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/platform/missingModel/missingModelStore.ts

@@ -116,6 +116,15 @@ export const useMissingModelStore = defineStore('missingModel', () => {
       missingModelCandidates.value = null
   }
 
+  function removeMissingModelByWidget(nodeId: string, widgetName: string) {
+    if (!missingModelCandidates.value) return
+    missingModelCandidates.value = missingModelCandidates.value.filter(
+      (m) => !(String(m.nodeId) === nodeId && m.widgetName === widgetName)
+    )
+    if (!missingModelCandidates.value.length)
+      missingModelCandidates.value = null
+  }
+
   function hasMissingModelOnNode(nodeLocatorId: string): boolean {
     return missingModelNodeIds.value.has(nodeLocatorId)
   }
@@ -175,9 +184,11 @@ export const useMissingModelStore = defineStore('missingModel', () => {
     missingModelCount,
     missingModelNodeIds,
     activeMissingModelGraphIds,
+    missingModelAncestorExecutionIds,
 
     setMissingModels,
     removeMissingModelByNameOnNodes,
+    removeMissingModelByWidget,
     clearMissingModels,
     createVerificationAbortController,