Added back ctrl+r as rotate if on desktop (#5982) (#5993)

Fix #5982

Behaviour of ctrl+r altered to support rotate on desktop, while the web
version continue to use refresh as default.

frontend/src/desktop/hooks/useViewerKeyCommand.ts

@@ -0,0 +1,20 @@
+import { useViewer } from "@app/contexts/ViewerContext"
+import { useCallback } from "react";
+
+export function useViewerKeyCommand(): (event: KeyboardEvent) => boolean {
+  const { rotationActions } = useViewer();
+  return useCallback((event:KeyboardEvent): boolean => {
+     switch (event.key) {
+        case 'r':
+        case 'R':
+            event.preventDefault();
+            if (event.shiftKey) {
+              rotationActions.rotateBackward();
+            } else {
+              rotationActions.rotateForward();
+            }
+          return true;
+      }
+      return false;
+  }, [rotationActions]);
+}