fix: scene clear race, path editor anchors, avatar cover, team color crash

Clear scene now patches traps/tokens/npcTokens atomically and updateScene merges against a fresh scene snapshot. Align NPC path-editor previews on token center, default new paths to fixed facing, size avatars by natural aspect for cover, and read team color synchronously from the picker.

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

app/renderer/tokenPathEditor/TokenPathEditorApp.module.css

@@ -133,6 +133,14 @@
   background: rgba(0, 0, 0, 0.25);
 }
 
+/* NPC: center-anchor like SceneEditor `.sceneNpcToken`; no box chrome (ring is on PlayerTokenView). */
+.tokenPreviewNpc {
+  position: absolute;
+  z-index: 3;
+  pointer-events: none;
+  overflow: visible;
+}
+
 .tokenPreview img {
   width: 100%;
   height: 100%;