Add governed DHMV terrain analysis

frontend/src/lib/terrainSelection.ts

@@ -0,0 +1,23 @@
+import type { TerrainSelectionResponse, VectorSelectionResponse } from '../types'
+
+export function terrainSelectionToMapSelection(result: TerrainSelectionResponse): VectorSelectionResponse {
+  return {
+    selection_bbox: result.selection_bbox,
+    selection_area_id: result.selection_area_id,
+    feature_count: 0,
+    total_feature_count: 0,
+    limit: 0,
+    truncated: false,
+    geojson: { type: 'FeatureCollection', features: [] },
+    summary: {
+      ...result.summary,
+      feature_count: result.sample_count,
+      is_estimate: false,
+      warning: result.limitation_message,
+      metrics: result.summary.metrics.map((metric) => ({
+        ...metric,
+        is_estimate: false,
+      })),
+    },
+  }
+}