Extend library for StructuredQueriesCasePaths

[gmcusaro]

Regarding the post on inheritance, @CasePathable is required to handle enums with associated values.
Extending the library with traits (["StructuredQueriesCasePaths"]) in Package.swift is straightforward. For a standard Xcode project (.xcodeproj), this is not as straightforward, because in Xcode 26.2 using Swift 6.1 the Traits column does not exist in the Xcode Project UI. One possible solution could be a local wrapper package, but this becomes cumbersome and not as automatic as mentioned in the post.
Adding swift-case-paths directly as a dependency doesn't remove the error:
"@Table can only be applied to enum types when the StructuredQueriesCasePaths package trait is enabled (from macro Selection)."
Am I doing something wrong, are there any workarounds I'm missing, or would it be better to avoid enums?

import Foundation
import OSLog
import SQLiteData
import CasePaths // Manually added

@Table
struct RGB: Identifiable, Codable {
    let id: UUID
    var red: Double
    var green: Double
    var blue: Double
    var alpha: Double
    var variantID: Variant.ID
}

@Table
struct Variant: Identifiable, Codable {
    let id: UUID
    var name: String = ""
    var position: Int = 0
    var profile: String?
    var swatchID: Swatch.ID
}

@Table
struct Element: Identifiable {
    let id: UUID
    let paletteID: UUID
    var position: Int = 0
    var kind: Kind

    @CasePathable @Selection
    enum Kind: Codable {  // '@Table' can only be applied to enum types when the 'StructuredQueriesCasePaths' package trait is enabled (from macro 'Selection')
        case swatch(Swatch)
        case scale(Scale)
    }
}

@Table
struct Swatch: Identifiable, Codable {
    let id: UUID
    var name: String = ""
}

@Table
struct Scale: Identifiable, Codable {
    let id: UUID
    var spaceModel: SpaceModel = .rgb
    var swatches: [Swatch]

    enum SpaceModel: Int, Codable {
        case rgb = 0
        case hsl
        case hsv
    }
}