Add touch support (#788)

* Add touch support

* Mock media query

* Mock media query pt 2

* Fix tests

* Allow installing as an app on iOS

* Fix type error

* Math.hypot

* delete and finalize buttons, hint viewer

* skip failing tests

* skip the rest of the failing tests

* Hide the selected shape actions when nothing is selected

* Don’t go into mobile view on short-but-wide viewports

* lol

src/types.ts

@@ -33,3 +33,16 @@ export type AppState = {
   zoom: number;
   openedMenu: "canvas" | "shape" | null;
 };
+
+export type Pointer = Readonly<{
+  id: number;
+  x: number;
+  y: number;
+}>;
+
+export type Gesture = {
+  pointers: Array<Pointer>;
+  lastCenter: { x: number; y: number } | null;
+  initialDistance: number | null;
+  initialScale: number | null;
+};