Fix Swift compilation errors and warnings

[codegen-sh]

This PR fixes the Swift compilation issues reported by XCPretty:

1. Fixed indentation issues in LibraryViewController.swift that were causing errors:

   • Fixed missing closing braces at the end of extension
   • Properly indented methods that were incorrectly placed outside the extension scope

2. The warning about adding '@preconcurrency' to suppress 'Sendable'-related warnings from module 'WebKit' in WebViewController.swift was already fixed in the file (line 6 has the @preconcurrency annotation).

These changes ensure the code compiles without errors or warnings.

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