Complete v4.5.0: Run Sweep intent, detail deep link, and portfolio widget

Finishes the v4.5.0 "Home Screen & Shortcuts reach" scope that the tag shipped
partially:

- Add RunSweepIntent (opens the app and runs refreshAllTrackedDomains via the
  in-process router) and expose it in DomainDigShortcuts.
- Extend the domaindig:// scheme with `sweep` and `domain` (detail) actions;
  route .detail to present TrackedDomainDetailView and .sweep to refresh the
  watchlist. Move DomainDigDeepLink into Shared/ so the widget can build links.
- Add a WidgetKit extension (DomainDigWidgetExtension) with small/medium/large
  Portfolio widgets showing health counts, per-domain status, and certificate
  countdowns; tapping a domain deep-links into its detail.
- Share portfolio state via an App Group (group.net.cleberg.DomainDig): the app
  writes a DomainDigWidgetData snapshot on launch/foreground and on watchlist
  changes and reloads timelines; the widget reads the same store.

1 files changed, 60 insertions, 0 deletions

diff --git a/DomainDig/DomainViewModel+Widget.swift b/DomainDig/DomainViewModel+Widget.swift
new file mode 100644
index 0000000..59b28e0
--- /dev/null
+++ b/DomainDig/DomainViewModel+Widget.swift
@@ -0,0 +1,60 @@
+import Foundation
+import WidgetKit
+
+extension DomainViewModel {
+    /// Publishes the current portfolio state to the App Group container so the
+    /// widget can render it, then asks WidgetKit to refresh its timelines.
+    func refreshWidgetData() {
+        let data = portfolioDashboardData
+        let snapshot = data.snapshot
+
+        let ordered = data.domainStates.sorted { lhs, rhs in
+            if lhs.trackedDomain.isPinned != rhs.trackedDomain.isPinned {
+                return lhs.trackedDomain.isPinned
+            }
+            return lhs.health.widgetSeverityRank > rhs.health.widgetSeverityRank
+        }
+
+        let domains = ordered.prefix(6).map { state in
+            DomainDigWidgetDomain(
+                domain: state.trackedDomain.domain,
+                isPinned: state.trackedDomain.isPinned,
+                status: state.health.widgetStatus,
+                certDaysRemaining: state.certificateDaysRemaining,
+                lastChange: state.lastChangeDate
+            )
+        }
+
+        DomainDigWidgetStore.write(
+            DomainDigWidgetData(
+                generatedAt: Date(),
+                totalDomains: snapshot.totalDomains,
+                healthyCount: snapshot.healthyCount,
+                warningCount: snapshot.warningCount,
+                criticalCount: snapshot.criticalCount,
+                expiringSoonCount: snapshot.expiringSoonCount,
+                unreachableCount: snapshot.unreachableCount,
+                domains: Array(domains)
+            )
+        )
+        WidgetCenter.shared.reloadAllTimelines()
+    }
+}
+
+private extension DomainHealth {
+    var widgetStatus: DomainDigWidgetStatus {
+        switch self {
+        case .healthy: return .healthy
+        case .warning: return .warning
+        case .critical: return .critical
+        }
+    }
+
+    var widgetSeverityRank: Int {
+        switch self {
+        case .healthy: return 0
+        case .warning: return 1
+        case .critical: return 2
+        }
+    }
+}