Maps · Layers: routes, GeoJSON, heat and clusters

MapView takes layers over its tiles and under its pins. RouteLine runs
along places the short way across the date line. read_geojson reads RFC
7946 to features, strictly: a position past the globe, a line of one
position or a ring that does not close fails with its reason, and a
feature placed nowhere keeps no geometry. GeoJsonLayer washes areas as
one path per polygon, so holes stay open, outlines them, strokes lines
and dots points. GeoHeatmap spreads weighted places in a quartic kernel
over small cells, scaled to the densest spot in view. Lines and areas
unwrap across the date line and repeat on every world in view.
cluster_markers gathers pins by squares of the world, so a pan keeps
each group; a cluster shows its count, and its press shows its members
whole, never farther out. A zoom that may regroup them hands a focused
pin's or cluster's focus to the map.

examples/gallery/pages/dashboard/monitor.rs

@@ -214,8 +214,8 @@ pub fn stream(_: &mut Window, cx: &mut App) -> impl IntoElement + use<> {
         ),
     ];
     section(
-        "EventStream · LogStream → terminal::LogViewer · TraceWaterfall → debug::TimelineProfiler · SystemMonitor → devtools::ResourceMonitor · ProcessTable → terminal::ProcessList · NetworkGraph (throughput) → charts::RealtimeChart · MapView / GeoHeatmap → maps (T41) · WorldMap → maps (T41)",
-        "Events as they come, newest first, kept by kind, with Pause to hold the list while new ones count up. Logs, traces, a machine's readings, its processes and live throughput have their homes in the terminal, agent, dev tools and charts chapters; the maps come with the maps chapter.",
+        "EventStream · LogStream → terminal::LogViewer · TraceWaterfall → debug::TimelineProfiler · SystemMonitor → devtools::ResourceMonitor · ProcessTable → terminal::ProcessList · NetworkGraph (throughput) → charts::RealtimeChart · MapView / GeoHeatmap → maps::MapView, maps::GeoHeatmap · WorldMap → maps (T41c)",
+        "Events as they come, newest first, kept by kind, with Pause to hold the list while new ones count up. Logs, traces, a machine's readings, its processes and live throughput have their homes in the terminal, agent, dev tools and charts chapters; the maps live in the maps chapter.",
         cx,
     )
     .child(div().w(px(620.)).child(EventStream::new("dashboard-events", events, now())))