- Strip leaflet-icon.ts to image-only (new Icon(), remove div/html/bgPos)
- Create leaflet-div-icon.ts with DivIcon, innerHTML content, MutationObserver
- Convert marker↔icon from querySelector to event-only protocol:
marker iterates children dispatching leaflet-request-icon on each,
icons listen on themselves and respond with icon-changed
- Extract emitIconChanged() helper into register.ts to eliminate
repeated CustomEvent construction across both icon components
- Type icon-changed and leaflet-request-icon in HTMLElementEventMap
- Update marker's #onIconChanged to use typed event instead of cast
- Export LeafletDivIcon from index.ts
- Add DivIcon demo markers to custom-icon.html and index.html
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