fix: cancel pending RAFs in resetExecutionState and handleExecuting

Prevents a race condition where:
1. A progress WebSocket event arrives and schedules a RAF
2. An execution-end event fires and clears all state
3. The pending RAF callback fires and writes stale data back

https://github.com/Comfy-Org/ComfyUI_frontend/pull/9303#discussion_r2923324838

src/stores/executionStore.ts

@@ -296,6 +296,11 @@ export const useExecutionStore = defineStore('execution', () => {
   }
 
   function handleExecuting(e: CustomEvent<NodeId | null>): void {
+    // Cancel any pending progress RAF before clearing state to prevent
+    // stale data from being written back on the next frame.
+    progressBatch.cancel()
+    _pendingProgress = null
+
     // Clear the current node progress when a new node starts executing
     _executingNodeProgress.value = null
 
@@ -520,6 +525,13 @@ export const useExecutionStore = defineStore('execution', () => {
    * Reset execution-related state after a run completes or is stopped.
    */
   function resetExecutionState(jobIdParam?: string | null) {
+    // Cancel pending RAFs before clearing state to prevent stale data
+    // from being written back on the next frame.
+    progressBatch.cancel()
+    _pendingProgress = null
+    progressStateBatch.cancel()
+    _pendingProgressState = null
+
     executionIdToLocatorCache.clear()
     nodeProgressStates.value = {}
     const jobId = jobIdParam ?? activeJobId.value ?? null