Replace duplicated inline SVGs across 16 templates with reusable Askama
macros from a new icons.html partial, reducing repetition and making
icon updates a single-point change.
- Create bag_card.html macro used by both home page and bags page
- Replace divergent card styles with consistent amber-themed design
- Add closeBag() JS to bags page for closing bags with confirmation
- Use "Close" button with cross icon consistently across both pages
