feat(lora-cycler): implement batch queue synchronization with dual-index mechanism

- Add execution_index and next_index fields to CyclerConfig interface
- Introduce beforeQueued hook in widget to handle index shifting for batch executions
- Use execution_index when provided, fall back to current_index for single executions
- Track execution state with Symbol to differentiate first vs subsequent executions
- Update state management to handle dual-index logic for proper LoRA cycling in batch queues

vue-widgets/src/components/LoraCyclerWidget.vue

@@ -34,6 +34,9 @@ const props = defineProps<{
 // State management
 const state = useLoraCyclerState(props.widget)
 
+// Symbol to track if the widget has been executed at least once
+const HAS_EXECUTED = Symbol('HAS_EXECUTED')
+
 // Track last known pool config hash
 const lastPoolConfigHash = ref('')
 
@@ -124,6 +127,28 @@ onMounted(async () => {
     state.restoreFromConfig(props.widget.value as CyclerConfig)
   }
 
+  // Add beforeQueued hook to handle index shifting for batch queue synchronization
+  // This ensures each execution uses a different LoRA in the cycle
+  ;(props.widget as any).beforeQueued = () => {
+    if ((props.widget as any)[HAS_EXECUTED]) {
+      // After first execution: shift indices (previous next_index becomes execution_index)
+      state.generateNextIndex()
+    } else {
+      // First execution: just initialize next_index (execution_index stays null)
+      // This means first execution uses current_index from widget
+      state.initializeNextIndex()
+      ;(props.widget as any)[HAS_EXECUTED] = true
+    }
+
+    // Update the widget value so the indices are included in the serialized config
+    const config = state.buildConfig()
+    if ((props.widget as any).updateConfig) {
+      ;(props.widget as any).updateConfig(config)
+    } else {
+      props.widget.value = config
+    }
+  }
+
   // Mark component as mounted
   isMounted.value = true