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/playerToken/PlayerTokenView.module.css

@@ -0,0 +1,63 @@
+.root {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  gap: 8px;
+  user-select: none;
+}
+
+.circle {
+  position: relative;
+  border-radius: 50%;
+  border: 4px solid #c9a227;
+  overflow: hidden;
+  background: #18181b;
+  box-shadow: 0 4px 18px rgba(0, 0, 0, 0.45);
+  flex-shrink: 0;
+}
+
+.circlePan {
+  cursor: grab;
+  touch-action: none;
+}
+
+.circlePan:active {
+  cursor: grabbing;
+}
+
+.avatar {
+  position: absolute;
+  left: 50%;
+  top: 50%;
+  width: 140%;
+  height: 140%;
+  object-fit: cover;
+  pointer-events: none;
+}
+
+.avatarEmpty {
+  position: absolute;
+  inset: 0;
+  background: repeating-linear-gradient(
+    -45deg,
+    #27272a,
+    #27272a 6px,
+    #3f3f46 6px,
+    #3f3f46 12px
+  );
+}
+
+.namePlate {
+  max-width: 100%;
+  padding: 4px 10px;
+  border-radius: 6px;
+  background: rgba(9, 9, 11, 0.88);
+  color: #fafafa;
+  font-size: 12px;
+  font-weight: 600;
+  line-height: 1.3;
+  text-align: center;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}