fix: Ensure release objects are not None in update flow integration tests

src/webdrop_bridge/ui/main_window.py

@@ -5,7 +5,7 @@ import logging
 from pathlib import Path
 from typing import Optional
 
-from PySide6.QtCore import QSize, Qt, QThread, QUrl, Signal
+from PySide6.QtCore import QObject, QSize, Qt, QThread, QUrl, Signal
 from PySide6.QtWidgets import QLabel, QMainWindow, QStatusBar, QToolBar, QVBoxLayout, QWidget
 
 from webdrop_bridge.config import Config
@@ -657,9 +657,14 @@ class MainWindow(QMainWindow):
             logger.error("Failed to launch update installer")
 
 
-class UpdateCheckWorker:
+class UpdateCheckWorker(QObject):
     """Worker for running update check asynchronously."""
 
+    # Define signals at class level
+    update_available = Signal(object)  # Emits Release object
+    update_status = Signal(str, str)   # Emits (status_text, emoji)
+    finished = Signal()
+
     def __init__(self, manager, current_version: str):
         """Initialize worker.
         
@@ -667,14 +672,9 @@ class UpdateCheckWorker:
             manager: UpdateManager instance
             current_version: Current app version
         """
+        super().__init__()
         self.manager = manager
         self.current_version = current_version
-        
-        # Create signals
-        from PySide6.QtCore import Signal
-        self.update_available = Signal(object)
-        self.update_status = Signal(str, str)
-        self.finished = Signal()
 
     def run(self) -> None:
         """Run the update check."""