Fix incorrect heading levels for Home page section headings

[Copilot]

This PR fixes an accessibility issue where section headings on the Home page were being announced by screen readers as "heading level 1" instead of the appropriate "heading level 2".

Problem

Screen reader users navigating the WinUI 3 Gallery Home page in headings mode experienced incorrect heading level announcements for:

• "Recently visited" section heading
• "Recently added or updated" section heading

These headings were missing proper AutomationProperties.HeadingLevel attributes, causing them to default to level 1, which breaks the document's heading hierarchy.

Solution

Added AutomationProperties.HeadingLevel="Level2" to both TextBlock elements serving as section headings in HomePage.xaml:

<TextBlock
    x:Name="RecentlyVisitedTitle"
    FontSize="16"
    Style="{StaticResource BodyStrongTextBlockStyle}"
    Text="Recently visited"
    AutomationProperties.HeadingLevel="Level2" />

<TextBlock
    Margin="0,12,0,0"
    FontSize="16"
    Style="{StaticResource BodyStrongTextBlockStyle}"
    Text="Recently added or updated"
    AutomationProperties.HeadingLevel="Level2" />

Impact

• Screen readers now correctly announce these headings as "heading level 2"
• Improved accessibility compliance and document structure hierarchy
• Better navigation experience for users with visual impairments
• Follows existing accessibility patterns used throughout the codebase

The changes are minimal and surgical, affecting only the specific elements mentioned in the accessibility issue while maintaining consistency with established patterns in the accessibility sample pages.

Fixes #1955.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• e7bvsblobprodcus348.vsblob.vsassets.io
  • Triggering command: dotnet build WinUIGallery.sln --configuration Debug (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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[Niels Laute (niels9001)]

/azp run