Add lead workflows, PDF signing, AR projects and photo gallery integration

GasTankAR/Data/Leads/LeadARPhotoStore.swift

@@ -0,0 +1,27 @@
+import Foundation
+import SwiftData
+
+/// Reads project photos through the lead association in a fresh context after AR closes.
+@MainActor
+final class LeadARPhotoStore {
+    private let context: ModelContext
+
+    init(container: ModelContainer) {
+        context = ModelContext(container)
+        context.autosaveEnabled = false
+    }
+
+    func photos(for leadID: String) throws -> [ProjectPhoto] {
+        let links = try context.fetch(FetchDescriptor<LeadARProjectLink>(
+            predicate: #Predicate { $0.leadID == leadID }))
+        let legacy = try context.fetch(FetchDescriptor<Project>(
+            predicate: #Predicate { $0.leadID == leadID }))
+        var projects = links.compactMap(\.project)
+        let linkedIDs = Set(projects.map(\.projectID))
+        projects.append(contentsOf: legacy.filter { !linkedIDs.contains($0.projectID) })
+        var seen = Set<PersistentIdentifier>()
+        return projects.flatMap(\.photos)
+            .filter { seen.insert($0.persistentModelID).inserted }
+            .sorted { $0.creationDate > $1.creationDate }
+    }
+}