Add MM (millimeters) as a global unit option in the report designer

[Copilot]

The designer's global units setting only offered Inches and Cm — no way to work in millimeters.

Changes

UI (DialogToolOptions)

• Added radioButtonMm radio button to the "Options for Ruler" group box (expanded height to fit)
• InitDesktop() selects the MM button when config contains units = mm
• DoApply() sets MeasureUnits = "mm" when MM is selected
• HandleDesktop() persists "mm" to config XML

Ruler drawing (DesignRuler)

• _IsMetric now also triggers for "mm"
• Scale factor uses DPI / 25.4 for mm vs DPI / 2.54 for cm — applied in both horizontal and vertical ruler paths

Status bar (RdlDesigner)

• IsMetric() returns true for both "cm" and "mm"
• New IsMm() helper distinguishes mm from cm for conversion factor selection
• Position/dimension display applies × 25.4 for mm vs × 2.54 for cm

Resources

• Added RdlDesigner_Status_mm string ("mm") to Strings.resx / Strings.Designer.cs

Warning

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• av-build-tel-api-v1.avaloniaui.net
  • Triggering command: /usr/share/dotnet/dotnet dotnet exec --runtimeconfig /home/REDACTED/.nuget/packages/avalonia.buildservices/11.3.2/tools/netstandard2.0/runtimeconfig.json /home/REDACTED/.nuget/packages/avalonia.buildservices/11.3.2/tools/netstandard2.0/Avalonia.BuildServices.Collector.dll (dns block)

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Original prompt

---

This section details on the original issue you should resolve

<issue_title>Cannot set global units to MM</issue_title>
<issue_description>Is your feature request related to a problem? Please describe.
Need a posibility to set. Global Units
Describe the solution you'd like
A clear and concise description of what you want to happen.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.
</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Cannot set global units to MM #266

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