- Add server-side form handling for yeast swapping without JavaScript
- Implement toggle-based URL parameter system (y0=1, y1=1) for clean URLs
- Add server action to toggle yeast flags and preserve all URL state
- Update multiplier forms to preserve yeast toggle states across submissions
- Calculate yeast conversions server-side from original recipe data
- Fix {{multiplier}} placeholder replacement to handle non-numeric amounts
- Enable multiple independent yeast swappers with full state preservation
- Maintain perfect progressive enhancement: works with and without JS
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Co-Authored-By: Claude <noreply@anthropic.com>
Alexander Bocken
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