FEAT: Cookie consent banner (GDPR / ePrivacy gate)

[Arnimag]

User Story

In order to make an informed choice about how my data is used
As a first-time visitor to the store from the EU
I want to see a clear cookie consent banner that lets me accept, reject, or customise cookie categories before any non-essential scripts are loaded

Acceptance Criteria

• 1. On my first visit, a cookie consent banner appears before any non-essential cookies are set.
• 2. The banner clearly explains that the site uses cookies and provides options to accept all, reject all, or customise preferences.
• 3. Accepting all cookies saves my preference and dismisses the banner for future visits.
• 4. Rejecting all cookies dismisses the banner and prevents non-essential cookies from being set.
• 5. If I customise preferences, I can toggle individual cookie categories (e.g. analytics, marketing) on or off and save my choice.
• 6. My consent choice persists across sessions — I am not shown the banner again until my preference expires or I reset it.
• 7. I can review and change my cookie preferences at any time (e.g. via a link in the footer).
• 8. The banner copy is shown in the active language.
• 9. The banner is the first focusable element when it appears — focus moves into it.
• 10. All buttons and toggles in the banner are keyboard-operable.
• 11. All banner copy, button labels, and category descriptions translated.

Background & Resources

Details: Consent preferences stored in a cookie or localStorage. Banner shown only if no consent cookie exists. Non-essential scripts (analytics, marketing tags) gated on consent state (see cookie-consent/analytics-gate). Consent expiry follows legal requirements (typically 12 months in the EU).

Key files:

• apps/presentation/features/cookie-consent/cookie-banner.tsx — banner UI component
• apps/presentation/features/cookie-consent/use-consent.ts — consent state management hook
• apps/presentation/app/[locale]/layout.tsx — mounts <CookieBanner>
  Links/Screenshots: (Drag and drop images or paste links here)