wrap tab items in lazy component to fix initial tab selection

[kecnry]

Description

This pull request fixes the lack of an initial tab underline on the slider of the viewer/layer menu, by wrapping with a v-lazy component, because that makes perfect sense.

Checklist for package maintainer(s)

This checklist is meant to remind the package maintainer(s) who will review this pull request of some common things to look for. This list is not exhaustive.

• Are two approvals required? Branch protection rule does not check for the second approval. If a second approval is not necessary, please apply the trivial label.
• Do the proposed changes actually accomplish desired goals? Also manually run the affected example notebooks, if necessary.
• Do the proposed changes follow the STScI Style Guides?
• Are tests added/updated as required? If so, do they follow the STScI Style Guides?
• Are docs added/updated as required? If so, do they follow the STScI Style Guides?
• Did the CI pass? If not, are the failures related?
• Is a change log needed? If yes, is it added to CHANGES.rst?
• Is a milestone set? Milestone is only currently required for PRs related to Imviz MVP.
• After merge, any internal documentations need updating (e.g., JIRA, Innerspace)?

[codecov]

Codecov Report

Merging #924 (2fdad54) into main (743e656) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #924   +/-   ##
=======================================
  Coverage   69.24%   69.24%           
=======================================
  Files          68       68           
  Lines        4832     4832           
=======================================
  Hits         3346     3346           
  Misses       1486     1486           

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[javerbukh]

🤯 Nice work!

[ojustino]

This is a good, subtle change. I'm attaching before and after screenshots for posterity's sake.

[rosteen]

Thanks for the screenshots @ojustino , I was wondering what the difference was from reading the description but was being too v-lazy myself to check.