fix: Avoid multiple theme checks

[SGI-CAPP-AT2]

Describe your improvement idea or feature request

Currently Across application there are multiple theme checks being done for every widget build.
Like shown below:

taskwarrior-flutter/lib/app/modules/home/views/nav_drawer.dart

Lines 24 to 33 in d1d4ca2

	backgroundColor: AppSettings.isDarkMode
	? TaskWarriorColors.kprimaryBackgroundColor
	: TaskWarriorColors.kLightPrimaryBackgroundColor,
	surfaceTintColor: AppSettings.isDarkMode
	? TaskWarriorColors.kprimaryBackgroundColor
	: TaskWarriorColors.kLightPrimaryBackgroundColor,
	child: Container(
	color: AppSettings.isDarkMode
	? TaskWarriorColors.kprimaryBackgroundColor
	: TaskWarriorColors.kLightPrimaryBackgroundColor,

How would you like to see it implemented?

1. Currently Global ThemeData are empty in utils/themes so populate them with existing values being used
2. Refactor the code where checks are made if it's not causing any issue
3. Change the theme with Get.changeTheme

Put here any screenshots or videos (optional)

No response

How can we contact you (optional)

@SGI-CAPP-AT2

Would you like to work on this issue?

Yes

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[SGI-CAPP-AT2]

@BrawlerXull please review this issue and assign me if it's appropriate to make changes

[BrawlerXull]

Hey the issues are open to be solved by everyone it will be merged on first come first serve basis
First good pr will be merged