Fix accessibility: Add proper AutomationProperties.Name to Sound page buttons

[Copilot]

The buttons under "Play Specific System Sound" heading were announcing inappropriate names to screen readers. When users navigated to these buttons, Narrator was announcing "Right pointing black triangle shape, Focus, button" instead of the expected "Focus, button".

Root Cause

The buttons used Unicode triangle character (▶) in their Content property:

<Button Content="&#x25B6; Focus" Tag="0" />

Screen readers interpret this Unicode character as "Right pointing black triangle shape", which creates a poor user experience for visually impaired users.

Solution

Added AutomationProperties.Name to each of the 7 buttons with clean, descriptive names:

<Button 
    Content="&#x25B6; Focus" 
    Tag="0" 
    AutomationProperties.Name="Focus" />

This change ensures that:

• Screen readers announce clean button names (e.g., "Focus, button")
• Visual appearance remains unchanged for sighted users (triangle symbol still visible)
• All button functionality is preserved

Impact

• Accessibility: Major improvement for users relying on screen readers
• Visual: No change - buttons look exactly the same
• Functional: No change - all button click handlers work identically
• Compliance: Meets MAS 4.2.1 – Object Information requirements

The fix affects all 7 sound control buttons: Focus, Invoke, Show, Hide, MovePrevious, MoveNext, and GoBack.

Fixes #1968.

Warning

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[Niels Laute (niels9001)]

Tested, the right name is announced

[Niels Laute (niels9001)]

/azp run