Store the theme mode and link

[apomalyn]

📖 Description

• Implement PreferencesService to store simple data like the user preferences directly in the device (outside the DB)
• Implement SettingsRepository.themeMode
• Link SettingsViewModel and SettingsRepository to use the newly created themeMode

Please do not forget that the settings page isn't accessible directly from the application for now

⁉️ Related Issues

partial of #30

🖼️ Screenshots:

Demonstration of theme mode persistance

https://github.com/RoadTripMoustache/kana_to_kanji/assets/22211097/c660b33e-03ed-4ce6-a8cf-08f9127c24fe

🧪 How to test the change?

• Update the router to start the application on SettingsView.routeName
• Change the theme mode that pleases you.
• Close the application
• Start it up again
• See changes

☑️ Checklist before requesting a review

• [x] I have performed a self-review of my code.
• [x] I have added/updated tests.
• [ ] ~Make sure to add either one of the following labels: version: Major,version: Minor or version: Patch.~

[github-actions[bot]]

Coverage after merging feat/30_store_theme into feat/30 will be

61.43%

Coverage Report for Changed Files

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
lib/src
locator.dart	7.69%	100%	100%	7.69%	14–17, 19, 23–29
lib/src/core/repositories
settings_repository.dart	92.31%	100%	100%	92.31%	13
lib/src/core/services
preferences_service.dart	72.73%	100%	100%	72.73%	17–19, 22–24, 27–29

[github-actions[bot]]

Coverage after merging feat/30_store_theme into feat/30 will be

62.88%

Coverage Report for Changed Files

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
lib/src
locator.dart	7.69%	100%	100%	7.69%	14–17, 19, 23–29
lib/src/core/repositories
settings_repository.dart	92.31%	100%	100%	92.31%	13
lib/src/core/services
preferences_service.dart	72.73%	100%	100%	72.73%	17–19, 22–24, 27–29
lib/src/settings
settings_view_model.dart	100%	100%	100%	100%