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

GasTankAR/Views/Leads/Shared/LeadPDFView.swift

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+import SwiftUI
+import PDFKit
+
+struct LeadPDFView: UIViewRepresentable {
+    let url: URL
+    var signaturePlacement: PDFSignaturePlacement?
+    var fitsWholePage = false
+    var onPageChanged: ((Int, Int) -> Void)?
+
+    func makeUIView(context: Context) -> PDFView {
+        let view = PDFView()
+        view.displayMode = fitsWholePage ? .singlePage : .singlePageContinuous
+        if fitsWholePage {
+            view.displayDirection = .horizontal
+            view.usePageViewController(true)
+        }
+        view.autoScales = true
+        view.backgroundColor = .secondarySystemGroupedBackground
+        context.coordinator.observe(view)
+        return view
+    }
+
+    func updateUIView(_ view: PDFView, context: Context) {
+        context.coordinator.onPageChanged = onPageChanged
+        guard view.document?.documentURL != url else { return }
+        view.document = PDFDocument(url: url)
+        view.autoScales = true
+        if let signaturePlacement,
+           let page = view.document?.page(at: signaturePlacement.pageIndex) {
+            // The marker exists only in the preview; the signing service reads the original file.
+            let marker = PDFAnnotation(bounds: signaturePlacement.bounds, forType: .square, withProperties: nil)
+            marker.color = .systemOrange
+            marker.interiorColor = UIColor.systemOrange.withAlphaComponent(0.08)
+            marker.contents = "Unterschrift Kunde"
+            let border = PDFBorder()
+            border.lineWidth = 1
+            border.style = .dashed
+            border.dashPattern = [3, 2]
+            marker.border = border
+            page.addAnnotation(marker)
+            view.go(to: page)
+        }
+        context.coordinator.report(view)
+    }
+
+    func makeCoordinator() -> Coordinator { Coordinator() }
+
+    final class Coordinator: NSObject {
+        var onPageChanged: ((Int, Int) -> Void)?
+
+        func observe(_ view: PDFView) {
+            NotificationCenter.default.addObserver(
+                self, selector: #selector(pageChanged(_:)), name: .PDFViewPageChanged, object: view
+            )
+        }
+
+        @objc private func pageChanged(_ notification: Notification) {
+            guard let view = notification.object as? PDFView else { return }
+            report(view)
+        }
+
+        func report(_ view: PDFView) {
+            guard let document = view.document, let page = view.currentPage else { return }
+            let number = document.index(for: page) + 1
+            let count = document.pageCount
+            // Avoid changing SwiftUI state while the representable is updating.
+            Task { @MainActor [weak self] in self?.onPageChanged?(number, count) }
+        }
+
+        deinit { NotificationCenter.default.removeObserver(self) }
+    }
+}