fix: Live2D Ticker registration + outfit texture swap path

- Registered pixi Ticker via (Live2DModel as any).registerTicker()
  to fix 'No Ticker registered' warning and animation issues
- Fixed outfit texture swap: textures live on model.textures[]
  not model.internalModel.textures[]

frontend/src/components/KiraAvatar.tsx

@@ -48,9 +48,13 @@ export default function KiraAvatar(props: Props) {
         }
 
         await loadScript('/live2d/cubism/live2dcubismcore.min.js');
-        const { Application } = await import('pixi.js');
+        const { Application, Ticker } = await import('pixi.js');
         const { Live2DModel } = await import('pixi-live2d-display/cubism4');
 
+        // Register pixi Ticker so Live2DModel can drive animations
+        // Cast needed due to pixi-live2d-display expecting older Ticker type
+        (Live2DModel as any).registerTicker(Ticker as any);
+
         // Responsive sizing
         const size = Math.min(container.clientWidth || 260, 260);
         const app = new Application({
@@ -173,8 +177,8 @@ export default function KiraAvatar(props: Props) {
         const tex = await Assets.load(outfitUrl);
         // Swap texture slot 2 (clothing layer) in the model's texture array.
         // The render loop automatically binds WebGL textures from PixiJS textures.
-        if ((model as any).internalModel?.textures) {
-          (model as any).internalModel.textures[2] = tex;
+        if ((model as any).textures) {
+          (model as any).textures[2] = tex;
         } else {
           console.warn('[Outfit] cannot swap — no textures array');
         }