Support Theme: Improve single topic mobile view (take 2)

[SergeyBiryukov]

Previously: #4203

Single topic mobile view (at 480px or less) has a couple issues:

• The "also viewing" banner has some extra padding at the top.
• The "Plugin Author" badge also has some extra padding on the left and is disconnected from the line it's supposed to be connected to. Might not be a big deal, but when compared to the desktop view, it gives a feeling that something does not look quite right.

See the screenshot for both issues.

[vladytimy]

[related] #2522 has 2552.1.patch that fixes the first issue addressed in this ticket.

[vladytimy]

Removes space between line and badge on mobile devices

[vladytimy]

I couldn't test 5680.1patch with rtl style - that needs some testing.

[coffee2code]

Per dd32 in https://meta.trac.wordpress.org/ticket/2552#comment:24: the first item was fixed in r11568 via JavaScript, due to the recent header changes.

[coffee2code]

In 13383:

Support: Prevent user badge from separating from associated left vertical border at narrow viewports.

Props vladytimy, SergeyBiryukov.
Fixes #5680.

[coffee2code]

In 13426:

wporg-support-2024: Prevent user badge from separating from left edge of container at narrow viewports.

Props vladytimy, SergeyBiryukov.
See #5680.