feat: two-pane dev controls panel with tree, editor, add-child, and pick-on-map
- Left pane: nested component tree with +/x buttons for add/remove - Right pane: attribute editor with per-input MutationObserver sync - Shared pick-on-map: single click picks both lat/lng from one map click - Add-child wizard replaces editor pane, Cancel restores previous content - Source HTML display for selected element - Missing attributes added: min/max-zoom, zoom-snap/delta, path style attrs, popup/tooltip lat/lng, overlay interactive/loop/autoplay, and moremain
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a8245c0114
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275c74f0c2