feat(i18n): Unicode-aware hashtags + mentions (all scripts, not just ASCII)
The hashtag and @mention regexes were [A-Za-z0-9_] only, so Japanese/Cyrillic/Arabic/etc.
hashtags and handles weren't detected, linked or federated. Now \p{L}\p{M}\p{N} with the u flag
— UTF-8 content works across all languages. IDN domains left as-is (Node URL/fetch do punycode).
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