ui: fix VITE_PUBLIC_SERVER variable reading (#24845)

tools/ui/vite.config.ts

@@ -10,10 +10,9 @@ import { SvelteKitPWA } from '@vite-pwa/sveltekit';
 import { playwright } from '@vitest/browser-playwright';
 import { dirname, resolve } from 'path';
 import { fileURLToPath } from 'url';
-import { defineConfig, searchForWorkspaceRoot } from 'vite';
+import { defineConfig, loadEnv, searchForWorkspaceRoot } from 'vite';
 
 const __dirname = dirname(fileURLToPath(import.meta.url));
-const SERVER_ORIGIN = import.meta.env?.VITE_PUBLIC_SERVER_ORIGIN || 'http://localhost:8080';
 // eslint-disable-next-line @typescript-eslint/no-explicit-any
 const browserBaseConfig: any = {
 	enabled: true,
@@ -25,7 +24,11 @@ const browserBaseConfig: any = {
 	})
 };
 
-export default defineConfig({
+export default defineConfig(({ mode }) => {
+	const env = loadEnv(mode, process.cwd(), 'VITE_PUBLIC_');
+	const SERVER_ORIGIN = env.VITE_PUBLIC_SERVER_ORIGIN || 'http://localhost:8080';
+
+	return {
 		build: {
 			assetsInlineLimit: 32000,
 			chunkSizeWarningLimit: 3072,
@@ -101,4 +104,5 @@ export default defineConfig({
 				}
 			]
 		}
+	};
 });