feat(web): refactor profile to shadcn Form + Select primitives

- Add shadcn Form helpers (Form, FormField, FormItem, FormLabel, FormControl,
  FormMessage, FormDescription) on top of react-hook-form's Controller
- Add shadcn Select wrapping @radix-ui/react-select with Trigger / Content /
  Item / Value, lucide chevron + check icons
- Profile form now wraps fields in <Form>...<FormField> blocks; gender and
  activityLevel use the new Select with placeholder, the rest use Input;
  validation errors land in <FormMessage> per field automatically

Playwright config:
- webServer is now an array — Playwright boots both api (:4000) and web (:3000)
  before the suite, so server actions that proxy to API_URL work in CI/local
- profile.spec.ts updated for the new flow: post-signup goes through /welcome
  to accept the medical disclaimer, then through Select primitives via
  combobox click + role=option for Sesso and Livello di attività

Verified: pnpm test:e2e — 4/4 specs pass (home + 2 auth + profile).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/web/e2e/profile.spec.ts

@@ -19,18 +19,27 @@ test('profile flow — submit returns BMR/TDEE for the Michele PRD persona', asy
   await page.getByRole('button', { name: 'Crea account' }).click();
   await page.waitForURL('/');
 
-  // Open the profile page from the home CTA
+  // Open profile from home — first time we'll be redirected through /welcome
   await page.getByRole('link', { name: 'Completa il tuo profilo' }).click();
+  await page.waitForURL('/welcome');
+
+  // Accept the medical disclaimer (3 mandatory checkboxes + submit)
+  await page.getByLabel(/Confermo di essere maggiorenne/).check();
+  await page.getByLabel(/Dichiaro di non avere condizioni mediche escludenti/).check();
+  await page.getByLabel(/Accetto che KetoPath non sostituisce/).check();
+  await page.getByRole('button', { name: 'Accetto e proseguo' }).click();
   await page.waitForURL('/profile');
 
   // Fill the form with the "Michele" PRD persona values
   await page.getByLabel('Età').fill('49');
-  await page.getByLabel('Sesso').selectOption('MALE');
+  await page.getByLabel('Sesso').click();
+  await page.getByRole('option', { name: 'Maschio' }).click();
   await page.getByLabel('Altezza (cm)').fill('170');
   await page.getByLabel('Peso iniziale (kg)').fill('76');
   await page.getByLabel('Peso attuale (kg)').fill('76');
   await page.getByLabel('Peso obiettivo (kg)').fill('70');
-  await page.getByLabel('Livello di attività').selectOption('SEDENTARY');
+  await page.getByLabel('Livello di attività').click();
+  await page.getByRole('option', { name: /Sedentario/ }).click();
   await page.getByRole('button', { name: 'Salva profilo' }).click();
 
   // BMR/TDEE summary panel becomes visible after a successful save