Added value map dropdown + search capabilities + preselection

[tomasMizera]

• Added value map dropdown + integrated the value map model
• Added search for value map and unique value dropdowns
• Added KeyRole to value relation model in order to allow preselection of entries in the dropdown

[github-actions]

Coverage Report for CI Build 24213167644

Coverage increased (+0.03%) to 58.555%

Details

• Coverage increased (+0.03%) from the base build.
• Patch coverage: No coverable lines changed in this PR.
• 56 coverage regressions across 5 files.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

56 previously-covered lines in 5 files lost coverage.

File	Lines Losing Coverage	Coverage
mm/app/valuerelationfeaturesmodel.cpp	31	71.67%
mm/app/filter/valuemapfiltermodel.cpp	16	0.0%
mm/app/projectsmodel.cpp	5	69.44%
mm/core/merginapi.cpp	3	75.07%
mm/app/filter/valuemapfiltermodel.h	1	50.0%

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Coverage Stats

Relevant Lines:	15032
Covered Lines:	8802
Line Coverage:	58.56%
Coverage Strength:	101.24 hits per line

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💛 - Coveralls

[github-actions]

📦 Build Artifacts Ready

OS	Status	Build	Info	Workflow run
macOS Build	❌	Build failed or not found.		#6680
linux Build	📬	Mergin Maps 66911 x86_64	Expires: 08/07/2026	#6691
win64 Build	📬	Mergin Maps 58751 win64	Expires: 08/07/2026	#5875
Android Build	📬	Mergin Maps 799251 APK [arm64-v8a]	Expires: 08/07/2026	#7992
	📬	Mergin Maps 799251 APK [arm64-v8a]	Google Play Store	#7992
Android Build	📬	Mergin Maps 799211 APK [armeabi-v7a]	Expires: 08/07/2026	#7992
	📬	Mergin Maps 799211 APK [armeabi-v7a]	Google Play Store	#7992
iOS Build	📬		Build number: 26.04.893111	#8931