Guard NavigationLink destination inits against deleted @Models

A closure-based NavigationLink builds its destination view eagerly for
every row on every parent-list body evaluation — including the view-graph
update SwiftUI runs the instant SyncEngine.delete does context.delete +
save. Mapping the row's just-deleted @Model to a document there reads a
persisted property on a dead model, which traps in SwiftData
(_InitialBackingData.getValue -> assertionFailure). This is the "Crashed
when deleted a workout" TestFlight report on 2.3 (124).

Add WorkoutDocument(fromLive:) (nil when isDeleted) + a .deletedPlaceholder
and route every destination-init / updatedAt-absorb map through it:
phone WorkoutLogListView + SplitDetailView (read split.id) and watch
WorkoutLogListView. Fixes the whole crash class, not just the report.

Claude-Session: https://claude.ai/code/session_01BQcEWmAPA78338QuEwRkAh

Workouts Watch App/Views/WorkoutLogListView.swift

@@ -28,7 +28,11 @@ struct WorkoutLogListView: View {
 
     init(workout: Workout) {
         self.workout = workout
-        _doc = State(initialValue: WorkoutDocument(from: workout))
+        // A closure-based `NavigationLink` builds this destination eagerly for every
+        // row in the parent list — including during the update that fires when a phone
+        // push removes a workout — so map only a live entity; a deleted one traps in
+        // SwiftData. The placeholder is never shown (the row is on its way out).
+        _doc = State(initialValue: WorkoutDocument(fromLive: workout) ?? .deletedPlaceholder)
     }
 
     /// The split this workout came from (read-only on the watch), used to offer
@@ -109,8 +113,10 @@ struct WorkoutLogListView: View {
         // at. Clock skew across devices degrades this to a skipped absorb —
         // never to a clobber of local state.
         .onChange(of: workout.updatedAt) { _, incoming in
-            if incoming > doc.updatedAt {
-                doc = WorkoutDocument(from: workout)
+            // ...but never absorb from an entity a push has just deleted: mapping a
+            // deleted @Model traps.
+            if incoming > doc.updatedAt, let fresh = WorkoutDocument(fromLive: workout) {
+                doc = fresh
             }
         }
         .navigationDestination(item: $selectedLogID) { logID in