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Add client-side validation to ensure a repository is selected before form submission. Split owner/repo on both change and submit events. Show inline error messages via form-error div. Update CreateIssue handler to return HTMX-friendly HTML error fragments on 400/500. Closes leeworks-agents/gitea-mobile#30 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>