Add safe in-app updater

[PrimeBuild-pc]

Summary

Describe what changed and why.

Type of Change

• Bug fix
• Feature
• Refactor
• Documentation
• Security hardening
• Performance improvement

Validation

• Built Debug and Release successfully
• Ran automated tests
• Verified impacted UI flows
• Verified no secrets/credentials introduced

Security and Risk Notes

List any impact on elevation, process control, power plan operations, or persisted configuration.

Checklist

• Updated docs where relevant
• Added or updated tests where relevant
• Kept changes scoped and backwards compatible where possible

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Codecov Report

❌ Patch coverage is 47.64826% with 256 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
ViewModels/SettingsViewModel.cs	17.39%	54 Missing and 3 partials ⚠️
Services/UpdateService.cs	65.78%	13 Missing and 13 partials ⚠️
Services/UpdateInstallerService.cs	0.00%	23 Missing ⚠️
Services/SemanticVersion.cs	56.52%	12 Missing and 8 partials ⚠️
Services/AuthenticodeSignatureVerifier.cs	0.00%	19 Missing ⚠️
Services/UpdateChecksumVerifier.cs	42.30%	7 Missing and 8 partials ⚠️
Services/HttpUpdateDownloadClient.cs	0.00%	14 Missing ⚠️
Services/UpdateAssetSelector.cs	48.14%	6 Missing and 8 partials ⚠️
Services/UpdateDownloadService.cs	72.54%	6 Missing and 8 partials ⚠️
Services/ApplicationVersionProvider.cs	0.00%	12 Missing ⚠️
... and 9 more

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