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 a0d1551.}

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Note

Low Risk
Small UI and clipboard-only changes in the diff viewer; no auth, persistence, or API surface.

Overview
Adds a copy file path control on each diff file header so users can paste paths into chat without manually selecting text.

DiffFilePathCopyButton copies via the existing clipboard hook and shows anchored success/error toasts. DiffPanel supplies it through a new renderHeaderMetadata slot on AnnotatableCodeView, which forwards that hook into the underlying code view for diff items only.

Anchored copy toast logic is pulled into anchoredCopyToast.ts; MessageCopyButton now uses the same 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.