feat: add copy path button to diff headers

[ipanasenko]

Hey guys!

I find myself in a need to copy a file path from diff view quite often. I use it to paste into the chat and ask questions about this specific file. I think it makes it much more obvious for model (and for me) what file we are talking about.

Currently the best workflow in T3 Code I found for copying file path is to manually select file path and do Cmd+C. I think this can be improved by adding a copy button, GitHub-style.

Summary

• add a copy-path button to diff file headers using the Diffs renderHeaderMetadata slot

Note

Add copy path button to diff file headers

• Adds a new DiffFilePathCopyButton component that copies a file path to the clipboard, with a toggling icon and tooltip indicating copy/copied state.
• Integrates the button into DiffPanel via the renderHeaderMetadata prop on each file diff header.
• Extracts shared anchored toast helpers (showAnchoredCopySuccessToast, showAnchoredCopyErrorToast) into a new anchoredCopyToast.ts module and updates MessageCopyButton to use them.

^{Macroscope summarized ff25a41.}

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Note

Low Risk
UI-only changes that reuse existing clipboard/toast infrastructure; risk is limited to minor regressions in copy/toast behavior and diff header interactions.

Overview
Adds a GitHub-style copy file path control to each diff file header via FileDiff’s renderHeaderMetadata, with tooltip/icon feedback and anchored success/error toasts.

Introduces a shared ui/anchoredCopyToast helper (timeout + success/error toast functions) and refactors MessageCopyButton to use it instead of duplicating toast wiring.

^{Reviewed by Cursor Bugbot for commit ff25a41. Bugbot is set up for automated code reviews on this repo. Configure here.}

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[cursor]

Cursor Bugbot has reviewed your changes and found 3 potential issues.

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^{Reviewed by Cursor Bugbot for commit 558bb17. Configure here.}

[macroscopeapp]

Approvability

Verdict: Needs human review

An unresolved review comment identifies a potential event propagation bug where clicking the copy button may also trigger the parent's file-open action. This interaction issue should be verified by a human reviewer.

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