feat(application): add OTHER as valid tissue value in GUI metadata grid

[omid-aignostics]

Summary

• Adds OTHER as a valid tissue value in the GUI metadata grid
• Updates the dropdown, validation, and cell highlighting to accept OTHER

Notes

• No changes needed for the CLI or Python library — they already accept any string for tissue

Test plan

• Verify OTHER appears in the tissue dropdown in the GUI metadata grid
• Verify selecting OTHER marks the cell green
• Verify the "Next" button enables when all rows have valid tissue and disease values including OTHER

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[Copilot]

Pull request overview

Adds "OTHER" as an accepted tissue value in the Application “Describe” GUI metadata grid, ensuring users can select it and still pass client-side validation and visual validity highlighting.

Changes:

• Extend tissue validation to treat "OTHER" as a valid value.
• Add "OTHER" to the tissue dropdown options in the metadata grid.
• Update tissue cell highlighting rules so "OTHER" is marked as valid (green) rather than invalid (red).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

Files with missing lines	Coverage Δ
...ics/application/_gui/_page_application_describe.py	72.13% <ø> (ø)

... and 1 file with indirect coverage changes