feat(files): implement breakpoint improvements

[joj0r]

• Resolves: Breakpoint improvements #53991

Summary

• Added a breakpoint for the + New button to turn into just +. Dependent on the approval of feat(button): Added option to not have label on New button nextcloud-libraries/nextcloud-upload#1831.
• Removed the breakpoint that hides the grid/list view button on smaller screens.

Larger screens >= 512px:

Smaller screens <= 511px:

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)

[susnux]

TODO

• Merge and release feat(button): Added option to not have label on New button nextcloud-libraries/nextcloud-upload#1831

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[skjnldsv]

Node needs compiling. The rest of the tests won't work on forks anyway :)

[skjnldsv]

@susnux you ok with this now ?

[skjnldsv]

Merged in #54561 for CI purposes

[skjnldsv]

Thank you @joj0r !