Fix Email TextBox truncation at 200% text scaling in accessibility screen reader page

[Copilot]

This PR fixes an accessibility issue where the placeholder text "test@example.com" in the Email TextBox gets truncated when text scaling is set to 200% on the Screen reader support page.

Problem

Users with low vision who rely on text scaling to 200% experienced truncation of the email placeholder text due to a fixed width constraint of 200px on the TextBox control. This violates MAS 1.4.4 – Resize Text accessibility requirements and creates a poor user experience for users who need larger text.

Solution

Changed the Email TextBox from using a fixed Width="200" to MinWidth="200" in AccessibilityScreenReaderPage.xaml. This allows the control to:

• Maintain the intended minimum visual design (200px baseline)
• Expand automatically when text scaling increases beyond 100%
• Prevent text truncation while preserving layout consistency

Changes Made

• Line 121: Width="200" → MinWidth="200" on the Email TextBox
• Line 147: Updated the corresponding XAML code example to reflect the change for consistency

The fix is minimal and surgical, addressing only the specific accessibility issue without affecting other TextBox controls or overall page layout.

Fixes #1960.

Warning

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[marcelwgn]

/azp run