fix(settings): surface the actual full-sync error, not just a count

"Synced with 1 error" gave no way to tell what failed. Now lists each
FullSyncSummary.errors entry underneath the summary line.

Outpost/Features/Account/SettingsView.swift

@@ -173,6 +173,7 @@ struct SettingsView: View {
             .frame(maxWidth: 480, alignment: .leading)
 
             if isFullLocalSyncEnabled {
+                VStack(alignment: .leading, spacing: 6) {
                     HStack(spacing: 8) {
                         if isSyncing {
                             ProgressView().controlSize(.small)
@@ -185,7 +186,15 @@ struct SettingsView: View {
                             if let lastFullSyncSummary {
                                 Text(fullSyncSummaryText(lastFullSyncSummary))
                                     .font(.caption)
-                                .foregroundStyle(.secondary)
+                                    .foregroundStyle(lastFullSyncSummary.errors.isEmpty ? .secondary : .red)
+                            }
+                        }
+                    }
+                    if let lastFullSyncSummary, !isSyncing {
+                        ForEach(Array(lastFullSyncSummary.errors.enumerated()), id: \.offset) { _, message in
+                            Text(message)
+                                .font(.caption2)
+                                .foregroundStyle(.red)
                         }
                     }
                 }