fix: only show port label prompt inside component editor

Double-click rename for INPUT/OUTPUT/CLOCK gates now only triggers
when inside the component editor, not in the main circuit.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

js/events.js

@@ -159,8 +159,8 @@ export function initEvents() {
             return;
         }
 
-        // Double-click on I/O gates → rename
-        if (gate.type === 'INPUT' || gate.type === 'OUTPUT' || gate.type === 'CLOCK') {
+        // Double-click on I/O gates → rename (only inside component editor)
+        if (state.componentEditorActive && (gate.type === 'INPUT' || gate.type === 'OUTPUT' || gate.type === 'CLOCK')) {
             const current = gate.label || '';
             const label = prompt(`Label for ${gate.type}#${gate.id}:`, current);
             if (label !== null) {