Hide the send box of the Fluent theme when hideSendBox is set

[Eugene (OEvgeny)]

The Fluent theme ignores styleOptions.hideSendBox.

Changelog Entry

Fixed

• Fixed the Fluent theme ignoring styleOptions.hideSendBox, in PR #5918, by @OEvgeny

Description

The Fluent theme renders its own send box through sendBoxMiddleware and never read hideSendBox, so the send box, its toolbar, and suggested actions stayed visible. Fluent's primary send box now renders nothing when hideSendBox is true, the same as the default theme.

Specific Changes

• fluent-theme/src/components/sendBox/SendBox.tsx: PrimarySendBox honors hideSendBox
• api/src/StyleOptions.ts: JSDoc for hideSendBox
• fluentTheme/hideSendBox.html (+ .copilot.html): snapshot 1, the message without send box or suggested actions, in Fluent and Copilot variants

• I have added tests and executed them locally
• I have updated CHANGELOG.md
• I have updated documentation

Review Checklist

This section is for contributors to review your work.

• Accessibility reviewed (tab order, content readability, alt text, color contrast)
• Browser and platform compatibilities reviewed
• CSS styles reviewed (minimal rules, no z-index)
• Documents reviewed (docs, samples, live demo)
• Internationalization reviewed (strings, unit formatting)
• package.json and package-lock.json reviewed
• Security reviewed (no data URIs, check for nonce leak)
• Tests reviewed (coverage, legitimacy)

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