Add alternate app icons for iOS

[austin-smith]

Adds an iOS app icon picker, with two initial icon options: Default and Queen of Hearts.

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[chatgpt-codex-connector]

💡 Codex Review

https://github.com/austin-smith/ComputerSolitaire/blob/2e7178b3e68ed00e9454602ab7a262a728d11b5f/Views/AppIconPickerView.swift#L3
Remove UIKit dependency from icon picker

For the iOS settings icon feature, this imports UIKit and the new code uses UIApplication APIs; the repo-level AGENTS.md explicitly marks the app as 100% SwiftUI and says not to add UIKit/AppKit usage or imports. This same dependency is also added in SettingsView, so the change violates the project’s non-negotiable platform contract unless maintainers explicitly approve an exception.

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