Resolve warning which indicate state changed after widget disposed

[snaoyam]

Changes

• Fix to change state only on mounted
• Optimize performance of responsive buttons
  by using ValueNotifier instead of setState to notify widgets that needs rebuild

Issue

To Reproduce

시간표 검색결과 화면 닫기 버튼을 빠르게 눌렀다 뗄 경우 GestureDetector의 onTapDown 함수의 delayed computation에서 실행되는 setState이 IconTextButton가 disposed 된 후에 실행되면서 Warning 메시지를 띄움

문제코드 (responsive_button.dart:256-258)	Warning 메세지

Fix Procedure

setState를 mounted된 경우에만 실행하는 것으로 해결 c8e53ab

@override
void setState(e) {
  if(mounted) {
    super.setState(e);
  }
}

[codecov]

Codecov Report

Merging #125 (7f3c4d7) into main (bdbc426) will increase coverage by 0.45%.
The diff coverage is 61.57%.

❗ Current head 7f3c4d7 differs from pull request most recent head bb9b014. Consider uploading reports for the commit bb9b014 to get more accurate results

@@            Coverage Diff             @@
##             main     #125      +/-   ##
==========================================
+ Coverage   26.91%   27.36%   +0.45%     
==========================================
  Files          80       80              
  Lines        4708     4707       -1     
==========================================
+ Hits         1267     1288      +21     
+ Misses       3441     3419      -22     

Files Changed	Coverage Δ
lib/home.dart	0.00% <ø> (ø)
lib/pages/course_detail_page.dart	4.71% <ø> (ø)
lib/pages/course_search_page.dart	83.78% <ø> (ø)
lib/pages/lecture_detail_page.dart	4.91% <ø> (ø)
lib/pages/lecture_search_page.dart	82.66% <ø> (ø)
lib/pages/login_page.dart	46.80% <ø> (ø)
lib/pages/main_page.dart	0.00% <ø> (ø)
lib/pages/settings_page.dart	59.74% <ø> (ø)
lib/pages/timetable_page.dart	4.20% <ø> (ø)
lib/pages/user_page.dart	0.00% <0.00%> (ø)
... and 13 more

... and 1 file with indirect coverage changes

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[sboh1214]

String 대신 Enum을 활용하여 코드가 더 견고해 진 것 같습니다 수고하셨어요 :)