[SandObserver]

Summary

• Give the sidebar version line a min-height of one line, so the navigation does not move down when /api/version answers.
• Set scrollbar-gutter: stable on the settings page, so the card does not shift when a classic scrollbar appears.

Testing
All green. Added an e2e test that the navigation stays put when the version loads, and a stylesheet test for the gutter.

Changelog

Fixed

• The settings navigation no longer jumps when the version number loads.
• The settings page no longer shifts sideways when its scrollbar appears.

Checklist

• Stays within the project constraints: one container, no runtime dependencies, no build step (see CONTRIBUTING.md).
• Tests added or updated for new logic, and the full suite, lint, and typechecks pass.
• Docs updated if behavior or configuration changed.