Add accessibility features: high contrast, blue filter, grayscale, image toggle, and cursor size adjustments

- Implemented high contrast mode toggle with state persistence.
- Added blue filter toggle with visual effect and state persistence.
- Introduced grayscale mode toggle with state persistence.
- Included option to hide/show images with state persistence.
- Added functionality to increase/decrease cursor size with visual feedback.
- Enhanced font size controls with increment, decrement, and reset options.
- Updated accessibility panel UI and button labels for clarity.
- Ensured all new features are accessible and maintain user preferences across sessions.

themes/InterBlue/assets/css/custom.scss

@@ -1607,4 +1607,12 @@ body.high-contrast {
       }
     }
   }
+}
+
+body.blue-filter {
+  filter: sepia(20%) hue-rotate(180deg) brightness(90%);
+}
+
+html.grayscale {
+  filter: grayscale(100%);
 }