fix: Disable EU focus detection by default - fixes 4.5s UI freeze

Changes:
- Fixed is_focused property (was calling as method)
- EU focus detection now DISABLED by default
- Added auto_show_on_focus setting (default: false)
- Hard disable if focus check takes >1 second
- ActivityBarConfig now includes auto_show_on_focus setting

This prevents the EnumWindows blocking that was causing 4.5s freezes.
Users can manually enable in settings if they want auto-show behavior.

core/activity_bar.py

@@ -31,6 +31,7 @@ class ActivityBarConfig:
     icon_size: int = 32
     auto_hide: bool = True
     auto_hide_delay: int = 3000  # milliseconds
+    auto_show_on_focus: bool = False  # DISABLED by default - causes UI freezing
     pinned_plugins: List[str] = None
     
     def __post_init__(self):
@@ -44,6 +45,7 @@ class ActivityBarConfig:
             'icon_size': self.icon_size,
             'auto_hide': self.auto_hide,
             'auto_hide_delay': self.auto_hide_delay,
+            'auto_show_on_focus': self.auto_show_on_focus,
             'pinned_plugins': self.pinned_plugins
         }
     

core/main.py

@@ -465,19 +465,30 @@ class EUUtilityApp:
         """Start timer to detect EU window focus and show/hide activity bar."""
         from PyQt6.QtCore import QTimer
         
+        # Check if disabled in settings
+        settings = get_settings()
+        if not settings.get('activity_bar.auto_show_on_focus', False):
+            debug_logger.info("MAIN", "EU focus detection DISABLED in settings (activity_bar.auto_show_on_focus=false)")
+            return
+        
         debug_logger.info("MAIN", "Starting EU focus detection...")
         debug_logger.start_timer("MAIN_start_eu_focus")
         
         self.eu_focus_timer = QTimer(self.app)
         self.eu_focus_timer.timeout.connect(self._check_eu_focus)
-        self.eu_focus_timer.start(5000)  # Check every 5 seconds (reduced from 2s for debugging)
+        self.eu_focus_timer.start(5000)  # Check every 5 seconds
         self._last_eu_focused = False
+        self._focus_detection_disabled = False  # Will be set to True if too slow
         
         debug_logger.end_timer("MAIN_start_eu_focus")
         debug_logger.info("MAIN", "EU focus detection started (5s interval)")
     
     def _check_eu_focus(self):
         """Check if EU window is focused and show/hide activity bar."""
+        # HARD DISABLE: If focus detection has been slow before, don't run it again
+        if getattr(self, '_focus_detection_disabled', False):
+            return
+        
         debug_logger.start_timer("MAIN_check_eu_focus")
         
         try:
@@ -498,7 +509,7 @@ class EUUtilityApp:
             
             if eu_window:
                 debug_logger.debug("MAIN", "EU window found, checking focus...")
-                is_focused = eu_window.is_focused()
+                is_focused = eu_window.is_focused  # Property, not method!
                 debug_logger.debug("MAIN", f"EU focused: {is_focused}, last: {getattr(self, '_last_eu_focused', None)}")
                 
                 if is_focused != getattr(self, '_last_eu_focused', False):
@@ -551,6 +562,14 @@ class EUUtilityApp:
         if elapsed > 100:  # Log if taking more than 100ms
             debug_logger.warn("MAIN", f"EU focus check took {elapsed:.2f}ms - SLOW!")
             
+            # HARD DISABLE: If focus detection is slow, permanently disable it
+            if elapsed > 1000:  # More than 1 second - this is killing the UI
+                debug_logger.error("MAIN", "FOCUS DETECTION TOO SLOW - DISABLING PERMANENTLY!")
+                self._focus_detection_disabled = True
+                if hasattr(self, 'eu_focus_timer'):
+                    self.eu_focus_timer.stop()
+                    debug_logger.info("MAIN", "EU focus detection DISABLED to prevent UI freezing")
+    
     def _load_overlay_widgets(self):
         """Load saved overlay widgets."""
         widget_settings = self.settings.get('overlay_widgets', {})