fix: add compilerOptions to Svelte plugin in vitest config

The Svelte plugin was receiving an incomplete config object, causing
Object.values() to fail on undefined in the hot-update plugin.

Added compilerOptions.dev to provide a complete plugin configuration.

dashboard/frontend/vitest.config.js

@@ -2,7 +2,14 @@ import { defineConfig } from 'vitest/config';
 import { svelte } from '@sveltejs/vite-plugin-svelte';
 
 export default defineConfig({
-  plugins: [svelte({ hot: !process.env.VITEST })],
+  plugins: [
+    svelte({
+      hot: !process.env.VITEST,
+      compilerOptions: {
+        dev: true
+      }
+    })
+  ],
   test: {
     globals: true,
     environment: 'jsdom',