docs(session): explain indefinite native session fields

[SarahSoutoul]

Description

Document how indefinite native sessions appear in the generated frontend and backend Session property tables. The frontend Date fields represent Unix epoch zero, while the backend numeric fields contain 0. Both now link to the Native sessions guide, and the frontend table retains the hasMaximumLifetime explanation from #9871.

This PR builds on #9871. The corresponding guide changes are in clerk/clerk#3422. To inspect the output, run pnpm typedoc:generate:skip-build and review .typedoc/docs/shared/session-resource/properties.mdx and .typedoc/docs/backend/session.mdx.

Checklist

• pnpm test runs as expected.
• pnpm build runs as expected.
• (If applicable) JSDoc comments have been added or updated for any package exports
• (If applicable) Documentation has been updated

Type of change

• 🐛 Bug fix
• 🌟 New feature
• 🔨 Breaking change
• 📖 Refactoring / dependency upgrade / documentation
• other:

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Project	Deployment	Actions	Updated
clerk-js-sandbox	Ready	Preview	Oct 16, 2026 12:16am UTC
swingset	Building	Preview	Oct 16, 2026 12:16am UTC

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Latest commit: 3267be7

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