feat: show image paths in editor

[dimafa]

Description

Expose the selected image's location consistently throughout the single-image editor while keeping the displayed path compact and aligned with the library folder tree.

Fixes #1472.

Type of Change

• New feature
• UI/UX improvement

Changes Made

• Show the image's parent folder beneath the filename in the expanded editor header and in Metadata → File Information.
• Display paths relative to the most specific matching library root, including the visible root folder name; fall back to the full parent folder outside a configured root.
• Replace either displayed path with Copy/Copied on hover while copying the complete physical file path, including the filename.
• Resolve virtual copies to their physical source path for display, clipboard, and file-reveal behavior.
• Add Show in File Explorer to the existing editor image context menu using the established native reveal command and translations.

Screenshots/Videos

Before

After

Metadata File Information

Path changes to Copy button on hover:

Testing

• These changes were tested locally by a human and confirmed to work.
• I haven't added any automated tests to the code because the codebase currently lacks a test suite.

Test Configuration:

• OS: macOS 26.4
• Hardware: Apple Silicon (arm64)

Checklist

• My code follows the project's code style
• I haven't added unnecessary AI-generated code comments
• My changes generate no new warnings or errors

Additional Notes

The repository-wide typecheck, lint, format:check, and i18n:check commands currently fail on unchanged upstream issues. The production build, native debug bundle, targeted formatting check, focused path cases, and native UI validation pass for this change.

AI Disclaimer:

Please state the involvement of AI in this PR:

• This PR is mostly AI-generated but edited/merged together by a human