?: 'top' | 'bottom' | 'bottom-left';
+  'data-testid'?: string;
 };
 
 export function Button({
@@ -28,6 +29,7 @@ export function Button({
   ariaLabel,
   iconOnly = false,
   tooltipPlacement = 'top',
+  'data-testid': testId,
 }: ButtonProps) {
   const btnRef = useRef<HTMLButtonElement | null>(null);
   const hostRef = useRef<HTMLSpanElement | null>(null);
@@ -85,6 +87,7 @@ export function Button({
       className={btnClass}
       disabled={disabled}
       aria-label={ariaLabel}
+      data-testid={testId}
       onClick={disabled ? undefined : onClick}
       onMouseEnter={disabled ? undefined : showTip}
       onMouseLeave={disabled ? undefined : hideTip}