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Validate handle syntax in the atproto login form before submit master

HandleSearchInput gains an opt-in validateHandle prop: typed values are trimmed, stripped of a leading @, and checked with isValidHandle; invalid ones block submit with a native validation bubble. Suggestion picks skip the check. Enabled on both the log-in and link-account forms. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>


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2 changed files