Funky error display on system metric time picker

Looks bad whether focused or unfocused. Repro: extend time range into future (which tbh we should probably allow).

<img width="499" alt="Image" src="https://github.com/user-attachments/assets/89a20dc5-f55e-47d0-a428-a975ae726e66" />

<img width="498" alt="Image" src="https://github.com/user-attachments/assets/7d714931-0645-4339-9461-ee7738e65103" />