fix: rebuild propre — 1 seul bundle, plugin clean-assets avant chaque build

frontend/vite.config.js

@@ -1,11 +1,21 @@
 import { defineConfig } from 'vite';
 import react from '@vitejs/plugin-react';
+import { rmSync } from 'fs';
+import path from 'path';
+
+// Plugin qui nettoie uniquement public/assets/ avant chaque build
+const cleanAssetsPlugin = () => ({
+  name: 'clean-assets',
+  buildStart() {
+    const dir = path.resolve(__dirname, '../backend/public/assets');
+    try { rmSync(dir, { recursive: true, force: true }); } catch {}
+  },
+});
 
 export default defineConfig({
-  plugins: [react()],
+  plugins: [react(), cleanAssetsPlugin()],
   server: {
     proxy: {
-      // En dev local, proxy /api → Symfony (port 8000)
       '/api': {
         target:      'http://localhost:8000',
         changeOrigin: true,
@@ -14,6 +24,6 @@ export default defineConfig({
   },
   build: {
     outDir:    '../backend/public',
-    emptyOutDir: false, // ne pas supprimer index.php, .htaccess Symfony, etc.
+    emptyOutDir: false, // ne pas supprimer index.php
   },
 });