Add numbered command menu shortcuts

[powerfooI]

Summary

• add Cmd+1 through Cmd+9 shortcuts for the first nine visible command-menu actions
• keep numbering aligned with searched and deduplicated results, with keyboard-layout support and repeat protection
• show matching shortcut hints and accessibility metadata, and document the new shortcuts
• add focused coverage for ordering, modifiers, bounds, event handling, and international number-row layouts

Verification

• npx --yes bun@1.3.14 run lint
• npx --yes bun@1.3.14 run typecheck
• npx --yes bun@1.3.14 test (337 passed)