Reflect watch-forwarded workout progress on the phone immediately

ingestFromWatch now upserts the SwiftData cache directly after writing the file,
instead of relying on the NSMetadataQuery observer — a same-process file
overwrite doesn't reliably emit a modified event, so watch progress never reached
open iPhone screens. iCloud Drive stays the source of truth (file written first);
the observer re-applies idempotently if it fires.

Claude-Session: https://claude.ai/code/session_018gg69MaUetDNzWzBXisfMV

Workouts/Sync/SyncEngine.swift

@@ -112,10 +112,20 @@ final class SyncEngine {
         onCacheChanged?()
     }
 
-    /// Apply a workout received from the watch through the normal write path
-    /// (file → observer → cache), keeping iCloud Drive the single source of truth.
+    /// Apply a workout received from the watch. iCloud Drive stays the source of
+    /// truth (we write the file), but we also upsert the cache directly here.
+    ///
+    /// The phone's own edits drive a local view copy, so they don't need this — but a
+    /// watch-originated change has nothing else refreshing the phone UI, and a
+    /// same-process file overwrite doesn't reliably wake the `NSMetadataQuery`
+    /// observer. Upserting the doc we just wrote keeps cache and file consistent (the
+    /// observer re-applies idempotently if it does fire) and lets open phone screens
+    /// reflect watch progress live.
     func ingestFromWatch(_ doc: WorkoutDocument) async {
         await save(workout: doc)
+        CacheMapper.upsertWorkout(doc, relativePath: doc.relativePath, into: context)
+        try? context.save()
+        onCacheChanged?()
     }
 
     // MARK: - Public CRUD (write path: files only)