[Tapraj-Pathak]

Summary

• Add a permanent thread deletion action to the chat header, with a confirmation modal and fade-out from the recent chats list.
• Add DELETE /api/threads/{threadId} with owner-token authentication and idempotent handling of concurrent or retried deletions.
• Remove thread-linked local records transactionally, including calls, captures, page-chat bindings, and MCP approval/action data. Keep saved pages and detach their source conversation.
• Document deletion behavior and API usage in the README and chat thread guide.

Testing

• Thread deletion and UI tests
• Typecheck and lint
• Production build
• Formatting checks

Note: The repository does not currently have a browser E2E test harness.