fix(core): restore app menu label, show "Settings" for sub-sections

[pringelmann]

* Resolves: #60803

## Summary

Two follow-ups from #60757.

Settings sub-section names ("Personal info", "Appearance and accessibility", ...) were too long to fit next to the centered search, which is why we hid the label below 1400px. Show "Settings" for any type === 'settings' entry instead, and restore the always-visible label at >= 1024px with the original width cap.

Preview url: https://nc-preview.tail22c02b.ts.net/

The icon-centering issue (item 1 in the issue) falls out of this: the text slot is never empty while the button is visible, so the icon sits where it should.

## 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)

[kra-mo]

Looks good, but would it not be possible to also just show the same generic icon for settings instead of the a11y/personal icons?

[pringelmann]

Ah yes, good catch. Changed to always use settings icon instead of subsection icon

[jancborchardt]

Looks great! :) Would have also noted the icon but is already fixed, great stuff 👍