Update, refactor code

Add settings icon and update app subtitle; refactor padding in various views for improved layout consistency

refactor user service methods for better readability and maintainability

Add launcher icons and color resources; update pubspec.yaml for new dependencies

Remove unnecessary padding in PostView for Account and Profile screens; streamline layout for improved consistency.

Refactor padding in media and post views for consistent layout; remove unnecessary padding in HomeScreen.

Enhance error handling and user feedback; update chat UI components and configuration options for improved functionality.

Enhance chat functionality by enabling system UI mode and updating text message display to selectable text; remove unused reaction handling code and clean up copyright comments in multiple files.

Refactor color opacity usage to use withValues method for consistency across the application.

Remove AppLinksHandler and associated apple-app-site-association file to streamline app link handling.

Merge pull request #14 from Tuanpluss02/add-readme

Add professional README.md

Renames 'Gemini' to 'Prompter Assistant' in app_enums.dart for clarity

Refactors systemInstruction in GeminiRepository for clarity and detail; simplifies AuthService factory method; adds updateUser method in UserService; comments out AppBackButton in LoginScreen.

Implements Google sign-in functionality in RegisterController and updates UI interaction; refactors animated rotation disposal logic and adjusts pubspec.yaml dependencies.