Calendar and Tags Refinement

A handful of refinements building on V6. Also some backend improvements for AI response quality and UI refinements to key interaction areas.

• AI Backend: Infrastructure updates for faster prompt refinements and quality improvements

• UI Enhancements: Spacious bottom sheets for calendar and tags, improved date selection

• Design Updates: Refined pincode page and lookback section

• Fixes: Corrected desktop button hover states and minor stability improvements