feat: add mui time picker for timer input field in timer dialog

[dostulataa]

use time picker for timer input (allows faster input of time

Issue: #201

[NearW]

This state is always changed together, therefore it should be combined.

Suggested change

	const [minutes, setMinutes] = useState(remainingMinutes);
	const [seconds, setSeconds] = useState(remainingSeconds);
	const [time, setTime] = useState<{minutes, seconds}>({minutes: remainingMinutes, seconds: remainingSeconds});

[NearW]

Codewise everything is fine to me, but I actually prefer the old time picker more than the new one. I felt it more intuitive to work with the old one. Maybe we can collect some feedback from more users here?