chore(vite): add asset cleanup before build to prevent accumulation of old files

vite.config.js

@@ -1,7 +1,14 @@
 import path from "path";
+import fs from "fs";
 import vue from "@vitejs/plugin-vue";
 import vuetify from "vite-plugin-vuetify";
 
+// Purge old assets before build to prevent accumulation
+const assetsDir = path.join(__dirname, "meshchatx", "public", "assets");
+if (fs.existsSync(assetsDir)) {
+    fs.rmSync(assetsDir, { recursive: true, force: true });
+}
+
 export default {
     plugins: [vue(), vuetify()],