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

GasTankAR/Views/Leads/Detail/LeadDetailPresentation.swift

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+import SwiftUI
+
+enum LeadDetailStyle {
+    static let blue = LeadOverviewStyle.blue
+    static let background = Color(uiColor: .systemGroupedBackground)
+    static let card = Color(uiColor: .secondarySystemGroupedBackground)
+}
+
+extension LeadDetail {
+    var initials: String {
+        String(lead.displayName.split(separator: " ").prefix(2).compactMap(\.first)).uppercased()
+    }
+
+    var contactDescription: String? {
+        let value = [contactName, contactRole].compactMap { $0 }.joined(separator: " · ")
+        return value.isEmpty ? nil : value
+    }
+
+    var phoneURL: URL? {
+        guard let phone = lead.phoneNumber else { return nil }
+        let digits = phone.filter { $0.isNumber || $0 == "+" }
+        return digits.isEmpty ? nil : URL(string: "tel:\(digits)")
+    }
+
+    var emailURL: URL? {
+        guard let email, !email.isEmpty else { return nil }
+        var url = URLComponents()
+        url.scheme = "mailto"
+        url.path = email
+        return url.url
+    }
+
+    var routeURL: URL? {
+        var url = URLComponents()
+        url.scheme = "https"
+        url.host = "maps.apple.com"
+        url.queryItems = [URLQueryItem(name: "daddr", value: lead.fullAddress)]
+        return url.url
+    }
+}
+
+extension LeadOffer {
+    var subtitle: String {
+        let kindName: String
+        switch kind {
+        case .purchase: kindName = "Kauf"
+        case .rental: kindName = "Miete"
+        case .service: kindName = "Service"
+        }
+        let price = amount.formatted(.currency(code: "EUR").locale(Locale(identifier: "de_DE")))
+        let interval: String
+        switch billing {
+        case .once: interval = "netto"
+        case .monthly: interval = "/ Monat"
+        case .annually: interval = "/ Jahr"
+        }
+        let date = acceptedAt ?? validUntil
+        let suffix = date.map {
+            (acceptedAt == nil ? "gültig bis " : "angenommen am ")
+            + $0.formatted(.dateTime.day().month().year().locale(Locale(identifier: "de_DE")))
+        }
+        return [id, kindName, "\(price) \(interval)", suffix].compactMap { $0 }.joined(separator: " · ")
+    }
+}
+
+struct LeadSectionHeading: View {
+    let title: LocalizedStringKey
+    var body: some View {
+        Text(title).font(.caption).foregroundStyle(.secondary)
+            .padding(.horizontal, 16)
+    }
+}
+
+struct LeadSignatureProgress: View {
+    let signed: Int
+    let total: Int
+    var body: some View {
+        if total > 0 && signed == total {
+            Label("Vollständig", systemImage: "checkmark.circle.fill")
+                .foregroundStyle(.green).font(.subheadline)
+        } else {
+            Text("\(signed) von \(total)").foregroundStyle(.secondary).font(.subheadline)
+        }
+    }
+}
+
+struct LeadSignButton: View {
+    let action: () -> Void
+
+    var body: some View {
+        Button(action: action) {
+            Label("Unterschreiben", systemImage: "signature")
+                .font(.subheadline.weight(.medium))
+        }
+        .buttonStyle(.borderedProminent)
+        .buttonBorderShape(.capsule)
+    }
+}
+
+extension Error {
+    var leadFileMessage: LocalizedStringResource {
+        if let error = self as? LeadError { return error.message }
+        switch self as? LeadFileError {
+        case .notFound: return "Diese Datei ist nicht mehr verfügbar."
+        case .invalidFile: return "Die heruntergeladene Datei ist ungültig und kann nicht geöffnet werden."
+        case .storageUnavailable: return "Die Datei konnte nicht auf diesem Gerät gespeichert werden."
+        case nil: return "Die Datei konnte nicht geladen werden. Bitte versuche es erneut."
+        }
+    }
+}