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, 19 insertions, 0 deletions

diff --git a/DomainDig/RootTabView.swift b/DomainDig/RootTabView.swift
index 72038a1..9823d37 100644
--- a/DomainDig/RootTabView.swift
+++ b/DomainDig/RootTabView.swift
@@ -12,6 +12,7 @@ struct RootTabView: View {
     @Bindable var viewModel: DomainViewModel
     @State private var purchaseService = PurchaseService.shared
     @State private var intentRouter = DomainDigIntentRouter.shared
+    @State private var detailDomain: TrackedDomain?
     @State private var selectedTab: RootTab = FeatureAccessService.currentTier == .free ? .inspect : .dashboard
 
     var body: some View {
@@ -83,6 +84,11 @@ struct RootTabView: View {
                 selectedTab = .dashboard
             }
         }
+        .sheet(item: $detailDomain) { trackedDomain in
+            NavigationStack {
+                TrackedDomainDetailView(viewModel: viewModel, trackedDomain: trackedDomain)
+            }
+        }
         .onOpenURL { url in
             guard let action = DomainDigDeepLink.action(from: url) else { return }
             perform(action)
@@ -113,6 +119,19 @@ struct RootTabView: View {
             if viewModel.trackDomain(domain: domain, availabilityStatus: nil) {
                 selectedTab = .dashboard
             }
+        case let .detail(domain):
+            // Open the tracked domain's detail (e.g. from a widget tap). If it is
+            // no longer tracked, fall back to inspecting it.
+            if let tracked = viewModel.trackedDomains.first(
+                where: { $0.domain.caseInsensitiveCompare(domain) == .orderedSame }
+            ) {
+                detailDomain = tracked
+            } else {
+                perform(.inspect(domain))
+            }
+        case .sweep:
+            selectedTab = .dashboard
+            viewModel.refreshAllTrackedDomains()
         }
     }
 }