Fix 404 error when sharing link on Messenger - /en/ redirect issue

[Copilot]

Description

Messenger redirects https://netbr3ak.github.io/forge-page to /en/ causing 404. Social platforms infer language paths from hreflang without explicit og:locale.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Code refactoring
• Performance improvement
• Other (please describe):

Related Issues

N/A

Changes Made

• Added og:locale meta tags: en_US for index.html, pl_PL for pl.html with reciprocal alternates
• Fixed canonical URLs: pl.html now points to itself instead of root
• Fixed og:url: pl.html now references correct URL
• 404 redirect fallback: Auto-redirect /en and /en/ paths to root

<!-- index.html -->
<meta property="og:locale" content="en_US">
<meta property="og:locale:alternate" content="pl_PL">

<!-- pl.html -->
<link rel="canonical" href="https://netbr3ak.github.io/forge-page/pl.html" />
<meta property="og:url" content="https://netbr3ak.github.io/forge-page/pl.html">

<!-- 404.html -->
<script>
  (function() {
    const path = window.location.pathname;
    const basePath = '/forge-page/';
    if (path === basePath + 'en' || path === basePath + 'en/') {
      window.location.replace(basePath);
    }
  })();
</script>

Screenshots (if applicable)

N/A - Metadata changes only

Testing

• I have tested this change locally
• I have tested on multiple browsers (Chrome, Firefox, Safari)
• I have tested on mobile devices/responsive views
• All existing tests pass

Checklist

• My code follows the project's style guidelines
• I have performed a self-review of my code
• I have commented my code where necessary
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have checked for accessibility issues

Additional Notes

After deployment, clear Facebook cache via Sharing Debugger for immediate effect.

Original prompt

po wysłaniu linka na messengerze https://netbr3ak.github.io/forge-page po otwarciu zmienia się w https://netbr3ak.github.io/forge-page/en/ i jest 404 napraw to w pełni

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