chore: add more tests for the expense api

[ltabis]

No description provided.

[Copilot]

Pull request overview

This PR adds comprehensive test coverage for the expense API by introducing a dedicated test helper function and three new test cases for different time periods (monthly, trimestrial, yearly). Additionally, it improves code documentation by adding explanatory comments to struct fields and reorders struct fields to place numeric totals first for better readability.

• Refactored test setup by extracting a new setup_expenses() helper function that creates a complete test environment with budget, allocations, and transactions
• Added three new test cases (test_get_expenses_monthly, test_get_expenses_trimestrial, test_get_expenses_yearly) to verify expense calculations across different time periods
• Enhanced struct documentation by adding comments explaining the purpose of transactions_total and allocations_total fields in ExpensesAllocation, ExpensesPartition, and ExpensesBudget structs

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
desktop/src-tauri/tests/budget.rs	Refactored existing tests by moving them after a new setup_expenses() helper function; added three new test functions to verify expense calculations for monthly, trimestrial, and yearly periods
cli/src/budget/expenses.rs	Added documentation comments to struct fields and reordered fields in ExpensesPartition and ExpensesBudget to place numeric totals first
cli/bindings/ExpensesPartition.ts	Updated TypeScript binding to reflect the reordered struct fields from the Rust code
cli/bindings/ExpensesBudget.ts	Updated TypeScript binding to reflect the reordered struct fields from the Rust code

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