hermes-explorigin 347e9b2a0a Add custom zones & POI layers with user-editable config and example data
- scripts/custom-layers.mjs: hand-authored, self-documenting config for
  custom zones (polygons) and points of interest, shipped with example
  Tulsa POIs and district zones plus a copy-paste template
- osm-data.mjs: merges custom layers into static/data/custom/<id>.geojson
  and includes them in the _index.json manifest with category, layerType,
  and color metadata
- MapView.svelte: renders each manifest entry as an independent toggleable
  Leaflet layer with per-layer styling and an on-map legend panel
- +page.svelte: loads all data sources (OSM + custom) from the manifest
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