refactor dashboard feature boundaries and add test setup

vitest.config.ts

@@ -0,0 +1,17 @@
+import react from '@vitejs/plugin-react';
+import {defineConfig} from 'vitest/config';
+
+export default defineConfig({
+    plugins: [react()],
+    test: {
+        environment: 'jsdom',
+        globals: true,
+        setupFiles: ['./vitest.setup.ts'],
+        include: ['features/**/*.test.ts', 'features/**/*.test.tsx', 'components/**/*.test.tsx'],
+    },
+    resolve: {
+        alias: {
+            '@': new URL('.', import.meta.url).pathname,
+        },
+    },
+});