fix: Activity Bar init order - hide_timer must be created before _apply_config

The hide_timer QTimer was being created after _apply_config() was called,
but _apply_config() tries to set the timer interval. This caused:
AttributeError: 'WindowsTaskbar' object has no attribute 'hide_timer'

Fix: Move hide_timer creation to before _apply_config() call.

core/activity_bar.py

@@ -83,14 +83,14 @@ class WindowsTaskbar(QFrame):
         self.is_expanded = False
         self.search_text = ""
         
+        # Auto-hide timer (must be created before _apply_config)
+        self.hide_timer = QTimer(self)
+        self.hide_timer.timeout.connect(self._auto_hide)
+        
         self._setup_window()
         self._setup_ui()
         self._apply_config()
         
-        # Auto-hide
-        self.hide_timer = QTimer(self)
-        self.hide_timer.timeout.connect(self._auto_hide)
-        
         # Show if enabled
         if self.config.enabled:
             self.show()