Fix accessibility: Associate Tags label with TagsItemsView for screen readers

[Copilot]

This PR fixes an accessibility issue in the Iconography page where the "Tags" label was not properly associated with the list of tag items for screen readers.

Problem

When using screen readers like Narrator, users navigating to the tag items in the Iconography page would only hear the individual tag names without any context about the group they belong to. This violated WCAG 1.3.1 - Info and Relationships and created confusion for users with visual impairments.

Solution

Added proper AutomationProperties to establish the label-control relationship:

<TextBlock
    x:Name="TagsLabel"
    Text="Tags" />
<ItemsView
    x:Name="TagsItemsView"
    AutomationProperties.LabeledBy="{x:Bind TagsLabel}"
    ItemsSource="{x:Bind SelectedItem.Tags, Mode=OneWay}">

Technical Details

• Minimal change: Only 2 lines added to the existing XAML
• Follows existing patterns: Uses the same approach as AccessibilityScreenReaderPage.xaml
• No visual impact: Pure accessibility improvement with no changes to UI appearance or functionality
• Screen reader improvement: Narrator will now announce "Tags" when entering/exiting the group of tag items

Testing

The fix follows established accessibility patterns in the codebase and addresses the specific MAS 1.3.1 compliance requirement mentioned in the issue.

Fixes #1966.

Warning

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[Niels Laute (niels9001)]

Tested, works well!

[Marcel W. (marcelwgn)]

/azp run