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/shared/graph/storylineExportImport.ts

@@ -22,6 +22,7 @@ import {
   asSceneNpcTokenId,
   asTokenId,
 } from '../types/ids';
+import { normalizeNpcExternalUrl } from '../types/npcExternalUrl';
 
 import {
   getConnectedComponent,
@@ -700,6 +701,7 @@ export function mergeStorylinesIntoProject(
       disposition: n.disposition === 'hostile' || n.disposition === 'friendly' ? n.disposition : 'neutral',
       imageOffset: n.imageOffset ?? { x: 0, y: 0 },
       imageScale: typeof n.imageScale === 'number' && Number.isFinite(n.imageScale) ? n.imageScale : 1,
+      externalUrl: normalizeNpcExternalUrl(n.externalUrl),
     });
     npcNameKeys.add(name.toLowerCase());
     npcsCreated += 1;