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/main/project/zipStore.legacyContract.test.ts

@@ -80,6 +80,11 @@ void test('zipStore: normalizeScene defaults previewThumbAssetId for older proje
   assert.match(src, /function normalizeScene\(/);
 });
 
+void test('zipStore: NPC parse defaults externalUrl', () => {
+  const src = fs.readFileSync(path.join(here, 'zipStore.ts'), 'utf8');
+  assert.match(src, /externalUrl: normalizeNpcExternalUrl/);
+});
+
 void test('zipStore: listProjects skips unreadable archives', () => {
   const src = fs.readFileSync(path.join(here, 'zipStore.ts'), 'utf8');
   assert.match(