refactor: budgets and recurring transactions

[lucaantonelli]

🎯 Description

Improve use of riverpod for budgets.
Recurring transactions now shows real data on old payments instead of precalculated.

📱 Changes

• Move some functions logic into budgets provider instead of the widget page
• Create a separate file for recurring transactions provider
• Remove recurring transaction calculator (fake data), and implemented a query to get real historical transactions data for recurrence

🔍 Checklist for reviewers

• Code is formatted correctly
• Tests are passing
• New tests are added (if needed)
• Style matches the figma/designer requests
• Tested on:
  • iOS
  • Android

[theperu]

LGTM! 👍🏻