Fix XCPretty analysis issues: 4 errors and 29 warnings

[codegen-sh]

This PR addresses all the issues identified in the XCPretty analysis report, including 4 errors and 29 warnings.

Errors Fixed:

1. Made TransferPreview initializer public to fix "'TransferPreview' initializer is inaccessible due to 'private' protection level"
2. Fixed "extra argument 'isSharing' in call" by ensuring the method signature matches the call
3. Fixed "cannot infer contextual base in reference to member 'pageSheet'" by explicitly specifying UIModalPresentationStyle.pageSheet
4. Added missing importFile method to HomeViewController to fix "cannot find 'importFile' in scope"

Warnings Fixed:

1. Fixed "memoryObserverLocal mutated after capture by sendable closure" by creating the observer first, then assigning it to the local variable
2. Fixed "conditional cast from 'ChatViewController' to 'any UISheetPresentationControllerDelegate' always succeeds" by removing unnecessary cast
3. Fixed "variable 'self' was written to, but never read" by removing unnecessary assignment
4. Fixed "'catch' block is unreachable because no errors are thrown in 'do' block" by removing unnecessary try-catch
5. Fixed "no method declared with Objective-C selector 'uploadCertificateFile:completion:'" by ensuring correct method signature
6. Fixed "value 'password' was defined but never used" by ensuring proper usage
7. Fixed "no calls to throwing functions occur within 'try' expression" by removing unnecessary try
8. Fixed "function call causes an infinite recursion" by correcting recursive method call
9. Fixed "value 'self' was defined but never used" by ensuring proper usage
10. Fixed "conditional cast from 'UISheetPresentationController' to 'UISheetPresentationController' always succeeds" by removing unnecessary cast
11. Fixed "conditional cast from 'DirectoryViewController' to 'HomeViewController' always succeeds" by removing unnecessary cast
12. Fixed "'windows' was deprecated in iOS 15.0" by using UIWindowScene.windows on iOS 15+
13. Fixed "left side of nil coalescing operator '??' has non-optional type 'UIColor'" by removing unnecessary nil coalescing
14. Fixed "cast from 'String' to unrelated type 'UUID' always fails" by using proper UUID conversion
15. Fixed "conditional cast from 'String' to 'String' always succeeds" by using type checking instead

All fixes were made with minimal changes to maintain the intended functionality of the code.

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