Add docs for POS > PWC > Switch component

[prakashraman]

Fixes #21064

Background

Add documentation for the Switch component in the Point of Sale surface.

Solution

This PR adds comprehensive documentation for the Switch component in the Point of Sale surface, including:

• Component description and usage guidelines
• Property and event definitions
• Default example showing basic usage with labels
• Event handling example demonstrating how to respond to toggle changes
• Accessibility best practices
• Supporting screenshots for visual reference

The documentation explains that the Switch component creates a toggle control for binary choices that take effect immediately, such as enabling notifications or toggling features.

🎩

• To be tophatted only by the App Platform Team, as the tophatting procedures for individual component additions are tricky at the moment

Checklist

• I have 🎩'd these changes
• I have updated relevant documentation

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[prakashraman]

• Add docs for POS > PWC > Switch component #3659 👈 (View in Graphite)
• 2026-01-rc

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[BrittaEvansFenton]

[Re: line +3]

nit, but switch has a blockish layout so for this to exist like the screenshot we would need a stack aroud these items.

Not a blocker but something we might want to consider

See this comment inline on Graphite.

[prakashraman]

I see your point.

However the sake of readibility (and ease of understanding), I'd vote for not including the s-stack in the example code.