Add Overture land features to Landuse layer; narrow Earth filter to subtype=land

Implement the following plan: Add Overture `land` Features to Landuse Layer.
We should narrow what gets through the earth filter, it really should just be
land vs. water over there, not types of land.

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

Author: migurski

tiles/src/main/java/com/protomaps/basemap/layers/Earth.java

@@ -78,8 +78,9 @@ public void processOsm(SourceFeature sf, FeatureCollector features) {
   public void processOverture(SourceFeature sf, FeatureCollector features) {
     String type = sf.getString("type");
 
-    // Filter by type field - Overture base theme land
-    if (!"land".equals(type)) {
+    // Filter by type field - Overture base theme land, subtype land only
+    // Other subtypes (forest, grass, shrub, wetland, rock, sand, ice) go to Landuse
+    if (!"land".equals(type) || !"land".equals(sf.getString("subtype"))) {
       return;
     }
 

tiles/src/main/java/com/protomaps/basemap/layers/Landuse.java

@@ -262,6 +262,28 @@ public void processOverture(SourceFeature sf, FeatureCollector features) {
       return;
     }
 
+    if ("land".equals(sf.getString("type"))) {
+      String landClass = sf.getString("class");
+      String kind = switch (landClass) {
+        case "wood", "forest" -> "wood";
+        case "grassland", "grass", "meadow", "fell" -> "grassland";
+        case "scrub", "heath", "shrub", "shrubbery" -> "scrub";
+        case "wetland" -> "wetland";
+        case "bare_rock", "scree", "stone", "rock", "shingle" -> "bare_rock";
+        case "beach" -> "beach";
+        case "sand" -> "sand";
+        default -> null;
+      };
+      if (kind != null && sf.canBePolygon()) {
+        features.polygon(LAYER_NAME)
+          .setAttr("kind", kind)
+          .setAttr("sort_rank", 189)
+          .setZoomRange(7, 15)
+          .setMinPixelSize(2.0);
+      }
+      return;
+    }
+
     if (/* !"land_cover".equals(sf.getString("type")) && */ !"land_use".equals(sf.getString("type"))) {
       return;
     }