fix: Connector line position in tree view

[cansuaa]

Description

Take connector line's width into account while calculating its position for a more correct placement

Related links, issue #, if available: n/a

How has this been tested?

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.12%. Comparing base (7db92cc) to head (7e2f043).
⚠️ Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4062      +/-   ##
==========================================
+ Coverage   96.99%   97.12%   +0.12%     
==========================================
  Files         862      863       +1     
  Lines       25223    25295      +72     
  Branches     9108     9120      +12     
==========================================
+ Hits        24466    24567     +101     
+ Misses        710      681      -29     
  Partials       47       47              

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