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/npcs/NpcGraph.tsx

@@ -302,7 +302,7 @@ function FilterToolbar({
   return (
     <Panel position="top-left">
       <Select
-        className={styles.filterSelect}
+        {...(styles.filterSelect ? { className: styles.filterSelect } : {})}
         ariaLabel={ui.graphFilter}
         value={value}
         onChange={(next) => onChange(next as GraphGroupFilter)}