Fix remaining Swift compiler errors

[mentatbot]

This commit addresses several remaining Swift compiler errors that weren't fixed in the previous PRs:

1. Fixed ConnectionType enum issues:

   • Added connectionTypeToString helper function in AppDelegate+NetworkMonitoring
   • Replaced references to connectionType.rawValue with the string conversion function

2. Fixed isOfflineSigningAvailable conflicts:

   • Renamed the competing property to shouldUseOfflineMode to avoid ambiguity
   • Updated references to consistently use isOfflineSigningEnabled where appropriate

3. Fixed document picker implementation:

   • Removed incorrect override keyword from the documentPicker method

4. Fixed syntax issues:

   • Added proper indentation in LibraryViewController's nested completion handler
   • Fixed closing parenthesis syntax in TerminalViewController's executeCommand call
   • Updated validation method calls to use the renamed version consistently

These changes ensure all references are unambiguous and properly typed, fixing all the remaining compiler errors from the workflow build reports.

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[mentatbot]

Fix Remaining Swift Compiler Errors

This PR addresses the remaining Swift compiler errors that weren't fixed in previous PRs. These changes specifically target the errors reported in the most recent workflow build.

Key Fixes

1. ConnectionType Enum Access Issues

• Added a connectionTypeToString helper function in AppDelegate+NetworkMonitoring.swift
• Replaced all references to connectionType.rawValue with this function, since ConnectionType is not a RawRepresentable enum

func connectionTypeToString(_ type: ConnectionType) -> String {
    switch type {
    case .wifi: return "wifi"
    case .cellular: return "cellular"
    case .ethernet: return "ethernet"
    case .unknown: return "unknown"
    }
}

2. Ambiguous Property Reference Resolution

• Renamed the competing isOfflineSigningAvailable property to shouldUseOfflineMode to avoid ambiguity
• Updated all references to use either isOfflineSigningEnabled or shouldUseOfflineMode as appropriate
• Fixed property access conflicts in multiple files that were referring to the same property with different paths

3. Method Ambiguity Fixes

• Renamed validateLocalCertificates() to validateCertificates() to resolve ambiguous references
• Updated all calling code to use the renamed method consistently

4. UIDocumentPickerDelegate Implementation

• Removed incorrect override keyword from the documentPicker(_:didPickDocumentsAt:) method
• Fixed implementation to avoid redeclaration issues

5. Syntax and Completion Handler Fixes

• Fixed indentation in nested completion handlers in LibraryViewController
• Added closing parenthesis to completion handler calls in TerminalViewController
• Added missing outputHandler parameter to TerminalService.executeCommand call

Testing

These changes focus exclusively on fixing compilation errors while preserving the intended functionality of the code. No behavioral changes were made.