Fix backup progress state machine: pending queue, resolvedStatus, failure resolution

- BackupEngine: pre-filter assets against ManifestIndex before job.start() so
  totalFiles reflects only pending items (not full gallery). Short-circuit with
  allAlreadySafe() when queue is empty.
- BackupJob: add resolveSuccess() (upgrades stale .failed → .completed after
  reconciliation proves needBackup==0) and allAlreadySafe() for empty-queue case.
- BackupStatusService: expose refreshAndWait(force:) async for pull-to-refresh
  and post-failure reconciliation.
- BackupView: wire resolvedStatus throughout ringContentID, ringMainView,
  ringColor, and actionButton; fix progress label to show pending-queue
  denominator; handle .failed in onChange by reconciling and auto-resolving
  to .completed when counts confirm all photos are safe.

Co-Authored-By: Kutesir <kutesir@provoc.ug>
Co-Authored-By: Sentry <sentry@provoc.ug>

Services/BackupStatusService.swift

@@ -60,6 +60,12 @@ final class BackupStatusService: NSObject, ObservableObject {
         }
     }
 
+    /// Awaitable reconciliation — used by pull-to-refresh and post-failure resolution.
+    func refreshAndWait(force: Bool = true) async {
+        cancelAll()
+        await performRefresh(force: force)
+    }
+
     /// Called by BackupEngine after a completed run with newly uploaded entries.
     /// Applies an optimistic count update, writes the manifest in background, then reconciles.
     func refreshAfterBackup(entries: [ManifestEntry], connection: NASConnection) {