Fix position bugs

[Withalion]

Fixes these minor bugs:

• Fixes elevation available outside local geoid models.
• Adds geoid model info button for internal providers
• Fixes translation for geoid model info bubble

[tomasMizera]

I was thinking that it would be good to show the info icon (which geoid is used) all the time. I think it will now be quite random for users to tell when the icon is visible and when not.

[github-actions]

Pull Request Test Coverage Report for Build 22582649795

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 89 unchanged lines in 4 files lost coverage.
• Overall coverage decreased (-0.1%) to 59.767%

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Files with Coverage Reduction	New Missed Lines	%
mm/core/merginuserauth.cpp	9	68.24%
mm/app/position/positiontransformer.cpp	11	84.96%
mm/core/merginapi.cpp	13	75.07%
mm/app/position/positionkit.cpp	56	67.7%

Totals
Change from base Build 22568885959:	-0.1%
Covered Lines:	8769
Relevant Lines:	14672

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💛 - Coveralls

[Withalion]

We can show the icon all the time, but sometimes we have no clue what model is used to calculate the final value. So, do we want to show something like "Orthometric height, using unknown geoid model"?

[github-actions]

📦 Build Artifacts Ready

OS	Status	Build	Info	Workflow run
macOS Build	📬	Mergin Maps 64391 dmg	Expires: 31/05/2026	#6439
linux Build	📬	Mergin Maps 64501 x86_64	Expires: 31/05/2026	#6450
win64 Build	📬	Mergin Maps 56341 win64	Expires: 31/05/2026	#5634
Android Build	📭	Build not yet complete or failed.
iOS Build	📬		Build number: 26.03.869011	#8690

[github-actions]

📦 Build Artifacts Ready

OS	Status	Build	Info	Workflow run
macOS Build	📬	Mergin Maps 64431 dmg	Expires: 31/05/2026	#6443
linux Build	📭	Build not yet complete or failed.
win64 Build	📬	Mergin Maps 56381 win64	Expires: 31/05/2026	#5638
Android Build	📬	Mergin Maps 775351 APK [arm64-v8a]	Expires: 31/05/2026	#7753
Android Build	📬	Mergin Maps 775311 APK [armeabi-v7a]	Expires: 31/05/2026	#7753
iOS Build	📬		Build number: 26.03.869411	#8694