docs: Add UnoSplashScreenScale SDK property documentation

[Copilot]

Uno.Sdk added UnoSplashScreenScale (maps to Scale metadata on UnoSplashScreen) but it was missing from the Resizetizer docs.

PR Type

• Documentation content changes

What is the current behavior?

UnoSplashScreenFile, UnoSplashScreenBaseSize, and UnoSplashScreenColor are documented under "Utilizing SDK Properties" for splash screens. UnoSplashScreenScale is absent despite being available.

What is the new behavior?

• Added UnoSplashScreenScale to the SDK properties list with a description noting it is overridden by platform-specific scales set directly on the UnoSplashScreen item.
• Updated the accompanying XML example to include the new property:

<PropertyGroup>
    <UnoSplashScreenFile>Assets\SplashScreen\custom_splash_screen.svg</UnoSplashScreenFile>
    <UnoSplashScreenBaseSize>128,128</UnoSplashScreenBaseSize>
    <UnoSplashScreenColor>#512BD4</UnoSplashScreenColor>
    <UnoSplashScreenScale>0.5</UnoSplashScreenScale>
</PropertyGroup>

PR Checklist

Please check if your PR fulfills the following requirements:

• Tested code with current supported SDKs
• Docs have been added/updated which fit documentation template. (for bug fixes / features)
• Unit Tests and/or UI Tests for the changes have been added (for bug fixes / features) (if applicable)
• Wasm UI Tests are not showing unexpected any differences. Validate PR Screenshots Compare Test Run results.
• Contains NO breaking changes
• Updated the Release Notes
• Associated with an issue (GitHub or internal)

Other information

Related to unoplatform/uno#22759 which introduced UnoSplashScreenScale to Uno.Sdk.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Add documentation for UnoSplashScreenScale in Uno.Sdk</issue_title>
<issue_description>Add documentation for newly added property: unoplatform/uno#22759</issue_description>

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

• Fixes Add documentation for UnoSplashScreenScale in Uno.Sdk #362

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