[Electric-Coin-Company#1463] Crash of background task

- The TCA's side effect must be called on a main thread to avoid concurrency clash

Author: LukasKorba

CHANGELOG.md

@@ -6,6 +6,9 @@ directly impact users rather than highlighting other crucial architectural updat
 
 ## [Unreleased]
 
+### Fixed
+- Crash in the background task during the overnight sync.
+
 ## 1.4 build 2 (2025-03-06)
 
 ### Added

secant/AppDelegate.swift

@@ -127,7 +127,9 @@ extension AppDelegate {
         task.expirationHandler = { [rootStore] in
             LoggerProxy.event("BGTask startBackgroundTask expirationHandler called")
             // stop the syncing because the allocated time is about to expire
-            rootStore.send(.initialization(.appDelegate(.didEnterBackground)))
+            DispatchQueue.main.async {
+                rootStore.send(.initialization(.appDelegate(.didEnterBackground)))
+            }
         }
     }