Add startConversation method and missing Messenger/data attributes.

[devrnt]

What

Closes the remaining gaps between react-use-intercom and the official Intercom JavaScript SDK, found
by a full scan of the methods and [attributes/objects](https://developers.intercom.com/installing-int
ercom/web/attributes-objects) docs.

Method

• startConversation(message) — opens the Messenger and immediately starts a new conversation with the supplied message.

Messenger attributes

• linkColor (link_color) — hyperlink color in messages.
• themeMode (theme_mode) — 'light' | 'dark' | 'system'.
• messengerStyleId (messenger_style_id) — load a specific messenger style configuration.
• hideNotifications (hide_notifications) — start with in-app notifications hidden at boot (pairs with the existing hideNotifications runtime method).

Data attribute

• pageTitle (page_title) — page-view tracking label.

Notes

• All additions are optional and backwards-compatible → minor (changeset included).
• Attributes follow the existing camelCase → snake_case mapping in mappers.ts; README continues to defer attribute docs to the IntercomProps types.

Verification

• pnpm build (incl. DTS typecheck) ✓
• pnpm test ✓
• pnpm lint ✓

🤖 Generated with Claude Code

[changeset-bot]

🦋 Changeset detected

Latest commit: 7322d54

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
react-use-intercom	Minor

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[github-actions]

Size Change: 0 B

Total Size: 5.7 kB

ℹ️ View Unchanged

Filename	Size
packages/react-use-intercom/dist/index.cjs	2.93 kB
packages/react-use-intercom/dist/index.js	2.77 kB

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