[FEATURE] Add an option to display a toast with the preset name

Milkdrop and previous projectM versions displayed the current preset name on the screen whenever it changed. This feature wasn't added yet to the new app. From feedback, many users prefer a "clean screen" approach when using projectM, so this should probably be added as a default-off option.

The easiest way of showing the preset name would be by reusing the "toast" message functionality used for beat sensitivity changes etc., but it's quite prominently shown in the center of the screen. So a more subtle approach might be necessary here, including additional configuration options besides a simple on/off toggle:

• Change the location of the preset name toast
• Change the size and opacity
• Control fade-in/fade-out and display duration
• Change the font, e.g. allow users to select any TTF file for the preset name toast
• Add additional effects like the zoom-in/dissolve effect Milkdrop uses for song titles

Start by locating the existing toast message functionality used for beat sensitivity changes and the entry point where the current preset changes. Review how display settings are configured before deciding which preset-name options are in scope. Done means agreeing on a focused default-off behavior and implementing it with tests or a reproducible check for the displayed message.