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 DiffFilePathCopyButton component that copies a file path to the clipboard, toggling between Copy and Check icons and updating its tooltip to reflect copy state.
• Integrates the button into DiffPanel by passing it as renderHeaderMetadata to AnnotatableCodeView, which renders it in the header of each file diff.
• Extracts shared anchored toast helpers (showAnchoredCopySuccessToast, showAnchoredCopyErrorToast, ANCHORED_COPY_TOAST_TIMEOUT_MS) into anchoredCopyToast.ts and updates MessageCopyButton to use them.

^{Macroscope summarized d701d82.}

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Note

Low Risk
Small UI-only change with clipboard feedback; no auth, data, or API impact.

Overview
Adds a copy path control on each diff file header so users can copy the resolved file path in one click (GitHub-style), with tooltip feedback and anchored success/error toasts.

AnnotatableCodeView gains a required renderHeaderMetadata callback that is forwarded to Pierre Diffs’ CodeView header slot; DiffPanel supplies DiffFilePathCopyButton with resolveFileDiffPath(fileDiff). Anchored copy toast behavior is centralized in anchoredCopyToast.ts, and MessageCopyButton is updated to use those helpers instead of inline toast code.

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[macroscopeapp]

Approvability

Verdict: Approved

Simple UI addition that adds a copy-path button to diff headers. Uses existing hooks and components, with a clean refactor of duplicate toast logic into a shared utility. Self-contained with no complex runtime behavior changes.

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Dismissing prior approval to re-evaluate b028ddf

[juliusmarminge]

I'd left align them after the path, like Github:

[ipanasenko]

From what I see, to achieve this we'd need to use renderCustomHeader prop, and construct whole header manually. Are you okay with that?
Or am I missing something in diffs docs? 👀

Dismissing prior approval to re-evaluate a29ebac

Dismissing prior approval to re-evaluate d701d82

[juliusmarminge]

you can patch in a slot for it? they'll add it soon:

[juliusmarminge]

nvm should already exist:

[ipanasenko]

So, metadata slot is exactly what I used, and it rendered copy button at the very end 🤷‍♂️

Need something like postfix/suffix slot to be able to place button right after the path.