06/11 Fix some errors: submission datetime incorrect; inspection & issue not linked, etc

JanitorialQC/JanitorialQCApp.swift

@@ -6,6 +6,52 @@ import SwiftUI
 import SwiftData
 import BackgroundTasks
 import UserNotifications
+import Combine
+
+// ── AppearanceManager ─────────────────────────────────────────────────────────
+// Persists the user's preferred colour scheme to UserDefaults and exposes it
+// as a @Published property so the root view can apply .preferredColorScheme.
+// "system" (nil) means the app follows iOS system appearance — the default.
+
+enum AppearanceMode: String, CaseIterable {
+    case system = "system"
+    case light  = "light"
+    case dark   = "dark"
+
+    var displayName: String {
+        switch self {
+        case .system: return "System"
+        case .light:  return "Light"
+        case .dark:   return "Dark"
+        }
+    }
+
+    /// The SwiftUI ColorScheme value to pass to .preferredColorScheme().
+    /// nil = follow the OS (system default).
+    var colorScheme: ColorScheme? {
+        switch self {
+        case .system: return nil
+        case .light:  return .light
+        case .dark:   return .dark
+        }
+    }
+}
+
+final class AppearanceManager: ObservableObject {
+    static let shared = AppearanceManager()
+    private static let defaultsKey = "jqc.appearanceMode"
+
+    @Published var mode: AppearanceMode {
+        didSet {
+            UserDefaults.standard.set(mode.rawValue, forKey: Self.defaultsKey)
+        }
+    }
+
+    private init() {
+        let saved = UserDefaults.standard.string(forKey: Self.defaultsKey) ?? ""
+        mode = AppearanceMode(rawValue: saved) ?? .system
+    }
+}
 
 // ── AppDelegate — runtime orientation lock ────────────────────────────────────
 // Info.plist must declare all 4 orientations so iPad multitasking is supported
@@ -28,8 +74,9 @@ struct JanitorialQCApp: App {
 
     @UIApplicationDelegateAdaptor(AppDelegate.self) var appDelegate
 
-    @StateObject private var auth = AuthManager.shared
-    @StateObject private var sync = SyncManager.shared
+    @StateObject private var auth       = AuthManager.shared
+    @StateObject private var sync       = SyncManager.shared
+    @StateObject private var appearance = AppearanceManager.shared
 
     init() {
         registerBackgroundTasks()
@@ -44,6 +91,8 @@ struct JanitorialQCApp: App {
             ContentView()
                 .environmentObject(auth)
                 .environmentObject(sync)
+                .environmentObject(appearance)
+                .preferredColorScheme(appearance.mode.colorScheme)
         }
         .modelContainer(for: [
             LocalFacility.self,