feat: CLK toggles on Step, add pan/zoom (arrows, +/-, wheel, 0=reset)

js/waveform.js

@@ -52,9 +52,23 @@ export function forceRecordSample() {
 }
 
 export function manualStep() {
+    // Toggle all CLOCK gates on each step (same as simTick)
+    state.gates.forEach(g => {
+        if (g.type === 'CLOCK') {
+            g.value = g.value ? 0 : 1;
+        }
+    });
+    // Use the lazy-loaded evaluateAll to avoid circular imports
+    if (_evaluateAll) _evaluateAll();
     forceRecordSample();
 }
 
+// Lazy reference to evaluateAll (set by gates.js to break circular dep)
+let _evaluateAll = null;
+export function setEvaluateAll(fn) {
+    _evaluateAll = fn;
+}
+
 export function updateWaveInfo() {
     const totalSamples = Object.values(state.waveData).reduce((sum, arr) => sum + arr.length, 0);
     document.getElementById('wave-info').textContent = `T=${state.timeStep} | ${totalSamples} samples`;