fix: correctly deploy element-call widget via vite-plugin-static-copy

The glob pattern dist/* preserved the full node_modules/...  path
when copying to public/element-call/, resulting in only a nested
node_modules directory being deployed (causing 404 on index.html).

Switching to a directory src with rename lets the plugin copy the
dist folder wholesale as public/element-call/.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

vite.config.js

@@ -13,8 +13,9 @@ import buildConfig from './build.config';
 const copyFiles = {
   targets: [
     {
-      src: 'node_modules/@element-hq/element-call-embedded/dist/*',
+      src: 'node_modules/@element-hq/element-call-embedded/dist',
-      dest: 'public/element-call',
+      dest: 'public',
+      rename: 'element-call',
     },
     {
       src: 'config.json',