feat: add copy file name/path to git file menu

[imodeveloper]

Summary

• add "Copy file name" and "Copy file path" actions to the git file context menu
• reuse the resolved root/path logic for absolute paths
• cover the new menu actions with tests

Motivation

Quickly grab a file name or full path from the git changes list without leaving the app.

Testing

• npm run test
• npm run tauri build (fails: bundle_dmg.sh)

[Dimillian]

@codex review

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Normalize and bound-check workspace prefix before slicing

projectRelativePath is derived by checking resolvedRoot.startsWith(workspacePath) and then slicing by string length, which can misclassify roots that only share a textual prefix (for example /tmp/repo-tools vs /tmp/repo) and also fails on Windows when separators differ (C:\repo vs C:/repo). In these cases, "Copy file path" can produce incorrect values like -tools/src/file.ts or omit the expected subdirectory entirely, so this should use normalized path components and a directory-boundary check before trimming.

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