Updated dependencies and reduced repeated code

[D-extremity]

closes #400

1. Refactor: Centralize theme logic using ThemeData to remove redundant checks
2. Fix: Replace multiple theme checks with global ThemeData implementation
3. Updated notification dependency to the newest which is possible without changing any implementation

Checklist

• Tests have been added or updated to cover the changes
• Documentation has been updated to reflect the changes
• Code follows the established coding style guidelines
• All tests are passing

[BrawlerXull]

Please refactor the whole codebase where ever the old logic is used.
Also avoid pushing files like macos/Flutter/GeneratedPluginRegistrant.swift or updating dependancies in the same pr

[D-extremity]

Please refactor the whole codebase where ever the old logic is used. Also avoid pushing files like macos/Flutter/GeneratedPluginRegistrant.swift or updating dependancies in the same pr

okay i will make a separate PR, change in macos/Flutter/GeneratedPluginRegistrant.swift was of dependency that's why its changed and it came in PR.
Thanks for reviewing, i will PR soon