chore(kno-13491): clarify cross-platform payload overrides for Expo

[cellomatt]

Description

This PR adds guidance on how to handle payload overrides when working with an Expo channel so that custom data will appear under notification.request.content.data regardless of which platform the recipient device uses.

[linear-code]

KNO-13491

[vercel]

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Project	Deployment	Actions	Updated (UTC)
docs	Ready	Preview, Comment	Jun 3, 2026 8:36pm

[cursor]

Risk LOW: Adds a new subsection to the Expo push integration docs clarifying how to structure payload overrides so custom data is accessible on both iOS and Android via expo-notifications.

Reasons

• Only a single .mdx content file is modified (content/integrations/push/expo.mdx)
• Small diff: 22 additions, 0 deletions — well under the 50-line threshold
• No new pages added, no sidebar or navigation changes
• No component, layout, library, style, or config files touched
• No dependencies or build configuration modified

Notes

• Verify the external links to Expo and Firebase docs resolve correctly
• Confirm the Liquid template syntax {{ data.url }} in the JSON code block renders as expected in the docs site

  

_{Sent by Cursor Automation: Docs PR classifier}