feat(tui): add /edit slash command to open changed files in $EDITOR

[joeyism]

Issue for this PR

Closes #17643

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

When the user runs /edit, it opens up all the files edited in this opencode session in $EDITOR editor

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How did you verify your code works?

I tested it locally. See recording below

Screenshots / recordings

opencode-edit-2026-03-15_12.05.56.mp4

If this is a UI change, please include a screenshot or recording.

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

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[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Based on the search results, I found one potentially related PR:

Related PR:

• PR feat(tui): add /edit-last command to open last assistant message in editor #11595: feat(tui): add /edit-last command to open last assistant message in editor
  • feat(tui): add /edit-last command to open last assistant message in editor #11595
  • This PR implements a similar /edit command but for opening the last assistant message in an editor, rather than opening changed files. Both use the $EDITOR environment variable and relate to editor integration in the TUI.

The current PR (17644) adds /edit to open changed files, while PR #11595 adds /edit-last to open the last assistant message. These are complementary features rather than duplicates, but they're related in implementation and purpose.

[joeyism]

This PR doesn't fully meet our contributing guidelines and PR template.

What needs to be fixed:

• No "Type of change" checkbox is checked. Please select at least one.
• Not all checklist items are checked. Please confirm you have tested locally and have not included unrelated changes.

Please edit this PR description to address the above within 2 hours, or it will be automatically closed.

If you believe this was flagged incorrectly, please let a maintainer know.

fixed. Sorry malformed markdown

[joeyism]

The following comment was made by an LLM, it may be inaccurate:

Based on the search results, I found one potentially related PR:

Related PR:

• PR feat(tui): add /edit-last command to open last assistant message in editor #11595: feat(tui): add /edit-last command to open last assistant message in editor

  • feat(tui): add /edit-last command to open last assistant message in editor #11595
  • This PR implements a similar /edit command but for opening the last assistant message in an editor, rather than opening changed files. Both use the $EDITOR environment variable and relate to editor integration in the TUI.

The current PR (17644) adds /edit to open changed files, while PR #11595 adds /edit-last to open the last assistant message. These are complementary features rather than duplicates, but they're related in implementation and purpose.

I think that's different. This PR is to edit actual files that's been modified in this session. The cited PR is for editing last assistant message

[github-actions]

Thanks for updating your PR! It now meets our contributing guidelines. 👍