- Add IconSection panel shown when a path node with iconId is selected
- Add IconPickerDialog: anchored popover with collection browsing, search,
current icon highlight, and outside-click/Escape to close
- Add iconId field to PathNode to track Iconify icon identity
- Fix canvas path sync to update d in-place (no object recreation/focus loss)
- Fix multi-element SVG icons: convert circles, rects, lines to path commands
so shapes like emoji face circles are not dropped during icon replacement
- Filter invisible bounding-box paths (Tabler's M0 0h24v24H0z) before merging
- Preserve original node width/height on icon replace; carry over display color
- Populate iconId in AI icon resolver and server-side Iconify proxy
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