Store graph viewport in client local storage

[Frizi]

Pull Request Description

Fixes #6250

With this change, I've also slightly refactored the graph editor component by grouping related functionality into neat block and moving already loosely coupled groups to separate files. Further work will be needed to simplify it, but it is a good first step.

viewport-save.mp4

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.

[farmaazon]

❤️