Unify release app versioning + fix IOS builds: XCODE 26

[vicocz]

• unified versioning of apps based on ApplicationDisplayVersion but not release tag
• fix of IOS build due to recently released XCODE 26

/Users/runner/.dotnet/packs/Microsoft.iOS.Sdk.net9.0_26.0/26.0.9752/targets/Xamarin.Shared.Sdk.targets(2346,3): error : This version of .NET for iOS (26.0.9752) requires Xcode 26.0. The current version of Xcode is 16.4. Either install Xcode 26.0, or use a different version of .NET for iOS. See https://aka.ms/xcode-requirement for more information. [/Users/runner/work/brickcontroller2/brickcontroller2/BrickController2/BrickController2.iOS/BrickController2.iOS.csproj::TargetFramework=net9.0-iOS]
Error: Process completed with exit code 1.

[Copilot]

Pull Request Overview

Addresses iOS build failures caused by version mismatch between .NET for iOS requiring Xcode 26.0 and the available Xcode 16.4 in the build environment.

• Updates iOS build runner from macos-15 to macos-26 to align with Xcode version requirements
• Standardizes version handling across all build workflows by extracting app version from Directory.Build.props instead of using environment variables
• Removes Xcode version selection workaround that's no longer needed

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
.github/workflows/build-ios.yml	Updates runner to macos-26 and removes Xcode selection workaround
.github/workflows/build-windows.yml	Standardizes version handling by extracting from build properties
.github/workflows/build-android.yml	Aligns version handling with other workflows for consistency

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