Fix Swift compiler warnings and errors

[codegen-sh]

This PR fixes various Swift compiler warnings and errors throughout the codebase:

1. Fixed CoreDataManager.swift:

   • Corrected the UUID type casting logic to check for String first
   • Removed redundant type checks and casts

2. Fixed CoreDataManager+Certificates.swift:

   • Removed unused variable 'backdoorFilename'
   • Fixed 'uuid' variable usage in getCertificateFilePaths

3. Fixed NetworkManager.swift:

   • Added explicit discard of result for sync(execute:) call

4. Fixed CryptoHelper.swift:

   • Changed 'var bufferSize' to 'let bufferSize' since it's never mutated

5. Fixed AILearningManager.swift and related files:

   • Fixed unused results of function calls by removing unnecessary discards
   • Improved function call patterns

6. Fixed AppDelegate+Terminal.swift:

   • Removed unnecessary nil coalescing operator with non-optional Bool values

7. Fixed AppLifecycleManager.swift:

   • Updated deprecated 'windows' property to use UIWindowScene.windows
   • Fixed unused variables

8. Fixed CustomAIContextProvider.swift:

   • Fixed "Cannot find 'isEmpty' in scope" error by using proper condition

These changes maintain the original functionality while addressing all compiler warnings and errors.

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