Here is a summary of the improvements introduced across the files:

• Semantic Upgrades: Converted generic span controls in the settings panels to standard native <button> tags to allow default keyboard interaction.
• Accessibility Enhancements: Added ARIA dialog properties, modal focus tags, and visual keyboard outlines (:focus-visible) to help screen readers.
• Expanded Customization: Integrated over a dozen newly designed icons (including curved arrows, squircles, coffee cups, rockets, and custom shapes).
• Layout Correction: Resolved double-defined layout alignment rules inside the custom shape selector grid stylesheet.
• Keyboard Navigation: Introduced a keydown listener to support standard selection of custom settings presets and menus via standard navigation keys.
• Optimized Scroll Tracking: Prevented layout thrashing during drag interactions by caching the target scroll parent on touch start rather than recursively querying on every touchmove event.
• Smoothed Animations: Scheduled drag position and translation adjustments inside requestAnimationFrame cycles to lower animation latency on dynamic displays.
• Viewport Safeguards: Wrapped Visual Viewport listeners in a safety fallback container to maintain consistency across various tab environments.