[philipgreat]

Summary

• Add consistent right-side spacing for native dropdown arrows across the console.
• Add a searchable, keyboard-accessible chooser for repository and format lists when they are long.
• Apply the chooser to troubleshooting, offline inventory, client setup, artifact search, repository creation, and storage operations.
• Fix the mobile diagnostic search layout so dropdown controls keep their own alignment.

Verification

• npm --prefix console run build
• git diff --check
• Browser smoke test with 18 mock repositories: type-to-filter, Enter selection, arrow inset, native select spacing, diagnosis flow, desktop/mobile layouts, and no mobile horizontal overflow.