Added OOBE for MAUI

[d2dyno1]

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[Copilot]

Pull Request Overview

This PR adds a comprehensive Out-of-Box Experience (OOBE) for the MAUI platform with iOS biometric authentication support and various improvements across the codebase.

• Implements complete iOS biometric authentication using Face ID/Touch ID
• Adds a new introduction/onboarding screen for MAUI with multi-slide gallery interface
• Refactors method names from "NoThrow" to "NoFailure" and authentication method names for consistency
• Updates settings property from "IsIntroduced" to "WasIntroduced" for OOBE tracking

Reviewed Changes

Copilot reviewed 76 out of 91 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
SafetyHelpers.cs	Renames all "NoThrow" methods to "NoFailure" for consistency
IAuthenticator.cs	Renames CreateAsync/SignAsync to EnrollAsync/AcquireAsync with improved documentation
AuthenticationExtensions.cs	Updates to use renamed authenticator methods
MainViewModel.cs	Removes commented OOBE code
VaultProtectedKeyDataModel.cs	Adds new data model for protected key storage
IntroductionPage.xaml/cs	Implements new MAUI introduction screen with gallery navigation
IOSBiometricViewModel.cs	Adds iOS biometric authentication using Secure Enclave
Various MAUI files	Updates UI templates, styles, and resources for iOS support

Comments suppressed due to low confidence (2)

src/Platforms/SecureFolderFS.Maui/Views/IntroductionPage.xaml.cs:1

• No bounds checking before decrementing _currentIndex. This could result in negative indices or accessing non-existent slide resources, potentially causing runtime exceptions.

using SecureFolderFS.Maui.Helpers;

src/Platforms/SecureFolderFS.Maui/Views/IntroductionPage.xaml.cs:1

• No bounds checking before incrementing _currentIndex. This could result in accessing slide resources beyond the available range, potentially causing runtime exceptions.

using SecureFolderFS.Maui.Helpers;

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