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

GasTankAR/Views/Leads/Signing/LeadSignatureCanvas.swift

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+import SwiftUI
+import PencilKit
+
+struct LeadSignatureCanvas: UIViewRepresentable {
+    @Binding var drawing: PKDrawing
+    @Environment(\.colorScheme) private var colorScheme
+
+    func makeUIView(context: Context) -> PKCanvasView {
+        let view = PKCanvasView()
+        view.delegate = context.coordinator
+        view.drawingPolicy = .anyInput
+        // PencilKit renders black ink as white in Dark Mode, including existing strokes.
+        // Keep the stored ink black; the PDF service exports onto a white document.
+        view.tool = PKInkingTool(.pen, color: .black, width: 2)
+        view.overrideUserInterfaceStyle = colorScheme == .dark ? .dark : .light
+        view.backgroundColor = .clear
+        view.isOpaque = false
+        view.isScrollEnabled = false
+        view.drawing = drawing
+        view.accessibilityLabel = "Unterschrift"
+        view.accessibilityHint = "Mit Finger oder Apple Pencil unterschreiben"
+        return view
+    }
+
+    func updateUIView(_ view: PKCanvasView, context: Context) {
+        context.coordinator.parent = self
+        view.overrideUserInterfaceStyle = colorScheme == .dark ? .dark : .light
+        if view.drawing != drawing {
+            view.drawing = drawing
+        }
+    }
+
+    func makeCoordinator() -> Coordinator { Coordinator(parent: self) }
+
+    final class Coordinator: NSObject, PKCanvasViewDelegate {
+        var parent: LeadSignatureCanvas
+
+        init(parent: LeadSignatureCanvas) { self.parent = parent }
+
+        func canvasViewDrawingDidChange(_ canvasView: PKCanvasView) {
+            parent.drawing = canvasView.drawing
+        }
+    }
+}