fix: gate missing model error flags behind ShowErrorsTab setting

When ShowErrorsTab is disabled, skip flagging nodes with has_errors for
missing models so legacy canvas does not render red error borders.
The scan still runs and missingModelStore is populated normally.

Also disable ShowErrorsTab in additional E2E tests (rightClickMenu,
colorPalette, rerouteNode, selectionToolbox) to prevent screenshot
mismatches from missing model error indicators.

browser_tests/tests/colorPalette.spec.ts

@@ -5,6 +5,10 @@ import type { WorkspaceStore } from '../types/globals'
 
 test.beforeEach(async ({ comfyPage }) => {
   await comfyPage.settings.setSetting('Comfy.UseNewMenu', 'Disabled')
+  await comfyPage.settings.setSetting(
+    'Comfy.RightSidePanel.ShowErrorsTab',
+    false
+  )
 })
 
 const customColorPalettes = {

browser_tests/tests/rerouteNode.spec.ts

@@ -6,6 +6,10 @@ import { getMiddlePoint } from '../fixtures/utils/litegraphUtils'
 test.describe('Reroute Node', { tag: ['@screenshot', '@node'] }, () => {
   test.beforeEach(async ({ comfyPage }) => {
     await comfyPage.settings.setSetting('Comfy.UseNewMenu', 'Top')
+    await comfyPage.settings.setSetting(
+      'Comfy.RightSidePanel.ShowErrorsTab',
+      false
+    )
   })
 
   test.afterEach(async ({ comfyPage }) => {
@@ -45,6 +49,10 @@ test.describe(
     test.beforeEach(async ({ comfyPage }) => {
       await comfyPage.settings.setSetting('Comfy.UseNewMenu', 'Disabled')
       await comfyPage.settings.setSetting('LiteGraph.Reroute.SplineOffset', 80)
+      await comfyPage.settings.setSetting(
+        'Comfy.RightSidePanel.ShowErrorsTab',
+        false
+      )
     })
 
     test('loads from workflow', async ({ comfyPage }) => {

browser_tests/tests/selectionToolbox.spec.ts

@@ -8,6 +8,10 @@ const test = comfyPageFixture
 
 test.beforeEach(async ({ comfyPage }) => {
   await comfyPage.settings.setSetting('Comfy.UseNewMenu', 'Disabled')
+  await comfyPage.settings.setSetting(
+    'Comfy.RightSidePanel.ShowErrorsTab',
+    false
+  )
 })
 const BLUE_COLOR = 'rgb(51, 51, 85)'
 const RED_COLOR = 'rgb(85, 51, 51)'

src/stores/executionErrorStore.ts

@@ -505,10 +505,15 @@ export const useExecutionErrorStore = defineStore('executionError', () => {
     [lastNodeErrors, () => missingModelStore.missingModelNodeIds],
     () => {
       if (!app.isGraphReady) return
+      const showErrorsTab = useSettingStore().get(
+        'Comfy.RightSidePanel.ShowErrorsTab'
+      )
       reconcileNodeErrorFlags(
         app.rootGraph,
         lastNodeErrors.value,
-        missingModelStore.missingModelAncestorExecutionIds
+        showErrorsTab
+          ? missingModelStore.missingModelAncestorExecutionIds
+          : new Set()
       )
     },
     { flush: 'post' }