Handle 'z' and 'x' states for output node

[RII6]

Description

When runner sends 'z' or 'x' state, frontend does not react

Steps to Reproduce

1. Create SR-latch
2. Try to interact with inputs

Expected Behavior

State 'x' for led

Actual Behavior

Status 0 for led

Severity

• Low (minor inconvenience or workaround available)
• Medium (noticeable impact but not blocking)
• High (blocks development or critical functionality)