v0.5.1-alpha

This pull request includes a version bump for the application and refactors the achievement unlocking logic to ensure asynchronous operations are handled correctly. Below is a summary of the most important changes:

Version Updates:

• Updated the version in package.json from 0.5.0 to 0.5.1.
• Updated the version in src-tauri/tauri.conf.json from 0.5.0 to 0.5.1.

Achievement Unlocking Logic Refactor:

• Refactored the class Achievements in src/js/options.js:
  • Replaced direct property assignment with a call to the unlock method to handle achievement unlocking asynchronously.
  • Made the _sendNotification call in the unlock method asynchronous to ensure notifications are sent properly.