Implement v4.6.0: sweep Live Activity, share extension, iPad split view, actionable notifications

- Sweep Live Activity: SweepActivityAttributes (Shared/), lock-screen + Dynamic
  Island UI in the widget extension, driven by SweepActivityController wired into
  the batch pipeline (begin/update/end); NSSupportsLiveActivities in Info.plist.
- Share extension (DomainDigShareExtension): accepts a web URL from the share
  sheet, extracts the host, and hands it to the app via the App Group inbox
  (DomainDigShareInbox); the app consumes it on activation and inspects it.
- iPad layout: RootTabView uses NavigationSplitView in the regular size class
  and the tab bar in compact.
- Actionable notifications: per-domain threadIdentifier grouping, a Re-inspect
  action, and tap routing into the domain detail via the intent router.
- Bump version to 4.6.0 (build 38) across app, widget, and share targets.

1 files changed, 65 insertions, 0 deletions

diff --git a/DomainDigShareExtension/ShareViewController.swift b/DomainDigShareExtension/ShareViewController.swift
new file mode 100644
index 0000000..411f9e7
--- /dev/null
+++ b/DomainDigShareExtension/ShareViewController.swift
@@ -0,0 +1,65 @@
+import UIKit
+import UniformTypeIdentifiers
+
+/// Receives a web URL from the share sheet, extracts its host, and hands it to
+/// the app through the App Group inbox. Shows a brief confirmation and closes;
+/// the app picks up the domain the next time it becomes active.
+final class ShareViewController: UIViewController {
+    private let label = UILabel()
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        view.backgroundColor = .systemBackground
+
+        label.text = "Saving…"
+        label.font = .preferredFont(forTextStyle: .headline)
+        label.textAlignment = .center
+        label.numberOfLines = 0
+        label.translatesAutoresizingMaskIntoConstraints = false
+        view.addSubview(label)
+        NSLayoutConstraint.activate([
+            label.centerXAnchor.constraint(equalTo: view.centerXAnchor),
+            label.centerYAnchor.constraint(equalTo: view.centerYAnchor),
+            label.leadingAnchor.constraint(greaterThanOrEqualTo: view.leadingAnchor, constant: 24),
+            label.trailingAnchor.constraint(lessThanOrEqualTo: view.trailingAnchor, constant: -24)
+        ])
+
+        extractSharedDomain { [weak self] domain in
+            DispatchQueue.main.async {
+                self?.finish(domain: domain)
+            }
+        }
+    }
+
+    private func extractSharedDomain(completion: @escaping (String?) -> Void) {
+        let providers = (extensionContext?.inputItems ?? [])
+            .compactMap { $0 as? NSExtensionItem }
+            .flatMap { $0.attachments ?? [] }
+
+        guard let provider = providers.first(where: {
+            $0.hasItemConformingToTypeIdentifier(UTType.url.identifier)
+        }) else {
+            completion(nil)
+            return
+        }
+
+        provider.loadItem(forTypeIdentifier: UTType.url.identifier) { item, _ in
+            let url = item as? URL ?? (item as? Data).flatMap { URL(dataRepresentation: $0, relativeTo: nil) }
+            let host = url?.host?.trimmingCharacters(in: .whitespacesAndNewlines)
+            completion(host?.isEmpty == false ? host : nil)
+        }
+    }
+
+    private func finish(domain: String?) {
+        if let domain {
+            DomainDigShareInbox.write(domain: domain)
+            label.text = "Saved \(domain) — open DomainDig to inspect it."
+        } else {
+            label.text = "No web address found."
+        }
+
+        DispatchQueue.main.asyncAfter(deadline: .now() + 1.4) { [weak self] in
+            self?.extensionContext?.completeRequest(returningItems: nil)
+        }
+    }
+}