Fix modal being too large in narrow screens

[julien-nc]

closes #418

Because of the trick we use to make the modal larger than possible with the component size prop, it did not behave well on narrow screens. This is setting a max width to 100% which does the job.

Thank you @evrim for reporting this and suggesting a fix (on which we agree 😁).
cc @DaphneMuller

Before

Kooha-2026-03-18-14-48-01.webm

After

Kooha-2026-03-18-14-46-16.webm

Unrelated change: Update npm pkgs.

[DaphneMuller]

cc @marcoambrosini @jancborchardt your requested design change is resolved

[janepie]

Hmm now the outer border including the close button is hidden at some points, any way to prevent that?

[jancborchardt]

Nice!

One thing: Could we use the full height on mobile sizes? It seems odd that there’s a row on the top of unused space, instead of the modal expanding to fill the screen.

[julien-nc]

@janepie We artificially change the style the NcModal component so this has some side effects that are tricky to deal with. I think it's fine like it is now.

@jancborchardt That's something to ask in https://github.com/nextcloud-libraries/nextcloud-vue because it would make sense to have it changed in all the NcModals (i mean, in the NcModal component itself), not just this one in assistant. Right?

I just fixed a bug that only affects this assistant modal and was introduced in this repo.