fix: recalculate labelAlign and labelBaseline after repositioning dual axes

[datananda]

Fixes #3773

When parseLayerAxes() repositions a second axis to the opposite orient, labelAlign and labelBaseline (already computed for the original orient) were stale. Resolve labelAngle from all sources (axis or config) using getLabelAngle (matching parseAxis), then recompute both properties for the new orient.

Using the example from the reported issue:

before (config labelAngle 0)

after

PR Description

Checklist

• This PR is atomic (i.e., it fixes one issue at a time).
• The title is a concise semantic commit message (e.g. "fix: correctly handle undefined properties").
• npm test runs successfully
• For new features:
  • Has unit tests.
  • Has documentation under site/docs/ + examples.

Tips:

• https://medium.com/@greenberg/writing-pull-requests-your-coworkers-might-enjoy-reading-9d0307e93da3 is a nice article about writing a nice PR.
• Use draft PR for work in progress PRs / when you want early feedback (https://github.blog/2019-02-14-introducing-draft-pull-requests/).