feat: extract roomId from email text before checking headers

[sweetmantech]

Summary

• Primary check now looks for Recoup chat link in email body text: https://chat.recoupable.com/chat/{uuid}
• Falls back to references header lookup if not found in text
• Fixed: Convert stored UI parts to ModelMessage format for AI SDK compatibility

Problem

1. When a user replies to an email from Recoup, the email footer contains the chat link. We should extract the roomId from this link first, as it's more reliable than the references header.
2. The stored memories contain UI-specific part types (step-start, dynamic-tool, reasoning with state) that don't match the ModelMessage[] schema the AI SDK expects, causing AI_InvalidPromptError.

Solution

1. Added extractRoomIdFromText() helper that uses regex to find the UUID from the chat link pattern.
2. Refactored getEmailRoomMessages() to convert UI parts to simple text-based ModelMessages, extracting only the text content from user and assistant messages.

🤖 Generated with Claude Code

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Project	Deployment	Review	Updated (UTC)
recoup-api	Ready	Preview	Jan 8, 2026 3:47pm

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