Only warn before unload if is dirty

src/features/activityData/ExitWarning.ts

 import { FC, useEffect } from "react";
 import { useCanSave } from "./hooks";
+import { useAppSelector } from "../../app/hooks";
+import { selectIsDirty } from "./activityDataSlice";
 
 const ExitWarning: FC = () => {
   const canSave = useCanSave();
+  const isDirty = useAppSelector(selectIsDirty);
 
   useEffect(() => {
     const handleBeforeUnload = (e: BeforeUnloadEvent) => {
-      if (canSave) {
+      if (canSave && isDirty) {
         e.preventDefault();
         e.returnValue = true;
       }