Initial

vitest.config.ts

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+import { defineConfig } from 'vitest/config';
+import { fileURLToPath } from 'node:url';
+
+const r = (p: string) => fileURLToPath(new URL(p, import.meta.url));
+
+// Unit tests target the pure layers (domain/state/api/auth). We resolve the
+// project's `$` aliases here directly rather than pulling in the full SvelteKit
+// Vite plugin — `$app/*` runtime imports are mocked per-test with vi.mock().
+export default defineConfig({
+	test: {
+		environment: 'happy-dom',
+		globals: true,
+		include: ['tests/unit/**/*.test.ts']
+	},
+	resolve: {
+		alias: {
+			$domain: r('./src/lib/domain'),
+			$state: r('./src/lib/state'),
+			$api: r('./src/lib/api'),
+			$auth: r('./src/lib/auth'),
+			$map: r('./src/lib/map'),
+			$ui: r('./src/lib/ui'),
+			$i18n: r('./src/lib/i18n'),
+			$features: r('./src/lib/features'),
+			'$app/navigation': r('./tests/stubs/app-navigation.ts')
+		}
+	}
+});