fix(tests): update failing test_get_available_budget

[RadCod3]

This PR enables the disabled test case that was failing before due to a bug in Firefly III API.
Resolves #43

[coderabbitai]

📝 Walkthrough

Summary by CodeRabbit

• Bug Fixes

  • Updated get_available_budget API to use start_date and end_date parameters instead of start and end for improved naming consistency.

• Tests

  • Activated and updated integration tests for the available budget functionality with proper response validation.

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Walkthrough

The test for get_available_budget was updated to become active by removing the xfail marker. The test now uses corrected API parameters (start_date and end_date) and parses the response using the AvailableBudget model instead of raw data access, with assertions updated to reference model attributes.

Changes

Cohort / File(s)	Summary
Test Updates tests/integration/test_budgets.py	Removed xfail marker from test_get_available_budget; updated API payload parameters from start/end to start_date/end_date; changed response parsing from result.data to AvailableBudget.model_validate(result.structured_content); updated assertions to access model attributes (amount, currency_code, start_date, end_date) with isoformat representations

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

🐰 A budget test hops into the light,
No more xfails clouding the sight,
With dates renamed and models aligned,
The API's response, perfectly signed,
Firefly's currencies now understood right! 💰✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The PR title clearly describes the main change: fixing and updating a failing test for get_available_budget, which aligns with the changeset.
Description check	✅ Passed	The description is related to the changeset - it mentions enabling a disabled test case and references issue #43, which matches the PR's purpose.
Linked Issues check	✅ Passed	The PR updates the test to use correct API field names (start_date/end_date) and proper model validation, directly addressing issue #43's requirement to fix validation errors.
Out of Scope Changes check	✅ Passed	All changes are within scope - the modifications to test_budgets.py are directly related to fixing the test case and resolving issue #43.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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✨ Finishing touches

• 📝 Generate docstrings

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.81%. Comparing base (72161b2) to head (86b321f).
⚠️ Report is 2 commits behind head on main.
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Additional details and impacted files

@@           Coverage Diff           @@
##             main      #63   +/-   ##
=======================================
  Coverage   99.81%   99.81%           
=======================================
  Files          15       15           
  Lines        2661     2661           
=======================================
  Hits         2656     2656           
  Misses          5        5           

Flag	Coverage Δ
integration	99.81% <ø> (ø)

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