Redesign map page and add lat/lon/needs_commons URL parameters

- Redesign pin_detail.html to match detail page style: place name heading,
  result card, button group, collapsible API response, element cards with
  left-border highlight, collapsible SPARQL query
- Redesign map.html: compact header, styled prompt, shared CSS for element
  cards and tag keys, loading state on XHR
- Add lat/lon URL params to /map: map centres on coords and auto-loads pin
- Add needs_commons checkbox to map page: toggles needs_commons=false in URL
  and re-fetches the current pin when changed
- Return geojson in /pin/ JSON response so map can render the polygon layer
- Pass needs_commons through to /pin/ route and detail page link

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lookup.py

@@ -2,6 +2,7 @@
 """Reverse geocode: convert lat/lon to Wikidata item & Wikimedia Commons category."""
 
 import inspect
+import json
 import random
 import re
 import socket
@@ -535,7 +536,8 @@ def reports() -> str:
 @app.route("/pin/<lat>/<lon>")
 def pin_detail(lat: str, lon: str) -> Response:
     """Details for map pin location."""
-    reply = lat_lon_to_wikidata(float(lat), float(lon))
+    needs_commons = request.args.get("needs_commons", "true").lower() != "false"
+    reply = lat_lon_to_wikidata(float(lat), float(lon), needs_commons)
     element = reply["result"].pop("element", None)
     geojson = reply["result"].pop("geojson", None)
 
@@ -548,18 +550,22 @@ def pin_detail(lat: str, lon: str) -> Response:
         str=str,
         element_id=element,
         geojson=geojson,
+        needs_commons=needs_commons,
         css=css,
         **reply,
     )
 
-    return jsonify(html=html)
+    geojson_data = json.loads(geojson) if geojson else None
+    return jsonify(html=html, geojson=geojson_data)
 
 
 @app.route("/map")
 def map_page() -> str:
     """Map page."""
     css = HtmlFormatter().get_style_defs(".highlight")
-    return render_template("map.html", css=css)
+    lat = request.args.get("lat", type=float)
+    lon = request.args.get("lon", type=float)
+    return render_template("map.html", css=css, init_lat=lat, init_lon=lon)
 
 
 if __name__ == "__main__":