fix(ui): freight timeline scroll and overlap

[Marvin9]

Issue Reference

Description

before:

Screen.Recording.2026-05-11.at.4.07.27.PM.mov

after:

Screen.Recording.2026-05-11.at.4.09.15.PM.mov

Checklist

• The PR is linked to an existing issue.
• The linked issue has no blocking labels (kind/proposal,
  needs discussion, needs research, maintainer only, area/security,
  size/large, size/x-large, size/xx-large).
• I have added or updated tests as appropriate.
• I have added or updated documentation as appropriate.

AI Use Disclosure

Select one:

• This PR was written by a human without AI assistance.
• This PR was written by a human with AI assistance. A human has reviewed every line prior to opening the PR.
• This PR was written by an AI with human supervision. A human has reviewed every line prior to opening the PR.
• This PR was written entirely by AI. No human has reviewed this prior to opening the PR.

Sign-Off

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• All commits are cryptographically signed (git commit -S) (encouraged)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.92%. Comparing base (5593414) to head (10d011f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6261   +/-   ##
=======================================
  Coverage   57.92%   57.92%           
=======================================
  Files         496      496           
  Lines       41554    41554           
=======================================
  Hits        24072    24072           
  Misses      16030    16030           
  Partials     1452     1452           

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