feat: auto-resolve simple validation errors on widget change and slot connection (#9464)

## Summary

Automatically clears transient validation errors
(`value_bigger_than_max`, `value_smaller_than_min`, `value_not_in_list`,
`required_input_missing`) when the user modifies a widget value or
connects an input slot, so resolved errors don't linger in the error
panel. Also clears missing model state when the user changes a combo
widget value.

## Changes

- **`useNodeErrorAutoResolve` composable**: watches widget changes and
slot connections, clears matching errors via `executionErrorStore`
- **`executionErrorStore`**: adds `clearSimpleNodeErrors` and
`clearSimpleWidgetErrorIfValid` with granular per-slot error removal
- **`executionErrorUtil`**: adds `isValueStillOutOfRange` to prevent
premature clearing when a new value still violates the constraint
- **`graphTraversalUtil`**: adds `getExecutionIdFromNodeData` for
subgraph-aware execution ID resolution
- **`GraphCanvas.vue`**: fixes subgraph error key lookup by using
`getExecutionIdByNode` instead of raw `node.id`
- **`NodeWidgets.vue`**: wires up the new composable to the widget layer
- **`missingModelStore`**: adds `removeMissingModelByWidget` to clear
missing model state on widget value change
- **`useGraphNodeManager`**: registers composable per node
- **Tests**: 126 new unit tests covering error clearing, range
validation, and graph traversal edge cases

## Screenshots



https://github.com/user-attachments/assets/515ea811-ff84-482a-a866-a17e5c779c39



https://github.com/user-attachments/assets/a2b30f02-4929-4537-952c-a0febe20f02e


┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-9464-feat-auto-resolve-simple-validation-errors-on-widget-change-and-slot-connection-31b6d73d3650816b8afdc34f4b40295a)
by [Unito](https://www.unito.io)

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

src/composables/graph/useGraphNodeManager.ts

@@ -36,6 +36,7 @@ import type {
 import type { TitleMode } from '@/lib/litegraph/src/types/globalEnums'
 import { NodeSlotType } from '@/lib/litegraph/src/types/globalEnums'
 import { app } from '@/scripts/app'
+import { getExecutionIdByNode } from '@/utils/graphTraversalUtil'
 
 export interface WidgetSlotMetadata {
   index: number
@@ -80,6 +81,13 @@ export interface SafeWidgetData {
    * which differs from the subgraph node's input slot widget name.
    */
   slotName?: string
+  /**
+   * Execution ID of the interior node that owns the source widget.
+   * Only set for promoted widgets where the source node differs from the
+   * host subgraph node. Used for missing-model lookups that key by
+   * execution ID (e.g. `"65:42"` vs the host node's `"65"`).
+   */
+  sourceExecutionId?: string
 }
 
 export interface VueNodeData {
@@ -324,10 +332,21 @@ function safeWidgetMapper(
             }
           : (extractWidgetDisplayOptions(effectiveWidget) ?? options),
         slotMetadata: slotInfo,
+        // For promoted widgets, name is sourceWidgetName while widget.name
+        // is the subgraph input slot name — store the slot name for lookups.
         slotName: name !== widget.name ? widget.name : undefined,
+        sourceExecutionId:
+          sourceNode && app.rootGraph
+            ? (getExecutionIdByNode(app.rootGraph, sourceNode) ?? undefined)
+            : undefined,
         tooltip: widget.tooltip
       }
     } catch (error) {
+      console.warn(
+        '[safeWidgetMapper] Failed to map widget:',
+        widget.name,
+        error
+      )
       return {
         name: widget.name || 'unknown',
         type: widget.type || 'text'
@@ -642,6 +661,12 @@ export function useGraphNodeManager(graph: LGraph): GraphNodeManager {
                 title: String(propertyEvent.newValue)
               })
               break
+            case 'has_errors':
+              vueNodeData.set(nodeId, {
+                ...currentData,
+                hasErrors: Boolean(propertyEvent.newValue)
+              })
+              break
             case 'flags.collapsed':
               vueNodeData.set(nodeId, {
                 ...currentData,