Add a search box, matching NPS's Park Tiles viewer

Top-left map control (topmost, above Home/zoom) with a text input:
"lat, lng" is parsed and jumped to directly (same plain-text shape the
topbar's coordinate readout already copies to the clipboard), anything
else is geocoded via Nominatim — OSM's own geocoder, free, no API key,
matching the online basemap's own OSM-derived style. Online only, same
story as this app's other non-basemap online features (Radar, the
Wikipedia layer) — no offline geocoding index to fall back to.

public/js/map.js

@@ -14,6 +14,7 @@ import { MeasureControl } from "/js/measure.js";
 import { NotesControl } from "/js/notes.js";
 import { PluginsControl } from "/js/plugins.js";
 import { LocateControl } from "/js/locate.js";
+import { SearchControl } from "/js/search.js";
 import { LAYERS_ICON, WAYPOINT_ICON, SUNRISE_ICON, SUNSET_ICON, PENDING_ICON } from "/js/icons.js";
 import { formatCoords, formatSunInfo } from "/js/sun.js";
 import { notifySidePanelOpen, onlyOneSidePanelOpen } from "/js/panels.js";
@@ -405,6 +406,7 @@ const SLOVAKIA_BOUNDS = [
   [16.83, 47.73],
   [22.57, 49.61],
 ];
+map.addControl(new SearchControl(), "top-left");
 map.addControl(new HomeButton({ bounds: SLOVAKIA_BOUNDS }), "top-left");
 // showCompass: false — this map never rotates, so a bearing-reset button
 // (NavigationControl's default third button) would just be dead weight.