Small fixes for GUI2

[vitvakatu]

Pull Request Description

Includes the following fixes:

1. Closes Adjust dropdown widget to match Figma design. #8472
   Adding animation when hovering entries, align them to the left, improve vertical alignment, make sure the currently selected entry is marked with rounded background shape.

fixed-dropdown.mp4

2. Backspace is now used on MacOS for deleting nodes, instead of awkward combination Fn+Backspace.
3. Fixed layout for vector editor.

Before:

After:

Also includes the fix for dynamic dropdowns from #8474. Closes #8473

Checklist

Please ensure that the following checklist has been satisfied before submitting the PR:

• The documentation has been updated, if necessary.
• Screenshots/screencasts have been attached, if there are any visual changes. For interactive or animated visual changes, a screencast is preferred.
• All code follows the
  Scala,
  Java,
  and
  Rust
  style guides. In case you are using a language not listed above, follow the Rust style guide.
• All code has been tested:
  • Unit tests have been written where possible.
  • If GUI codebase was changed, the GUI was tested when built using ./run ide build.