Colours need changing to be in line with style guide.

```
...
selection_background #939ab7
selection_background_opacity 0.2
...
# URL underline color when hovering with mouse
url_color #8aadf4
...
# Colors for marks (marked text in the terminal)
mark1_foreground #181926
mark1_background #b7bdf8
mark2_foreground #181926
mark2_background #c6a0f6
mark3_foreground #181926
mark3_background #7dc4e4
...
```
Colours for selection_background have changed to Overlay 2 0.2 opac, foreground removed to allow underneath highlighting colours original, same can be done for cursor_text_color. url_color updated to blue. Tab bar colours uncertain, but the bar itself should be a different colour as a surface-element, but I've set mine to mantle in macchiato for comfort. mark foreground should be crust for macchiato, mocha and frappe, unlike what it is right now, which is base.

Start by locating the Kitty theme or configuration entries for selection, URL, mark, cursor, and tab-bar colours. Compare those entries with the style guide and the requested macchiato, mocha, and frappe changes. Done means the specified colour and opacity settings are aligned, with the tab-bar treatment resolved.

Written by the indexing model from the issue text.