[cyanzhong]

https://developer.apple.com/documentation/xcode/updating-your-xcode-project-configuration-file-format

[Copilot]

🔵 Needs a closer look

The project-format replacement requires Xcode 27 validation of package/plugin resolution, target builds and tests, and archive embedding/signing that this review environment cannot perform.

No open issues 🎉

What changed in this PR

Migrates MarkEdit’s Xcode project from project.pbxproj to the new project.xcproj configuration format.

Changes:

• Moves the app, tests, Quick Look extension, and update installer target definitions into the new format.
• Carries over source and resource membership, package products, build phases, and build settings.
• Consolidates shared Debug and Release settings using configuration-specific keys.

File	Description
MarkEdit.xcodeproj/​project.xcproj	Adds the migrated project configuration for all four targets.
MarkEdit.xcodeproj/​project.pbxproj	Removes the legacy project configuration.

_{Review effort: Balanced}