General

• 🎨 Implemented AppColors and AppTextStyles as ThemeExtensions, featuring dynamic theme support.
• ✨ Enhanced playground screens* with new UI elements, including core colors, buttons, texts, and more!

Checklists

• Platform specific changes (input, image picking etc) are tested on both of the platforms (Android and iOS)
• It is tested that the UI changes are rendered correctly on different device sizes (such as long lists or expanded rows) with safe area conditions.
• Edge cases, such as responses being empty or invalid, missing data, no internet connection etc, are tested and the app works as expected.

Showcase

• Either showcase screenshots / videos are attached, or this PR does not require such any showcase.

Playground screen in both themes*