fix: preserve locale in LinkButton internal hrefs

[lariciamota]

What's the purpose of this pull request?

When navigating a store in a non-default locale (e.g., store.com/pt-BR), clicking the Sign In button redirected to /login instead of /pt-BR/login. This caused the store to lose the locale context and render in the default language. The same issue affected any LinkButton in core whose href was a hardcoded internal path.

How it works?

A new locale-aware LinkButton wrapper was created at the core, mirroring the existing Link pattern in core.
The wrapper intercepts the href prop and, for any internal path (starting with /), runs it through resolveLink from useLink. This applies the current locale prefix automatically — whether that's a Next.js locale segment (e.g., /pt-BR/login) or a custom path prefix (e.g., /brasil/login) — while leaving external URLs untouched.
Components updated to use the new wrapper:

• ButtonSignIn — /login
• ButtonSignInFallback — /login (Suspense fallback)
• EmptyGallery — button URLs (comes from CMS)

Going forward, any LinkButton in core should import from src/components/ui/LinkButton instead of @faststore/ui, just as Link is imported from src/components/ui/Link.

How to test it?

• Run with localization enabled and test a non-default locale (e.g., en-US as default, pt-BR as secondary)
• Navigate to the store under the secondary locale path (e.g., store.com/pt-BR)
• Click the Sign In button in the navbar
  Before fix: redirected to /login (default locale, page renders in English)
  After fix: redirected to /pt-BR/login (locale preserved)
  Repeat with a store using a custom path prefix (e.g., /brasil) to verify the custom path is also applied

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References

• Jira task

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