Refactor code and new architecture

[sameerasw]

This pull request primarily adds standardized file headers to many core source files across the project. These headers include copyright, license, feature module, file name, and a brief description for each file. Additionally, there are minor documentation improvements and import path corrections.

The most important changes are:

File Header Standardization:

• Added standardized copyright, license, feature module, file name, and description headers to all major source files, including EssentialsApp.kt, MainActivity.kt, all files in appfunctions, data/repository, domain, and controller files. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]

Documentation Improvements:

• Improved and clarified KDoc comments for methods, including parameter and return type annotations, such as in UpdateRepository.kt and StatusBarIcon.kt. [1] [2] [3]

Code Organization:

• Updated import paths for bottom sheet components in MainActivity.kt to reflect their new location in ui.core.sheets, improving code organization and maintainability.