Fixes #536 watermark position independent from scales

[pchelle]

As suggested in this ggplot2 PR

[pchelle]

@KatrinCoboeken is this already accounted for in {opsuite.plots} ?

[pchelle]

@KatrinCoboeken is this already accounted for in {opsuite.plots} ?

I checked, you actually use geom_text so the fix is not relevant for the {opsuite.plots} package

[Felixmil]

Snapshots need to be updated too.

[KatrinCoboeken]

Yes, in {ospsuite.plots} I also had to update the watermark feature with ggplot2 version 4. But it is done.

[Felixmil]

Plots look the same, the changes are svg "internal". All good.

[Felixmil]

Should we expect plot changes in other packages ?

[codecov-commenter]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 84.24%. Comparing base (ad57bbb) to head (511f078).
⚠️ Report is 4 commits behind head on develop.

Files with missing lines	Patch %	Lines
R/utilities-background.R	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           develop     #537       +/-   ##
============================================
+ Coverage    71.26%   84.24%   +12.98%     
============================================
  Files           63       63               
  Lines         4326    11033     +6707     
============================================
+ Hits          3083     9295     +6212     
- Misses        1243     1738      +495     

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[pchelle]

Should we expect plot changes in other packages ?

This update should not change the plots in other packages.
Before the ggplot2 v4, annotation_custom() was not sensitive to scales functions, using this PR it simply remains unsensitive to scales functions

[Copilot]

Pull Request Overview

This PR fixes issue #536 by making watermark positioning independent from plot scales, following the approach suggested in ggplot2 PR #6182. The fix wraps the infinite boundary values with I() to prevent them from being affected by scale transformations.

Key Changes:

• Wrapped annotation_custom() boundary parameters with I() to ensure scale-independent positioning
• Fixed a typo in layer access (layer → layers)

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