Show File Manager label on Linux for the Open Folder button

[ivan-ottinger]

Related issues

• Fixes STU-1753

How AI was used in this PR

Used Claude Code to locate the two label sites (the site-overview shortcut button and the site context menu) and add the Linux branch. I verified the changes, lint, typecheck, and ran the affected tests myself.

Proposed Changes

• On Linux, show "File Manager" (instead of falling through to the macOS "Finder" label) for the Open Folder shortcut button on the site overview tab.
• Same fix for the "Open in …" item in the site list context menu.

Before	After

Testing Instructions

• On Linux, open Studio and select a site.
• On the Overview tab, in the "Open in…" section, confirm the first button is labeled File Manager (was "Finder").
• Right-click a site in the sidebar and confirm the menu shows Open in File Manager (was "Open in Finder").
• Clicking either still opens the site folder in the system file manager.
• Verify macOS still shows Finder and Windows still shows File Explorer.

Pre-merge Checklist

• Have you checked for TypeScript, React or other console errors?

[Copilot]

Pull request overview

This PR fixes Linux-specific UI labeling by introducing a shared helper for the system file manager name and using it in both the Overview “Open in…” shortcut button and the site context menu label generation.

Changes:

• Added getFileManagerLabel() to return “File Explorer” (Windows), “File Manager” (Linux), or “Finder” (macOS).
• Updated ContentTabOverview and SiteMenu to use the new helper instead of a Windows-vs-mac fallback.
• Updated affected component tests to mock the new helper.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
apps/studio/src/lib/file-manager.ts	New helper that returns a localized platform-specific file manager label (adds Linux “File Manager”).
apps/studio/src/components/content-tab-overview.tsx	Uses getFileManagerLabel() for the Overview “Open in…” section first shortcut button label.
apps/studio/src/components/site-menu.tsx	Uses getFileManagerLabel() when building the context-menu payload label.
apps/studio/src/components/tests/content-tab-overview.test.tsx	Mocks src/lib/file-manager to keep component tests deterministic.
apps/studio/src/components/tests/content-tab-overview-shortcuts-section.test.tsx	Mocks src/lib/file-manager to keep component tests deterministic.

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