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

GasTankAR/Views/AR/Projects/ARProjectTankImage.swift

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+import SwiftUI
+
+struct ARProjectTankImage: View {
+    let tank: Tank
+    @Environment(\.tankCatalog) private var catalog
+    @State private var image: UIImage?
+    @State private var failed = false
+
+    var body: some View {
+        Group {
+            if let image {
+                Image(uiImage: image).resizable().scaledToFit()
+            } else if failed {
+                Image(systemName: "cube.transparent").foregroundStyle(.secondary)
+                    .accessibilityLabel("Tankvorschau nicht verfügbar")
+            } else {
+                ProgressView().controlSize(.small)
+            }
+        }
+        .task(id: tank) {
+            image = nil
+            failed = false
+            await Task.yield()
+            guard !Task.isCancelled else { return }
+            if let definition = catalog.definition(for: tank) {
+                image = TankThumbnailRenderer.shared.image(for: definition)
+            }
+            failed = image == nil
+        }
+    }
+}