feat: refresh token mechanism

[Lzyct]

What it does

• Adds unit tests for the LoginResponse model in test/features/auth/data/datasources/models/login_response_test.dart.
• Verifies JSON serialization and deserialization for the LoginResponse model.
• Ensures proper handling of diagnostic, data, token, tokenType, and refreshToken fields.
• Fix issue Refresh Token #32

How to test

1. Run flutter test to execute the unit tests.
2. Confirm that all tests pass without errors.
3. Verify that the fromJson and toJson methods handle data correctly.

Screenshot

N/A

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
lib/features/auth/data/models/login_response.dart	100.00% <ø> (ø)
...s/auth/data/repositories/auth_repository_impl.dart	80.76% <100.00%> (ø)
lib/utils/services/hive/main_box.dart	100.00% <ø> (ø)

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