unify layer-name parsing

[codecov[bot]]

Codecov Report

Attention: 140 lines in your changes are missing coverage. Please review.

Comparison is base (eb146e9) 76.14% compared to head (30e4a96) 76.21%.

Files	Patch %	Lines
eomaps/layout_editor.py	79.15%	119 Missing :warning:
eomaps/helpers.py	81.81%	14 Missing :warning:
eomaps/eomaps.py	62.50%	6 Missing :warning:
eomaps/_webmap.py	66.66%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #223 +/- ## ========================================== + Coverage 76.14% 76.21% +0.06% ========================================== Files 23 24 +1 Lines 11199 11207 +8 ========================================== + Hits 8528 8541 +13 + Misses 2671 2666 -5 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.