Input port rendering on standard gates and components read srcGate.value
to determine active state, but for multi-output gates (BUS_OUT, COMPONENT)
.value only holds port 0's value. Connections from port N>0 always showed
port 0's state visually despite working correctly at the logic level.
Extract getSourcePortValue() helper that checks outputValues[fromPort]
for multi-output sources, and apply it consistently across all three
input port renderers (drawGate, drawBusGate, drawComponentGate).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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