feat(web): editorial slow-food redesign across the whole UI

A complete visual + tonal pass on every page. Replaces the previous shadcn
slate+emerald defaults with an Italian editorial aesthetic — refined slow-food
magazine crossed with a luxury cookbook. Mobile-first, premium, distinctly
Italian, no generic AI-wellness vibes.

Tokens:
- New palette: carta (cream parchment), ink (warm black), oliva (deep olive),
  pomodoro (terracotta), oro (aged gold), rule (hairline). All exposed as
  HSL CSS variables and as Tailwind colors. Dark mode = oxblood/cream.
- Type stack: Fraunces (variable, optical-sizing auto, italic + roman) for
  display / Inter Tight for body / JetBrains Mono with tnum + zero for
  numerals. Replaces Inter-only setup.
- Font feature settings on body and .font-display for ligatures, opsz
  and stylistic alternates.
- Subtle SVG paper grain on body::before (multiply blend, 4.5% opacity).
- 2px radius default (editorial print, not soft web).

Component primitives:
- Button — mono uppercase 11px tracking-widest, sharp corners, hover
  inverts ink/cream. Variants tuned for the new palette.
- Input — bottom-only hairline, Fraunces 18px text, italic placeholders.
- Label — tiny mono caps, ink-soft.
- Card — top + bottom hairlines only, no shadow; Fraunces title and italic
  description; CardFooter has its own top-rule.
- Select — same hairline-bottom trigger as Input; SelectContent panel uses
  a hard 6px offset shadow for an editorial print stamp feel.

New component:
- Masthead — top-of-page newspaper header with thick top-rule, KP wordmark
  with terracotta dot, "ANNO I · N. 0X" issue label, today's date in Italian.

Pages:
- / — Massive Fraunces "Una keto italiana, sostenibile." with terracotta
  dot, italic Fraunces tagline, right-column nav with category eyebrows
  (CUCINA / PROFILO) and arrow rule. Bottom: "Tre principi" with roman
  numerals I/II/III. Disclaimer in italic.
- /sign-in — "CAPITOLO II / Bentornato in cucina." split layout.
- /sign-up — "CAPITOLO III / Inizia il tuo percorso." Italian copy refresh.
- /welcome — Editor's-letter layout with the four PRD §14.3 points as a
  Roman-numeral list; custom hand-drawn check icon for the consent boxes.
- /profile — 7/5 split: form on the left (anagrafica + peso group), summary
  on the right with massive mono numerals (BMR, TDEE, multiplier) and italic
  "kcal" units; empty-state copy until the profile is saved.
- /plan — "CAPITOLO V / Il tuo piano." Italian-formatted week range. Each
  day has a Roman-numeral mark (I-VII), Fraunces day name, mono kcal total.
  Each meal slot uses Roman numerals (I-IV) for the meal index.
- Cookie banner — refreshed to match (italic Fraunces, "PRIVACY" eyebrow,
  outline button).

Italian copy refresh:
- Headline: "Una keto italiana, sostenibile" (was "KetoPath")
- Tagline: narrative arc instead of marketing line
- CTAs: "Iscriviti" / "Accedi" (was "Inizia gratis" / "Scopri come funziona")
- Greeting: "Buongiorno, {name}." (was "Accesso effettuato come ...")
- Profile: weight columns become Iniziale / Attuale / Obiettivo under a
  "Peso (chilogrammi)" group eyebrow.

E2E updated to match: home looks for the new headline and CTA labels;
profile uses the new "Come ti chiami" / "Iniziale / Attuale / Obiettivo"
labels and asserts numeric values separately from the "kcal" unit span.

All 4 specs pass. Verified visually at 1280×900 and 375×812.

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

apps/web/src/app/[locale]/welcome/disclaimer-form.tsx

@@ -24,11 +24,11 @@ export function DisclaimerForm() {
   }
 
   return (
-    <form onSubmit={handleSubmit} className="mt-6 space-y-3">
+    <form onSubmit={handleSubmit} className="space-y-5">
       <Checkbox checked={adult} onChange={setAdult} label={t('checkAdult')} />
       <Checkbox checked={aware} onChange={setAware} label={t('checkAware')} />
       <Checkbox checked={accepts} onChange={setAccepts} label={t('checkAccepts')} />
-      <Button type="submit" disabled={!allChecked || pending} className="mt-4 w-full">
+      <Button type="submit" disabled={!allChecked || pending} size="lg" className="mt-2 w-full">
         {pending ? t('submitting') : t('submit')}
       </Button>
     </form>
@@ -45,14 +45,32 @@ function Checkbox({
   label: string;
 }) {
   return (
-    <label className="flex cursor-pointer items-start gap-3 text-sm">
+    <label className="group flex cursor-pointer items-start gap-3">
+      <span
+        className={`relative mt-1 inline-flex h-5 w-5 shrink-0 items-center justify-center border ${
+          checked ? 'border-ink bg-ink' : 'border-ink/40 bg-transparent'
+        } transition-colors`}
+      >
+        {checked ? (
+          <svg viewBox="0 0 20 20" className="text-carta-light h-3.5 w-3.5">
+            <path
+              fill="none"
+              stroke="currentColor"
+              strokeWidth="2"
+              strokeLinecap="square"
+              strokeLinejoin="miter"
+              d="M4 11l4 4 8-9"
+            />
+          </svg>
+        ) : null}
+      </span>
       <input
         type="checkbox"
-        className="border-input text-primary focus-visible:ring-ring mt-0.5 h-4 w-4 rounded border focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-offset-2"
+        className="sr-only"
         checked={checked}
         onChange={(e) => onChange(e.target.checked)}
       />
-      <span>{label}</span>
+      <span className="font-display text-ink text-base leading-snug">{label}</span>
     </label>
   );
 }