refactor(dto): type duration_minutes as int to match backend

[CowboyGH]

🚀 Summary

The backend now returns duration_minutes as an integer instead of a string, so this PR updates the mobile DTOs to match. Both TestingCatalogItemDto and WorkoutSummaryDto now type the field as int, and the related mappers simply pass the value through.

The defensive _parseDurationMinutes helpers in the workout overview and details mappers are no longer needed and have been removed, along with the now-obsolete "invalid duration" test case. Fixtures were updated to use integer literals.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 0d5a42ed-439c-4181-9fa5-55263e34972f

📥 Commits

Reviewing files that changed from the base of the PR and between 04a844c and 178c147.

📒 Files selected for processing (8)

• lib/features/tests/catalog/data/dto/testing_catalog_item_dto.dart
• lib/features/tests/catalog/data/mappers/testing_catalog_mapper.dart
• lib/features/workouts/data/dto/workout_summary_dto.dart
• lib/features/workouts/data/mappers/workout_details_mapper.dart
• lib/features/workouts/data/mappers/workout_overview_mapper.dart
• test/features/tests/catalog/data/mappers/testing_catalog_mapper_test.dart
• test/features/tests/catalog/support/testings_dto_fixtures.dart
• test/features/workouts/support/workouts_dto_fixtures.dart

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/duration-minutes-int

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