v3.19.1

### New features

- 👌 Add a Send Chat Message action to the Blink block. New Blink credentials use App Identities; existing legacy credentials keep working with Get Users and Send Feed Event.
- 👌 Allow multi-line placeholders on long Text inputs.
- 👌 Load Custom OAuth profiles from the OIDC UserInfo endpoint when `CUSTOM_OAUTH_USE_USERINFO` is `true`.

### Fixed

- 🐛 Keep integers above `Number.MAX_SAFE_INTEGER` as strings when guessing variable types.
- 🐛 Use the right typebot ID in WhatsApp media URLs of the first message.
- 🐛 Allow creating several WhatsApp credentials in the same builder session.
- 🐛 Keep large results exports running in the background.
- 🐛 Keep the daily cleanup below transaction timeouts.
- 🐛 Truncate long share links instead of overlapping the Copy button.

### Security

- 🐛 Extend the WhatsApp session restriction to file uploads and restrict WhatsApp credential details to workspace members.

### Maintenance

- 🔧 Deploy the webhook relay with PartyServer and Wrangler, since `partykit deploy` stops working on 2026-10-23. Running relays are unaffected; to redeploy one, follow the [PartyKit configuration](https://docs.typebot.io/self-hosting/configuration#partykit).
- 🔧 Slim the production Builder and Viewer Docker images.
- 🔧 Upgrade TanStack Start, Zod and oRPC.