Add font-variant-numeric to selected files list

[victorlap]

• Resolves: [Bug]: "n selected" does not use tnum #55734

Summary

This PR adds font-variant-numeric to selected files list, so the text doesn't jump around when selecting multiple files.

Screenshots

Before

Screen.Recording.2025-10-18.at.13.45.24.mov

After

Screen.Recording.2025-10-18.at.13.45.00.mov

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)
• Labels added where applicable (ex: bug/enhancement, 3. to review, feature component)
• Milestone added for target branch/version (ex: 32.x for stable32)

[susnux]

Very nice, thank you!

[szaimen]

LGTM based on the screen recording. Thanks! :)

(but did not test)

[skjnldsv]

Nice! TIL

[skjnldsv]

Ah, we cannot use the bot to create clone branches, I forgot that doesn't work

[welcome]

Thanks for your first pull request and welcome to the community! Feel free to keep them coming! If you are looking for issues to tackle then have a look at this selection: https://github.com/nextcloud/server/issues?q=is%3Aopen+is%3Aissue+label%3A%22good+first+issue%22

[skjnldsv]

/backport to stable32

[susnux]

/backport to stable31

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