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, 28 insertions, 0 deletions

diff --git a/Shared/DomainDigShareInbox.swift b/Shared/DomainDigShareInbox.swift
new file mode 100644
index 0000000..3a577e7
--- /dev/null
+++ b/Shared/DomainDigShareInbox.swift
@@ -0,0 +1,28 @@
+import Foundation
+
+/// App Group handoff from the share extension to the app.
+///
+/// Share extensions cannot reliably open their host app, so the extension
+/// drops the shared domain here and the app consumes it the next time it
+/// becomes active, routing it into an inspection.
+enum DomainDigShareInbox {
+    private static let key = "pendingInspectDomain"
+
+    private static var defaults: UserDefaults? {
+        UserDefaults(suiteName: DomainDigWidgetStore.appGroupID)
+    }
+
+    static func write(domain: String) {
+        defaults?.set(domain, forKey: key)
+    }
+
+    /// Returns and clears the pending domain, if any.
+    static func consume() -> String? {
+        guard let defaults,
+              let domain = defaults.string(forKey: key),
+              !domain.isEmpty
+        else { return nil }
+        defaults.removeObject(forKey: key)
+        return domain
+    }
+}