Introduced the `TryResolveProfileIdAsync` method in the `RecApplicationTestBase` class to resolve a usable profile ID for tests. The method prioritizes a configured `FakeProfileId` and falls back to querying the database for the first available profile. Added necessary namespaces (`System.Linq`, `System.Threading.Tasks`, and `MediatR`) to support LINQ, async operations, and the `ISender` interface. Implemented dependency injection for querying profiles and added error handling to ensure robustness.
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