feat(web): attach selected response text

[darox]

What Changed

Adds response-text annotations to web and desktop chat.

Users can select text from an assistant response, choose Add to chat, and include an optional comment. Pending selections are grouped in a composer chip where they can be reviewed or removed before sending.

Selections are sent as structured prompt context and displayed as a compact annotation summary instead of exposing the serialized markup in the conversation.

Why

Referencing part of an assistant response currently requires manually copying and pasting it into the composer. This makes the excerpt and the user’s instruction harder to distinguish.

Attaching the exact selection keeps that context explicit while leaving the composer and conversation readable.

UI Changes

Before

Selecting text in an assistant response did not provide an action for attaching it to the next message.

After

Selecting response text opens an Add to chat action.

An optional comment can be added to explain why the text is relevant.

Multiple selections are grouped and can be reviewed or removed individually.

Sent messages display a compact annotation summary without showing the underlying prompt markup.

Interaction video

Screen.Recording.2026-08-02.at.1.00.54.PM.mov

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Model: OpenAI Codex · Harness: Codex desktop

Note

Add selected response text attachment to the chat composer

• Users can select text in assistant messages to open a popover (ChatTextSelectionPopover) that lets them add the selection (with an optional comment) to the composer draft as a chat selection annotation.
• Annotations are serialized as XML blocks and appended to the outgoing prompt via appendChatSelectionAnnotationsToPrompt; the composer shows a summary chip (ComposerPendingChatSelectionAnnotations) to review or remove pending annotations before sending.
• The composerDraftStore persists chat selection annotations alongside other draft content (storage version bumped to 9), restores them on send failure, and treats their presence as sendable content.
• User message bubbles in the timeline parse and hide raw annotation markup, displaying a summary chip instead; annotation-only messages suppress the empty bubble.
• Behavioral Change: resolvePlanFollowUpSubmission now stays in plan mode when chat selection annotations are present even if draft text is empty.

^{Macroscope summarized 6163c32.}

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Note

Medium Risk
Touches composer send/rollback, draft persistence, and prompt serialization for outbound messages, but changes are localized to chat UI with tests for round-trip and markup edge cases.

Overview
Adds response-text annotations so users can quote assistant output in the next message without copy-paste.

Selecting text in an assistant markdown response opens an Add to chat popover (optional comment). Pending selections live in the composer as reviewable chips, persist in the draft store (storage version bump), and count toward sendable content and plan follow-up mode.

On send, annotations are appended as structured chat_selection XML blocks marked data-t3code-appended; only app-generated blocks are parsed as annotations—user-authored similar markup stays plain text. The timeline shows a compact N annotation(s) summary instead of raw markup; annotation-only messages skip an empty user bubble. Failed sends and plan follow-ups restore cleared drafts when the composer was not edited mid-flight.

^{Reviewed by Cursor Bugbot for commit 6163c32. Bugbot is set up for automated code reviews on this repo. Configure here.}

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[macroscopeapp]

Approvability

Verdict: Needs human review

This PR introduces a new user-facing feature (attaching selected response text to messages) with new UI components, new state management, and new interaction flows. New features with this scope warrant human review.

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[cursor]

Cursor Bugbot has reviewed your changes using high effort and found 2 potential issues.

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