feat(source-control): add hover button to open a changed file for editing

[wang-mingxue]

What

Add a one-click hover button on each changed-file row in the Source Control panel that opens the editable file (not the read-only diff).

Why

Clicking a changed file opens the read-only diff view. Opening the actual editable file was only reachable via the right-click → "Open File" context-menu item, which is easy to miss. This surfaces that same action as a visible hover control.

How

Reuses the existing onOpenFile handler already wired to the panel. The button renders on row hover next to the stage/discard controls (only for non-deleted files, matching the existing "Open File" menu-item guard). No change to the diff-click behavior or the context menu.

Testing

• pnpm exec tsc --noEmit clean
• Manual smoke-test: hovered a modified file, clicked the button, file opened in an editable editor tab; edited and saved with ⌘S. Deleted files correctly show no button. Diff-on-click and the context-menu "Open File" both still work.
• Platforms tested: macOS

Screenshots / GIFs

Hover a changed file row → a file icon button appears beside the stage checkbox; clicking it opens the editable file.

Notes for reviewer

Tiny, focused change (one file, +13 lines). Pure discoverability win for an action that already existed in the context menu. Happy to adjust the icon or placement.

Summary by CodeRabbit

• New Features
  • Added an inline “Open file for editing” action to changed file entries in source control.
  • The action appears only when a file can be opened and is hidden for deleted items.
  • The new control is integrated into each row with hover/focus visibility for a cleaner experience.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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Plan: Pro Plus

Run ID: 3e2c9d94-2525-43af-92a1-7f37c9945ba3

📥 Commits

Reviewing files that changed from the base of the PR and between 1c7f3e4 and c075661.

📒 Files selected for processing (1)

• src/modules/source-control/SourceControlPanel.tsx

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📝 Walkthrough

Walkthrough

Adds a new inline "Open file for editing" icon button to each row in SourceControlPanel's changed-file list. The button is conditionally rendered based on deletion state, path availability, and callback presence, using the newly imported File01Icon.

Changes

Open File Action

Layer / File(s)	Summary
Row-level open file button src/modules/source-control/SourceControlPanel.tsx	Imports File01Icon and adds a conditional IconActionButton in EntryRow that opens a file for editing when not deleted, onOpenFile is provided, and an absolute path exists, with hover/focus-driven visibility.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Related Issues: None specified

Related PRs: None specified

Suggested labels: ui, source-control

Suggested reviewers: None specified

Poem:
A rabbit hops through diff-lit trees,
One icon added, light as breeze,
"Open file," it softly says,
Hover close and it displays,
Thirteen lines, no code decays. 🐇

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title follows Conventional Commits and accurately summarizes the added hover action for opening changed files for editing.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[wang-mingxue]

Heads-up per CONTRIBUTING: this wasn't pre-discussed in an issue/Discord. It's a small, self-contained discoverability tweak (one file, +13 lines) surfacing the existing "Open File" context-menu action as a hover button — so I opened it directly. If you'd rather align on direction first, happy to move the discussion to an issue or Discord, or close it. No worries either way.