viewer toolbar: align to right

[kecnry]

Description

This pull request moves the alignment of the "hammer and screwdriver" toolbar to the right and the child "save" menu to the left so it does not overflow past the far right of the viewer.

Fixes #659

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 #901 (c5c6888) into main (34df475) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #901   +/-   ##
=======================================
  Coverage   68.38%   68.38%           
=======================================
  Files          66       66           
  Lines        4799     4799           
=======================================
  Hits         3282     3282           
  Misses       1517     1517           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 0b28cfd...c5c6888. Read the comment docs.

[pllim]

Definitely feels more intuitive. Thanks!

p.s. Not sure what the "child save menu" is.

Before

After

[kecnry]

p.s. Not sure what the "child save menu" is.

The menu with "save as png" and "save as svg" that pops up if you click on the save icon. It used to extend to the right of the save icon, but that would now overflow past the edge of the viewer (if there are multiple viewers like in Cubeviz). I changed that to always extend to the left so it doesn't overflow.

With that change (as is in the PR):

Without that change:

[pllim]

Ah! I obviously never try to click that button. 😆

Looks nice. Would approve again! -- ⭐⭐⭐⭐⭐

[javerbukh]

Great change, thank you!