Add fourth sequential asset expansion batch

src/game/data/portraitAssets.ts

@@ -65,6 +65,16 @@ export function portraitTextureKey(key: string) {
   return portraitAssets[slug] ? `portrait-${slug}` : undefined;
 }
 
+export function portraitTextureKeysForKey(key: string) {
+  const slug = portraitSlugForKey(key);
+  const prefix = `${slug}-`;
+  const slugs = Object.keys(portraitAssets)
+    .filter((candidate) => candidate === slug || candidate.startsWith(prefix))
+    .sort();
+
+  return Array.from(new Set(slugs.map((candidate) => `portrait-${candidate}`)));
+}
+
 export function portraitKeyForSpeaker(speaker?: string) {
   return speaker ? speakerPortraitKeys[speaker] : undefined;
 }