fix: pixi v7 isInteractive TypeError + outfit texture swap

- Added isInteractive() stub on Live2DModel to prevent
  'e.isInteractive is not a function' errors in pixi v7
- Swapped outfit texture loading to use Assets.load() with
  cascading fallbacks (model.setTexture -> internalModel -> coreModel)
- Removed unused Texture import

frontend/src/components/KiraAvatar.tsx

@@ -48,7 +48,7 @@ export default function KiraAvatar(props: Props) {
         }
 
         await loadScript('/live2d/cubism/live2dcubismcore.min.js');
-        const { Application, Texture } = await import('pixi.js');
+        const { Application } = await import('pixi.js');
         const { Live2DModel } = await import('pixi-live2d-display/cubism4');
 
         // Responsive sizing
@@ -81,6 +81,9 @@ export default function KiraAvatar(props: Props) {
 
         app.stage.addChild(model as any);
 
+        // Fix: prevent pixi v7 isInteractive TypeError with Live2D model
+        (model as any).isInteractive = () => false;
+
         // Store reference to texture_02 for outfit swapping
         try {
           textureRef.current = {
@@ -166,10 +169,20 @@ export default function KiraAvatar(props: Props) {
 
     (async () => {
       try {
-        const { Texture, BaseTexture } = await import('pixi.js');
-        const base = await BaseTexture.from(outfitUrl);
-        const tex = new Texture(base);
-        model.internalModel.coreModel.setTexture(2, base);
+        const { Assets, Texture } = await import('pixi.js');
+        const tex = await Assets.load(outfitUrl);
+        // Swap texture slot 2 (clothing layer)
+        if ((model as any).setTexture) {
+          (model as any).setTexture(2, tex);
+        } else {
+          // Fallback: try internal model
+          try {
+            (model.internalModel as any).setTexture(2, tex);
+          } catch {
+            // Fallback: direct core model
+            (model.internalModel.coreModel as any).setTexture(2, tex);
+          }
+        }
       } catch (e) {
         console.warn('[Outfit] texture swap failed:', e);
       }