Right panel sidebar div should be flex instead of block

[pat-s]

What version of starlight are you using?

0.34.3

What is your idea?

Currently, the right-sidebar-panel class is using lg:sl-block, which results in a fixed box.
This is an issue once the right-sidebar becomes more narrow (e.g. through a theme) and a heading displayed in the ToC is exceeding the panel width. (the default starlight theme has a very wide right sidebar and won't likely be affected in practice).

Due to display: block, this results in a horizontal scroll of the div, but initially makes the heading overflow the page page width.

When using display: flex instead, the ToC entries are properly wrapped within the panel boundaries as the panel itself does not overflow the page width.

Current	display: flex

Why is this feature necessary?

Catch edge cases of possible overflows in the right sidebar by default.

Do you have examples of this feature in other projects?

No response

Participation

• I am willing to submit a pull request for this feature.