feat: add copy button to assistant messages

[premiumjibles]

Summary

• Adds a copy button below assistant response messages so users can copy the full text to clipboard
• Reuses existing CopyButton component and text extraction pattern from UserMessage.tsx
• Button is hidden on tool-only messages (no text content)

Test plan

• Send a message in chat, verify copy button appears below assistant response
• Click copy button, paste to confirm correct content
• Verify tool-only responses do not show the button
• Verify code blocks still have their own copy buttons

🤖 Generated with Claude Code

Summary by CodeRabbit

• New Features
  • Added a copy button to assistant messages that appears on hover, allowing users to easily copy the full message text to their clipboard.

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Project	Deployment	Actions	Updated (UTC)
shapeshift-agentic	Ready	Preview, Comment	Mar 13, 2026 6:29am

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 5eacf92f-0b80-46a9-8337-c5eb7c18b809

📥 Commits

Reviewing files that changed from the base of the PR and between e96a7d0 and b0d0e62.

📒 Files selected for processing (1)

• apps/agentic-chat/src/components/AssistantMessage.tsx

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📝 Walkthrough

Walkthrough

Modifies AssistantMessage component to aggregate text content from all text parts and display a copy button alongside the final text part. Updates container styling to enable hover-group effects and adjusts memo dependencies accordingly.

Changes

Cohort / File(s)	Summary
Copy Button on Final Text Part apps/agentic-chat/src/components/AssistantMessage.tsx	Aggregates textContent across all text parts, computes lastTextIndex, and conditionally wraps the final text part with a CopyButton. Updates container class for group styling, adds CopyButton import, and adjusts renderedParts memo dependencies.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Poem

🐰 A button that copies with hop and with cheer,
The final text snippet from messages clear,
With group styling magic for hover delight,
We render the copy—oh what a sight! ✨

✨ Finishing Touches

• 📝 Generate docstrings (stacked PR)
• 📝 Generate docstrings (commit on current branch)

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch ss-5109/copy-button-assistant-message

📝 Coding Plan

• Generate coding plan for human review comments

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