Replace confusing dual-mode AddItemSheet with streamlined QuickAddItemSheet:
- Single flow with optional location (vs Search/Custom toggle)
- Card-based layout with shadows, borders, and theme colors
- Enhanced CategoryPicker with emoji circles and press animations
- Separate PlaceSearchSheet for focused location search
- Improved header button with capsule style and accessibility labels
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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