Add 'Points' as a unit of measure in Screen Ruler

[ThanhNguyxn]

Summary of the Pull Request

This PR adds "Points" (pt) as a new measurement unit option in Screen Ruler, addressing the feature request in #39464.

Points are a standard unit in typography and design, where 1 point = 1/72 inch. This is particularly useful for developers working with WPF/XAML measurements, font sizes, and design specifications.

PR Checklist

• [x] Closes: #39464
• [x] Communication: I've discussed this with core contributors already. If work hasn't been agreed, this may be closed
• [x] Tests: Added/Passed
• [x] Accessibility: Ensured accessibility standards are met
• [x] Documentation: Added documentation if needed
• [x] Localization: Localized resource strings added

Detailed Description of the Pull Request / Additional comments

Changes Made:

1. Measurement.h

   • Added Point = 16 to the Measurement::Unit enum
   • Increased abbreviations array size from 4 to 5

2. Measurement.cpp

   • Added Point conversion logic:
     • With physical DPI: pixels * px2mmRatio / 10.0f / 2.54f * 72.0f
     • Without physical DPI: pixels / 96.0f * 72.0f (assumes 96 DPI)
   • Added Point case to GetUnitFromIndex() (index 4)
   • Added Point abbreviation loading in InitResources()
   • Added Point case to GetUnitAbbreviation()
   • Added Point to allUnits array for Print function

3. MeasureToolUI Resources.resw

   • Added MeasurementUnitAbbrPoint with value "pt"

4. MeasureToolPage.xaml

   • Added new ComboBoxItem for Points option

5. Settings.UI Resources.resw

   • Added MeasureTool_UnitsOfMeasure_Points.Content with value "Points"

Validation:

The implementation follows the existing patterns for other measurement units (Pixels, Inches, Centimeters, Millimeters) and maintains consistency with the codebase.

[ThanhNguyxn]

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