fix(gui): logging methods don't depend on log_watcher

- log_debug/info/warning/error now use _append_log directly
- Avoids AttributeError when log_watcher is None during init
- LogWatcher is only used for game events, not UI logging

ui/main_window.py

@@ -1142,39 +1142,36 @@ class MainWindow(QMainWindow):
     
     def log_debug(self, source: str, message: str):
         """Log a debug message."""
-        self.log_watcher.emit(LogEvent(
-            timestamp=datetime.now(),
-            level="DEBUG",
-            source=source,
-            message=message
-        ))
+        self._append_log("DEBUG", source, message)
     
     def log_info(self, source: str, message: str):
         """Log an info message."""
-        self.log_watcher.emit(LogEvent(
-            timestamp=datetime.now(),
-            level="INFO",
-            source=source,
-            message=message
-        ))
+        self._append_log("INFO", source, message)
     
     def log_warning(self, source: str, message: str):
         """Log a warning message."""
-        self.log_watcher.emit(LogEvent(
-            timestamp=datetime.now(),
-            level="WARNING",
-            source=source,
-            message=message
-        ))
+        self._append_log("WARNING", source, message)
     
     def log_error(self, source: str, message: str):
         """Log an error message."""
-        self.log_watcher.emit(LogEvent(
-            timestamp=datetime.now(),
-            level="ERROR",
-            source=source,
-            message=message
-        ))
+        self._append_log("ERROR", source, message)
+    
+    def _append_log(self, level: str, source: str, message: str):
+        """Append log message to output."""
+        timestamp = datetime.now().strftime("%H:%M:%S")
+        color = {
+            "DEBUG": "#888888",
+            "INFO": "#4caf50",
+            "WARNING": "#ff9800",
+            "ERROR": "#f44336"
+        }.get(level, "#ffffff")
+        
+        log_entry = f'<span style="color: #666;">[{timestamp}]</span> <span style="color: {color};">[{level}]</span> <span style="color: #aaa;">[{source}]</span> {self.escape_html(message)}'
+        self.log_output.append(log_entry)
+        
+        # Auto-scroll to bottom
+        scrollbar = self.log_output.verticalScrollBar()
+        scrollbar.setValue(scrollbar.maximum())
     
     def escape_html(self, text: str) -> str:
         """Escape HTML special characters."""