Fix accessibility: Add HeadingLevel markup to page titles for screen reader support

[Copilot]

This PR addresses an accessibility issue where page titles throughout the WinUI 3 Gallery application were not properly marked as headings for screen readers. Previously, visually apparent headings like "WinUI 3 Gallery" were announced as normal text instead of "WinUI 3 Gallery, heading level1", making navigation difficult for users who rely on assistive technologies.

Changes Made

Added AutomationProperties.HeadingLevel="Level1" to all main page title TextBlocks across the application:

• HomePageHeader.xaml - Main "WinUI 3 Gallery" title on the home page
• PageHeader.xaml - Individual control/sample page titles (e.g., "Button", "ListView", etc.)
• AllControlsPage.xaml - "All" section page title
• SectionPage.xaml - Category section page titles (e.g., "Basic Input", "Collections")
• SettingsPage.xaml - "Settings" page title

Impact

• Screen readers now properly announce page titles as headings with appropriate level
• Users can navigate between major page sections using H/Shift+H keyboard shortcuts
• Meets WCAG accessibility standards for programmatic heading identification
• Improves experience for users who rely on screen readers like Narrator

Technical Details

This is a minimal, surgical fix that adds only the necessary accessibility markup without changing any existing functionality. The changes are compatible with the existing accessibility test infrastructure that uses Axe.Windows.Automation for validation.

Fixes #1954, #1224

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 restore WinUIGallery.sln (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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[Marcel W. (marcelwgn)]

/azp run

[Marcel W. (marcelwgn)]

/azp run