[FEATURE]: Add "copy file path" action to diff review and file viewer

[agustinzamar]

Feature hasn't been suggested before.

• I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

Summary

Add an action to copy the file name, path, or relative path directly from the git diff review and file viewer panels of the new UI.

Motivation

Right now, when reviewing a diff or browsing a file, there's no quick way to grab the file's path. Users have to manually locate the file in a file explorer or reconstruct the path by hand, which slows down workflows like:

• Referencing a file in a commit message, PR description, or Slack/chat message.
• Pasting a path into a terminal command (cat, code, git blame, etc.).
• Sharing a file location with a teammate or an AI assistant.

Proposed behavior

Add a copy action in both:

1. Diff review view: right-click context menu on the file name
2. File viewer: right-click context menu on the file tab.

The action should offer at least one of the following formats:

• File name only — e.g. Component.tsx
• Relative path — e.g. src/components/Component.tsx
• Full/absolute path — e.g. /home/user/project/src/components/Component.tsx

Nice to have

• Keyboard shortcut to copy the relative path of the currently focused file.
• Visual confirmation (toast/tooltip) when the path is copied, e.g. "Copied to clipboard".

Willingness to contribute

Happy to submit a PR for this if there's consensus on the approach / a maintainer gives the go-ahead on the general direction.

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• [FEATURE]:Copy File or Directory Path from File Tree - OpenCode desktop application #16019: Copy File or Directory Path from File Tree (same core request for copying file paths from the UI)
• [FEATURE]: Add right-click context menu to File Explorer panel (Copy Path, Rename, Delete, etc.) #26918: Add right-click context menu to File Explorer panel (Copy Path, Rename, Delete, etc.) — overlapping scope
• [FEATURE]: Desktop: add copy path + open/reveal actions in file/folder context menus #14784: Desktop: add copy path + open/reveal actions in file/folder context menus — very similar request

If your request specifically targets the diff review and file viewer panels (rather than the file tree), it may still be distinct enough to keep open — please clarify in the issue or cross-reference these.

[agustinzamar]

I consider this request is not a duplicate of any of the mentioned by copilot as those focus on the file explorer / file tree view. Although, all of these are complementary and could probably be addressed together with a common solution.