feat(npcs): inspect cards, Show overlay, and optional external link

Clicking an NPC tile opens description cards (multi-select accordion); Show puts avatars on screen. Optional URL opens a webview tab. Avatar pan in the editor commits on pointer up.

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

app/renderer/shared/npcs/useNpcsOverlayState.ts

@@ -13,10 +13,19 @@ export function useNpcsOverlayState(): readonly [
 
   useEffect(() => {
     void api.invoke(ipcChannels.npcsOverlay.getState, {}).then((r) => {
-      setState(r.state);
+      const next = r.state;
+      setState({
+        ...next,
+        inspectNpcIds: next.inspectNpcIds ?? [],
+        inspectFocusNpcId: next.inspectFocusNpcId ?? null,
+      });
     });
     return api.on(ipcChannels.npcsOverlay.stateChanged, ({ state: next }) => {
-      setState(next);
+      setState({
+        ...next,
+        inspectNpcIds: next.inspectNpcIds ?? [],
+        inspectFocusNpcId: next.inspectFocusNpcId ?? null,
+      });
     });
   }, [api]);