fix: disable control after generate during partial execution (#8774)

## Summary
Passes an isPartialExecution flag through widget
beforeQueued/afterQueued callbacks so control-after-generate widgets
skip value modifications (randomize, increment, decrement) when the user
queues selected output nodes via partial execution.

requested by @christian-byrne in notion

## Screenshots (if applicable)
before


https://github.com/user-attachments/assets/3e723087-8849-457b-9f95-b8b5fceab0ed


after


https://github.com/user-attachments/assets/d9816667-51e0-4538-a012-9c84d0944019

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8774-fix-disable-control-after-generate-during-partial-execution-3036d73d365081688ca3d6b0506d69ca)
by [Unito](https://www.unito.io)

src/scripts/app.ts

@@ -1389,11 +1389,13 @@ export class ComfyApp {
           'Comfy.Execution.PreviewMethod'
         )
 
+        const isPartialExecution = !!queueNodeIds?.length
         for (let i = 0; i < batchCount; i++) {
           // Allow widgets to run callbacks before a prompt has been queued
           // e.g. random seed before every gen
           forEachNode(this.rootGraph, (node) => {
-            for (const widget of node.widgets ?? []) widget.beforeQueued?.()
+            for (const widget of node.widgets ?? [])
+              widget.beforeQueued?.({ isPartialExecution })
           })
 
           const p = await this.graphToPrompt(this.rootGraph)
@@ -1449,7 +1451,9 @@ export class ComfyApp {
 
           // Allow widgets to run callbacks after a prompt has been queued
           // e.g. random seed after every gen
-          executeWidgetsCallback(queuedNodes, 'afterQueued')
+          executeWidgetsCallback(queuedNodes, 'afterQueued', {
+            isPartialExecution
+          })
           this.canvas.draw(true, true)
           await this.ui.queue.update()
         }

src/scripts/widgets.ts

@@ -273,8 +273,8 @@ export function addValueControlWidgets(
     }
   }
 
-  valueControl.beforeQueued = () => {
-    if (controlValueRunBefore()) {
+  valueControl.beforeQueued = ({ isPartialExecution } = {}) => {
+    if (!isPartialExecution && controlValueRunBefore()) {
       // Don't run on first execution
       if (valueControl[HAS_EXECUTED]) {
         applyWidgetControl()
@@ -283,8 +283,8 @@ export function addValueControlWidgets(
     valueControl[HAS_EXECUTED] = true
   }
 
-  valueControl.afterQueued = () => {
-    if (!controlValueRunBefore()) {
+  valueControl.afterQueued = ({ isPartialExecution } = {}) => {
+    if (!isPartialExecution && !controlValueRunBefore()) {
       applyWidgetControl()
     }
   }