feat: implement transaction functionalities

[JericN]

This pull request addresses residual issues from the previous PR, implements transaction functionalities, and rectifies issues with the current stores.

Enhancements

• Firebase Firestore now manages user credentials and transaction data.
• Users can add, edit, and delete transactions.
• Added username functionality during account registration.

Refactoring and Fixes

• Organized files for better codebase structure.
• Finalized types for Transactions and Records.
• Streamlined store implementation.
• migrate to using try-catch pattern

closes #43, #45

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