feat: extend hover copy button to tool results and intermediate AI text

[AgarwalPragy]

Two more surfaces benefit from the same hover CopyButton pattern that bff0910 added to LastOutputDisplay's text variant:

• LastOutputDisplay tool_result block: inline CopyButton in the header
• TextItem: copyable on MarkdownViewer, matching ThinkingItem

Validation

• pnpm typecheck, pnpm test (722/722), pnpm lint:fix, pnpm build — all pass
• Manually verified in dev

Summary by CodeRabbit

• New Features

  • Markdown content is now copyable.

• Style

  • Copy button for tool results repositioned for improved accessibility.

[gemini-code-assist]

Code Review

This pull request enhances the chat interface by adding copy functionality to key components. It introduces a CopyButton to the LastOutputDisplay for tool results and enables the copyable prop on the MarkdownViewer within TextItem. As there are no review comments to evaluate, I have no further feedback to provide.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: e01ccd05-81d0-441c-bd4f-1b1baf727eb4

📥 Commits

Reviewing files that changed from the base of the PR and between 16cc3c8 and a08576d.

📒 Files selected for processing (2)

• src/renderer/components/chat/LastOutputDisplay.tsx
• src/renderer/components/chat/items/TextItem.tsx

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📝 Walkthrough

Walkthrough

This PR adds copy-to-clipboard enhancements to two chat UI components. The tool result display now right-aligns its copy button in the header row, and the text item component enables inline copying for markdown content via the copyable prop.

Changes

Copy functionality enhancements

Layer / File(s)	Summary
Tool result copy button positioning src/renderer/components/chat/LastOutputDisplay.tsx	The CopyButton for lastOutput.toolResult is wrapped in a right-aligned container (ml-auto), positioning the copy control at the end of the tool-result header row.
Markdown content copy enablement src/renderer/components/chat/items/TextItem.tsx	TextItem passes the copyable prop to MarkdownViewer, enabling users to copy displayed markdown content.

Possibly related PRs

• matt1398/claude-devtools#182: Modifies LastOutputDisplay.tsx to adjust CopyButton behavior and positioning in the last-output UI.
• matt1398/claude-devtools#145: Modifies markdown/copy-to-clipboard UI in chat components, adjusting where the copy button appears and how copying behaves.

Suggested labels

feature request

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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