fix: resolve editor paths from repo root

[duarteocarmo]

@benvinegar - there is a bug when launching the editor from a place that is not the repo root.
This PR should fix it.

[greptile-apps]

Greptile Summary

This PR fixes the e editor shortcut when Hunk is launched from a repo subdirectory by resolving the selected diff file's path against the VCS repo root (sourceLabel) instead of the process working directory.

• A new exported helper resolveEditableFilePath(filePath, basePath?) wraps node:path's resolve with a process.cwd() default, replacing the inline resolve(process.cwd(), file.path) call in openSelectedFileInEditor.
• App.tsx derives basePath from bootstrap.changeset.sourceLabel (the repo root) when input.kind is vcs, show, or stash-show, and passes undefined otherwise so the pre-existing cwd fallback is preserved for diff, patch, and difftool inputs.
• A unit test for the new helper is added to openInEditor.test.ts.

Confidence Score: 5/5

This is a focused, well-scoped bug fix with correct logic and no regressions introduced.

The input-kind guard in App.tsx correctly limits repo-root resolution to the three VCS-backed input kinds where sourceLabel is always an absolute repo root path; the cwd fallback is preserved for all other input types. The resolve call in the helper handles already-absolute paths safely. No edge cases or data-flow issues were found.

No files require special attention.

Important Files Changed

Filename	Overview
src/ui/lib/openInEditor.ts	Extracts path resolution into a new exported helper resolveEditableFilePath that accepts an optional basePath (defaulting to process.cwd()), and threads that parameter through openSelectedFileInEditor; logic is correct and the fallback preserves prior behaviour for non-VCS inputs.
src/ui/App.tsx	Computes basePath from bootstrap.changeset.sourceLabel (the repo root) when the input kind is vcs, show, or stash-show, and correctly passes undefined for the remaining kinds (diff, patch, difftool) so the cwd fallback is used; both new deps are added to the useCallback array.
src/ui/lib/openInEditor.test.ts	Adds a test for resolveEditableFilePath; the test verifies the correct argument order and that basePath is honoured, though it only covers the explicit-path happy path.
CHANGELOG.md	User-visible changelog entry added for the subdirectory editor-shortcut fix.

Sequence Diagram

sequenceDiagram
    participant App as App.tsx
    participant OE as openInEditor.ts
    participant FS as filesystem

    App->>App: User presses 'e'
    App->>App: Determine basePath
    note over App: sourceLabel if vcs/show/stash-show, else undefined
    App->>OE: "openSelectedFileInEditor({ basePath, file, … })"
    OE->>OE: resolveEditableFilePath(file.path, basePath)
    note over OE: resolve(basePath ?? cwd, file.path)
    OE->>FS: existsSync(absolutePath)
    alt file exists
        OE->>OE: buildEditorCommand(editor, absolutePath, line)
        OE->>OE: Bun.spawnSync([editor, …args])
    else file not found
        OE-->>App: Cannot edit …: file does not exist on disk.
    end

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_{Reviews (1): Last reviewed commit: "fix: resolve editor paths from repo root" | Re-trigger Greptile}

[benvinegar]

Makes sense, thanks for the follow up!