[stable34] feat(core): app menu polish for NC34

[pringelmann]

Summary

Two follow-ups to #60180:

• Grid padding moves to the popover wrapper so the top-row hover sits inside the rounded corner.
• Admin pages (Settings, Apps, Accounts, Help) showed an empty current-app slot. Those entries register as type=settings so they're excluded from the apps initial state. Falls back to settingsNavEntries when no app is active. Logout filtered out defensively.

Preview link

Aria-label includes the section name so screen readers match the visible text, and settings icons are force-whitened since they ship dark and would otherwise be invisible on the themed header.

Three unit tests cover the fallback path.

Also attempted to unify the two triggers visually. Three approaches, none clean enough before freeze. Parking for a post-NC34 design pass.

Checklist

• Code is properly formatted
• Sign-off on all commits
• Unit tests included
• Screenshots before/after below
• Documentation has been updated or is not required
• Backports requested where applicable
• Labels added where applicable
• Milestone added for target branch

[kra-mo]

The padding actually looks worse now, since scrolling clips:

What I meant with my previous comment on padding was that, when hovered, it would be nice if these would be identical:

And the way to achieve that would be to increase the top padding of each item in the top row. I can also let go of this request if it would be too messy to do, it's just a small thing.

The colors also seem to be broken on the preview, I'm not sure what causes that, or whether it's relevant.

[susnux]

The colors also seem to be broken on the preview, I'm not sure what causes that, or whether it's relevant.

Also wonder where the icons coming from, e.g. the app icon for activity is a lightning not a key.

[pringelmann]

@kra-mo I had to reset my local env, so I didn't test scrolling behavior before opening PR. Will make sure to check the preview env next time!

Yeah it's a small thing but I feel its important to get the small details right on such a fundamental element change, so I fixed it. Please check the preview link again.

The dark/colored icons are from fake apps that I installed to quickly populate the menu. I've colored the icons correctly.

[kra-mo]

Wonderful! Thank you :)

[pringelmann]

/backport to stable34