Fix CI test failures by simplifying isRunningTests check

Remove Bundle.main.bundleIdentifier == nil from isRunningTests
detection as it may have unintended side effects in CI environments.
The XCTestCase class check and XCTestConfigurationFilePath environment
variable are sufficient for detecting both XCTest and Swift Testing.

Author: jackjackbits

bitchat/Services/NotificationService.swift

@@ -17,11 +17,10 @@ import AppKit
 final class NotificationService {
     static let shared = NotificationService()
 
-    /// Returns true if running in test environment (XCTest, Swift Testing, or SPM tests)
+    /// Returns true if running in test environment (XCTest or Swift Testing)
     private var isRunningTests: Bool {
         NSClassFromString("XCTestCase") != nil ||
-        ProcessInfo.processInfo.environment["XCTestConfigurationFilePath"] != nil ||
-        Bundle.main.bundleIdentifier == nil
+        ProcessInfo.processInfo.environment["XCTestConfigurationFilePath"] != nil
     }
 
     private init() {}