Wrap long Unit Tree AoS dropdown items

[ryanhiizy]

Summary

• Prevents long AoS items from being clipped in the Unit Tree AoS dropdown.
• Follows the app’s current pattern of letting long dropdown items wrap instead of widening the menu.

Testing

• Ran pnpm --filter webapp typecheck.
• Ran pnpm --filter webapp build.

Screenshots

Before:

After:

[jason301c]

LGTM