Allow splitting conversations into separate chats by topic

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

Conversations with Claude naturally evolve across multiple topics. When a chat covers several unrelated subjects, the accumulated context becomes noise that affects the relevance of responses. There is no way to isolate a specific thread or clean up off-topic exchanges without starting a new conversation from scratch and losing continuity.

Proposed Solution

Allow users to select a range of messages and extract them into a new chat, preserving only the context relevant to that selection. Ideally accessible via right-click or a message action menu. The original chat would remain intact.

Alternative Solutions

Currently the only workaround is manually copying and pasting relevant messages into a new chat, which is cumbersome and loses formatting and structure.

Priority

Medium - Would be very helpful

Feature Category

Interactive mode (TUI)

Use Case Example

A user starts a conversation about a technical project. Mid-conversation the topic shifts to a creative writing task, then back to technical work. The user wants to extract the creative writing exchange into its own dedicated chat for future reference, without the technical context interfering.

Additional Context

Similar functionality exists in some note-taking tools that allow block extraction. No significant technical constraint is apparent since messages are already discrete units.