Fix error and error-behind css classes out-of-sync

[yoKurt94]

The error-behind in some cases line breaks before error does, e.g. in docs/handbook/2/objects.html:

you can see

'string[]'.

of the error-behind, which is supposed to be invisible, in the next line.

The problem is that the CSS classes error and behind-error are slightly out of sync:

1. The margin-right: -2px is obsolete

• this rule is no longer necessary due to the padding adjustments described below

2. The padding of error should be 6px 8px 6px 12px

• it was 6px 6px 6px 14px, but 14px is too much since the ancestor <pre class="shiki light-plus twoslash lsp" ...> has a border of 1px + 12px padding
• since the error class has a border-right: 2px which hangs 1px over the border of the <pre> element, the padding should be 12px
• the right padding of 8px compensates the removed margin-right: -2px
• incorrect padding lead to misalignment:

3. the error-behind span line breaks before the error span

• since error is absolute, it ignores the right padding of the ancestor <pre> of 12px
• therefore, the inner span of error needs a margin-right: 12px to wrap simultaneously

[github-actions]

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