feat(i18n): add language selector with EN/ES toggle and localStorage …

[Ayilojay]

Summary

Adds a language selector to the Profile page that lets users switch between
Spanish and English. The selection is applied immediately and persisted across
refreshes and new sessions via localStorage.

Changes

• src/i18n/locales/en.ts — Full English locale mirroring the existing es.ts
  structure (all namespaces: common, nav, login, onboarding, home, credit,
  deposit, activity, history, profile, withdrawals, notifications, help,
  nft_modal)
• src/i18n/config.ts — Registers en resource; reads vinculo_language from
  localStorage on init to restore the saved preference
• src/i18n/useLanguage.ts — changeLanguage() now writes to localStorage before
  delegating to i18next
• src/components/LanguageSelector.tsx — Minimal ES / EN pill toggle,
  mobile-friendly, highlights the active language
• src/pages/Perfil.tsx — Mounts LanguageSelector in a card above the settings
  menu

How to test

1. Open the app and go to Profile.
2. Tap English — all translated strings switch immediately.
3. Refresh the page — English is still active.
4. Tap Español — switches back; refresh confirms persistence.
5. Repeat on a mobile viewport.

Acceptance criteria

• User can switch language in UI
• Selection persists across refresh and new session

close #8

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