Jul 31 - Update PhotoCapture.swift

JanitorialQC/Utils/PhotoCapture.swift

@@ -107,11 +107,22 @@ final class PhotoLocationProvider: NSObject, CLLocationManagerDelegate {
 
 // MARK: - Wire format
 
-enum PhotoCaptureFormat {
+// Explicitly not @MainActor. SWIFT_DEFAULT_ACTOR_ISOLATION = MainActor makes
+// every type MainActor-isolated by default, but this formatter is read from
+// `actor APIClient` while building the photo-upload multipart body — a
+// nonisolated context. Without this the reference warns ("Main actor-isolated
+// static property 'iso8601' can not be referenced from a nonisolated context")
+// and becomes a hard error under the Swift 6 language mode. Same treatment as
+// `Constants` / `ServerConfig` and `SyncManager.isoFormatter` (rule 35).
+nonisolated enum PhotoCaptureFormat {
 
     /// ISO-8601 with an explicit offset — the format the server's
     /// `_parse_client_datetime()` expects. A naive string with no offset would
     /// be read as Eastern wall time, so the offset must always be present.
+    ///
+    /// Created once and reused: formatter init is expensive, and this runs per
+    /// photo upload. Foundation formatters are thread-safe for formatting, so
+    /// sharing one across isolation domains is safe.
     static let iso8601: ISO8601DateFormatter = {
         let f = ISO8601DateFormatter()
         f.formatOptions = [.withInternetDateTime]