fix: preserve reading font settings in markdown images

- Remove inline styles from custom image component
- Let CSS inheritance handle font and styling properly
- Images now respect user's reading font and size settings

src/components/ContentPanel.tsx

@@ -226,12 +226,6 @@ const ContentPanel: React.FC<ContentPanelProps> = ({
                   src={src} 
                   alt={alt} 
                   {...props}
-                  style={{ 
-                    maxWidth: '100%', 
-                    height: 'auto',
-                    display: 'block',
-                    margin: '1rem auto'
-                  }}
                 />
               )
             }}