Feature: reply to selected assistant response text

[piyushpradhan]

Problem

When an assistant response contains a specific passage that needs clarification or correction, the composer has no direct way to preserve that passage as reply context. Users have to copy, paste, and format it manually.

Proposed interaction

On web and desktop, selecting text in an assistant response exposes a small Reply action. Choosing it appends the selected passage to the composer as a Markdown quote so the user can write beneath it and send it through the existing provider flow. The quote remains readable on every client because it is ordinary message content.

Scope

• Web and desktop create the quoted reply.
• Mobile renders the resulting quote but does not add selection UI in this first pass.
• No provider or wire-contract changes are required.

[JDobbsy1987]

Really hope to see this feature soon, it's the one thing holding me back as replying to specific passages appear to be a big part of my workflow, something i didn't realise until i didn't have it.