Mobile: Copy-button hides text for long single-line code blocks

[Jan-Koll]

For single-line code blocks that have a horizontal overflow, the copy-button hides a few characters from the end of the text on small screens.

See e.g. https://svelte.dev/docs/svelte/$props#Renaming-props:

The line should end with ... = $props(); but instead it only shows ... = $prop (and the last p is also cut in half).