Increase touch-first globe zoom sensitivity

docs/CURRENT-STATE.md

@@ -1,5 +1,10 @@
 # God's Eye View Current State
 
+Touch-first devices use three times the default Cesium zoom sensitivity, so
+pinching traverses globe and street scales with fewer gestures. Cesium retains
+its distance-aware zoom, collision handling and minimum/maximum distance limits.
+Fine-pointer desktop mouse and trackpad sensitivity is unchanged.
+
 Analyst region queries resolve unique Natural Earth names offline without
 geocoding, so Gold Coast and Ivory Coast name the West African natural regions.
 Duplicate names require a geocoded containment anchor; when several entries for

src/app/viewer.js

@@ -137,6 +137,11 @@ export function createApplicationViewer({ container, creditContainer }) {
   );
   try {
     viewer.targetFrameRate = 60;
+    // A phone pinch spans fewer screen pixels than desktop zoom gestures.
+    // Keep Cesium's distance-aware zoom and collision limits, with less travel
+    // required on touch-first screens. Mouse/trackpad sensitivity stays native.
+    if (globalThis.matchMedia?.('(pointer: coarse)').matches)
+      viewer.scene.screenSpaceCameraController.zoomFactor *= 3;
     // Before any tile builds a draw command: Cesium's per-vertex model
     // atmosphere fails to LINK on Apple's Metal backend and kills the
     // render loop. See app/atmosphereCompat.js.