Create testing specific vite config, add multi font support, bugfixes

vite.config.test.ts

@@ -0,0 +1,18 @@
+import { sveltekit } from '@sveltejs/kit/vite';
+import { defineConfig } from 'vite';
+
+export default defineConfig({
+	plugins: [sveltekit()],
+	build: {
+		sourcemap: true,
+		minify: false,
+		rollupOptions: {
+			output: {
+				manualChunks: undefined // Disable code splitting
+			}
+		}
+	},
+	test: {
+		include: ['tests/**/*.{test,spec}.{js,ts}']
+	}
+});