Fix motion slot documentation: replace backdrop={null} with backdropMotion={null}

[Copilot]

The "Disable Motion" story incorrectly demonstrated backdrop={null} (removes backdrop entirely) instead of backdropMotion={null} (disables backdrop animation). Users following the DialogSurface docs link couldn't find examples of disabling motion without removing the backdrop.

Changes

• Example 2: Changed from backdrop={null} to backdropMotion={null} alongside surfaceMotion={null} to show disabling all motion while preserving the backdrop
• Example 3 (new): Isolated backdropMotion={null} example showing backdrop animation disabled with surface animation intact
• Description: Explicitly names motion slots and parent components (surfaceMotion on Dialog, backdropMotion on DialogSurface)

Examples now demonstrate

// Example 1: Disable surface scale only
<Dialog surfaceMotion={null}>
  <DialogSurface>...</DialogSurface>
</Dialog>

// Example 2: Disable all motion, backdrop still rendered
<Dialog surfaceMotion={null}>
  <DialogSurface backdropMotion={null}>...</DialogSurface>
</Dialog>

// Example 3: Disable backdrop fade only
<Dialog>
  <DialogSurface backdropMotion={null}>...</DialogSurface>
</Dialog>

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• storybook.js.org
  • Triggering command: /opt/hostedtoolcache/node/22.22.0/x64/bin/node /opt/hostedtoolcache/node/22.22.0/x64/bin/node /home/REDACTED/work/fluentui/fluentui/node_modules/.bin/storybook dev (dns block)

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• 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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Related Issue(s)

• Fixes [Docs]: Disabling motion in the Dialog component #34484

[github-actions]

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