Improve timer notification screen

[AhsanSarwar45]

Closes #56

[codecov-commenter]

Codecov Report

Attention: 229 lines in your changes are missing coverage. Please review.

Comparison is base (c8dda74) 31.42% compared to head (a133523) 31.27%.

Files	Patch %	Lines
lib/timer/screens/timer_notification_screen.dart	0.00%	27 Missing ⚠️
lib/alarm/types/alarm.dart	5.55%	17 Missing ⚠️
lib/timer/types/timer.dart	0.00%	17 Missing ⚠️
lib/stopwatch/types/stopwatch.dart	0.00%	12 Missing ⚠️
lib/timer/widgets/timer_preset_card.dart	0.00%	12 Missing ⚠️
...ib/alarm/types/schedules/dates_alarm_schedule.dart	0.00%	10 Missing ⚠️
lib/timer/widgets/timer_picker.dart	0.00%	10 Missing ⚠️
lib/alarm/logic/alarm_controls.dart	0.00%	9 Missing ⚠️
lib/clock/types/city.dart	0.00%	9 Missing ⚠️
...lds/select_field/field_cards/audio_field_card.dart	0.00%	9 Missing ⚠️
... and 27 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #60      +/-   ##
==========================================
- Coverage   31.42%   31.27%   -0.15%     
==========================================
  Files         212      212              
  Lines        7966     8058      +92     
==========================================
+ Hits         2503     2520      +17     
- Misses       5463     5538      +75     

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