fix: switch server portal map tiles to CARTO (OSM was rate-limiting/blocking)

OSM tile.openstreetmap.org was returning grey tiles on the portal (likely
rate-limiting the Cloudflare tunnel egress IP). Switch to CARTO Voyager
tiles which are free, CDN-backed, and don't have the same restrictions.

Also add data-tile-subdomains attribute support in history.js so tile
provider subdomains can be configured per-deployment.

Co-authored-by: Copilot <[email protected]>

server/templates/history.html

@@ -55,8 +55,8 @@
             </div>
             <div class="card-body p-0">
                 <div id="history-map" aria-label="Selected trip route map"
-                     data-tile-url="https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png"
-                     data-tile-attrib="&copy; <a href='https://www.openstreetmap.org/copyright'>OpenStreetMap</a> contributors"
+                     data-tile-url="https://{s}.basemaps.cartocdn.com/rastertiles/voyager/{z}/{x}/{y}.png"
+                     data-tile-attrib="&copy; <a href='https://www.openstreetmap.org/copyright'>OpenStreetMap</a> contributors &copy; <a href='https://carto.com/attributions'>CARTO</a>"
                      data-min-zoom="3" data-max-zoom="19"></div>
                 <div id="trip-timeline" class="border-top p-3" hidden>
                     <div class="d-flex align-items-center gap-3">

static/js/history.js

@@ -13,12 +13,14 @@
     const mapEl = document.getElementById("history-map");
     const tileUrl = mapEl.dataset.tileUrl || "/static/vendor/tiles/{z}/{x}/{y}.png";
     const tileAttrib = mapEl.dataset.tileAttrib || "© MapTiler © OpenStreetMap contributors";
+    const tileSubdomains = mapEl.dataset.tileSubdomains || "abc";
     const minZoom = parseInt(mapEl.dataset.minZoom, 10) || 3;
     const maxZoom = parseInt(mapEl.dataset.maxZoom, 10) || 19;
     const map = L.map("history-map", { minZoom: minZoom, maxZoom: maxZoom }).setView([48.505, -0.09], 12);
     const tiles = L.tileLayer(tileUrl, {
         minZoom: minZoom,
         maxZoom: maxZoom,
+        subdomains: tileSubdomains,
         attribution: tileAttrib,
     }).addTo(map);
     let routeLayer = null;