docs: update advanced-imessage-ts documentation for v0.12.0

[photon-action-bot]

Documentation Update: advanced-imessage-ts v0.12.0

This PR updates documentation for advanced-imessage-ts based on the v0.12.0 release.

Release Notes

New Features

• Added an optional onHeartbeat client hook for subscribeEvents and watch streams, so apps can tell when the server is still alive even when no messages or updates are coming in.
• Added channelOptions to createClient, plus exported HeartbeatHandler and GrpcChannelOptions types, so advanced users can tune gRPC behavior directly.

Bug Fixes

• gRPC clients now use keepalive pings by default, which helps detect half-open connections instead of letting event streams hang forever. 🫀

Improvement

• Heartbeat handling now works consistently across message, chat, group, poll, and shared-location streams.

---

Version: 0.12.0

---

🤖 This PR was auto-generated by Claude Code via the update-docs action in buildspace.

---

^{Need help on this PR? Tag /codesmith with what you need. Autofix is disabled.}

[mintlify]

Preview deployment for your docs. Learn more about Mintlify Previews.

Project	Status	Preview	Updated (UTC)
Photon	🟡 Building	–	Jun 24, 2026, 8:05 AM

💡 Tip: Enable Workflows to automatically generate PRs for you.