Bugfix/recursivetreeview issue after changing nodes

[KaiStarkk]

Draft

Description

This adds tests for a bug identified in #2875 . This adds 4 new tests for RecursiveTreeView which isolates the issue to one specific test, the other 3 pass.

I've submitted this PR as draft since the tests are useful, but this isn't yet a fix. Will work on it shortly.

Checklist

Please read and apply all contribution requirements.

• [x] This PR targets the dev branch (NEVER master)
• [x] Documentation reflects all relevant changes
• [x] Branch is prefixed with: docs/, feat/, chore/, bugfix/
• [x] Ensure Svelte and Typescript linting is current - run pnpm ci:check
• [x] Ensure Prettier linting is current - run pnpm format ^ This caused an unrelated edit which has been added as a separate commit
• [ ] All test cases are passing - run pnpm test ^ There were already failing tests on dev
• [x] Includes a changeset (if relevant; see above)