- GEMINI_MODEL for AI commands: gemini-2.0-flash-exp → gemini-3-flash-preview
- Language/Country: handle plain 2-letter codes (EN→Language, UK→Country)
and "EN-UK" split format; previously only split format worked
- Handsontable black screen: add min-h-0 on flex-1 container so height:100%
resolves correctly inside the flexbox chain
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>