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

GasTankAR/Views/Leads/Signing/LeadSigningHeaderView.swift

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+import SwiftUI
+
+struct LeadSigningHeaderView: ToolbarContent {
+    let offerID: String
+    let current: Int
+    let total: Int
+    let isComplete: Bool
+    let isSigning: Bool
+    let canConfirm: Bool
+    let onClose: () -> Void
+
+    var body: some ToolbarContent {
+        ToolbarItem(placement: .cancellationAction) {
+            Button(role: .cancel, action: onClose)
+                .labelStyle(.iconOnly)
+                .disabled(isSigning)
+        }
+        ToolbarItem(placement: .principal) {
+            VStack(spacing: 3) {
+                Text(offerID).font(.headline)
+                if isComplete {
+                    Text("Alle Dokumente unterschrieben").font(.caption).foregroundStyle(.secondary)
+                } else {
+                    Text("Dokument \(current) von \(total)").font(.caption).foregroundStyle(.secondary)
+                }
+            }
+        }
+        ToolbarItem(placement: .confirmationAction) {
+            Button(role: .confirm, action: onClose)
+                .labelStyle(.iconOnly)
+                .disabled(!canConfirm)
+        }
+    }
+}