[Task]: Improve Database Explorer

[hansva]

What needs to happen?

Some code cleanup and hardening around Database previews

Issue Priority

Priority: 2

Issue Component

Component: Hop Gui

[hansva]

.take-issue

[nadment]

I had started making some improvements, but I hadn't finished task #5376. If any of these ideas inspire you...

[hansva]

I'm not doing anything that fancy at the moment.

• some layout fixes
• sonar fixes
• and some code hardening around the progress monitor and time-outs