eslint: enable react-hooks checks

Also fix all errors, which can lead to subtile bugs.

Mostly fixings deps and refactoring to make typescript happy.

src/activities/hooks.ts

@@ -39,7 +39,7 @@ export function useActivitiesSelectedActivity(): ReturnType<
 
     useEffect(() => {
         setLastSelectedActivity(selectedActivity);
-    }, [selectedActivity]);
+    }, [selectedActivity, setLastSelectedActivity]);
 
     return [selectedActivity, setSelectedActivity];
 }