Fix mobile touch events (#233)

Ported from #229

---------

Co-authored-by: Johnathon Selstad <makeshifted@gmail.com>

demos/web-editor/web/src/index.html

@@ -26,6 +26,8 @@
         max-height: 512px;
         outline: 1px solid #bbb;
         margin-bottom: 12px;
+        user-select: none;
+        touch-action: none;
       }
       span#status {
         display: block;

demos/web-editor/web/src/index.ts

@@ -76,21 +76,36 @@ class App {
     scene.canvas.addEventListener("contextmenu", (event) => {
       event.preventDefault();
     });
-    scene.canvas.addEventListener("mousedown", (event) => {
-      if (event.button === 0) {
-        scene.beginTranslate(event);
-      } else if (event.button === 2) {
-        scene.beginRotate(event);
-      }
-    });
-    window.addEventListener("mouseup", (event) => {
-      scene.endDrag();
-    });
-    window.addEventListener("mousemove", (event) => {
-      if (scene.drag(event)) {
-        requestRedraw();
-      }
-    });
+    scene.canvas.addEventListener(
+      "pointerdown",
+      (event) => {
+        event.preventDefault();
+        if (event.button === 0) {
+          scene.beginTranslate(event);
+        } else if (event.button === 2) {
+          scene.beginRotate(event);
+        }
+      },
+      { passive: false },
+    );
+    window.addEventListener(
+      "pointerup",
+      (event) => {
+        event.preventDefault();
+        scene.endDrag();
+      },
+      { passive: false },
+    );
+    window.addEventListener(
+      "pointermove",
+      (event) => {
+        event.preventDefault();
+        if (scene.drag(event)) {
+          requestRedraw();
+        }
+      },
+      { passive: false },
+    );
     this.scene = scene;
 
     // Hot-patch the gyroid script to be eval (instead of exec) flavored