Add Ugh.design an instant dither design generator with SVG export

[aduttya]

What is this?

This PR adds Ugh.design to the appropriate category in the list.

Tool description

Ugh.design is a real-time dither design generator that runs multiple algorithms (Atkinson, Floyd-Steinberg, Halftone, Crosshatch, Glitch, etc.) directly in the browser. It allows users to control parameters like scale, rotation, contrast and noise, with instant visual feedback. It supports true SVG vector export as well as high-resolution PNG with transparency.

Why add this tool?

• Provides multiple dithering algorithms in a single interface (most tools offer only one).
• Real-time parameter control makes it useful for rapid experimentation.
• True SVG export (vector output, not rasterized) makes it practical for production workflows (e.g., Figma, print, large-scale assets).
• Includes a community gallery for inspiration and exploration.

Checklist

• I have searched existing entries to avoid duplicates.
• The entry follows the required link format.
• Description starts with a lowercase letter and ends with a period.
• No unnecessary hype or promotional language is included.
• The tool is added in alphabetical order within its category.

Let me know if you'd prefer this under a different category.