Greg 7273b76c52 fix: correct day-of-week mapping and show date preview errors
- Fix select values to match JS Date.getDay() (0=Sunday) so Thursday
  correctly generates Thursdays instead of Wednesdays
- Move dates-msg outside hidden preview-box so validation errors are visible

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-03-08 13:58:14 +01:00
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