feat: node-specific error tab with selection-aware grouping and error overlay (#8956)

## Summary
Enhances the error panel with node-specific views: single-node selection
shows errors grouped by message in compact mode, container nodes
(subgraph/group) expose child errors via a badge and "See Error" button,
and a floating ErrorOverlay appears after execution failure with a
deduplicated summary and quick navigation to the errors tab.

## Changes
- **Consolidate error tab**: Remove `TabError.vue`; merge all error
display into `TabErrors.vue` and drop the separate `error` tab type from
`rightSidePanelStore`
- **Selection-aware grouping**: Single-node selection regroups errors by
message (not `class_type`) and renders `ErrorNodeCard` in compact mode
- **Container node support**: Detect child-node errors in subgraph/group
nodes via execution ID prefix matching; show error badge and "See Error"
button in `SectionWidgets`
- **ErrorOverlay**: New floating card shown after execution failure with
deduplicated error messages, "Dismiss" and "See Errors" actions;
`isErrorOverlayOpen` / `showErrorOverlay` / `dismissErrorOverlay` added
to `executionStore`
- **Refactor**: Centralize error ID collection in `executionStore`
(`allErrorExecutionIds`, `hasInternalErrorForNode`); split `errorGroups`
into `allErrorGroups` (unfiltered) and `tabErrorGroups`
(selection-filtered); move `ErrorOverlay` business logic into
`useErrorGroups`

## Review Focus
- `useErrorGroups.ts`: split into `allErrorGroups` / `tabErrorGroups`
and the new `filterBySelection` parameter flow
- `executionStore.ts`: `hasInternalErrorForNode` helper and
`allErrorExecutionIds` computed
- `ErrorOverlay.vue`: integration with `executionStore` overlay state
and `useErrorGroups`

## Screenshots
<img width="853" height="461" alt="image"
src="https://github.com/user-attachments/assets/a49ab620-4209-4ae7-b547-fba13da0c633"
/>
<img width="854" height="203" alt="image"
src="https://github.com/user-attachments/assets/c119da54-cd78-4e7a-8b7a-456cfd348f1d"
/>
<img width="497" height="361" alt="image"
src="https://github.com/user-attachments/assets/74b16161-cf45-454b-ae60-24922fe36931"
/>

---------

Co-authored-by: GitHub Action <action@github.com>
Co-authored-by: github-actions <github-actions@github.com>

src/scripts/api.ts

@@ -831,7 +831,20 @@ export class ComfyApi extends EventTarget {
     })
 
     if (res.status !== 200) {
-      throw new PromptExecutionError(await res.json())
+      const text = await res.text()
+      let errorResponse
+      try {
+        errorResponse = JSON.parse(text)
+      } catch {
+        errorResponse = {
+          error: {
+            type: 'server_error',
+            message: `${res.status} ${res.statusText}`,
+            details: text
+          }
+        }
+      }
+      throw new PromptExecutionError(errorResponse)
     }
 
     return await res.json()

src/scripts/app.ts

@@ -71,7 +71,6 @@ import { SYSTEM_NODE_DEFS, useNodeDefStore } from '@/stores/nodeDefStore'
 import { useNodeReplacementStore } from '@/platform/nodeReplacement/nodeReplacementStore'
 import { useSubgraphStore } from '@/stores/subgraphStore'
 import { useWidgetStore } from '@/stores/widgetStore'
-import { useRightSidePanelStore } from '@/stores/workspace/rightSidePanelStore'
 import { useWorkspaceStore } from '@/stores/workspaceStore'
 import type { ComfyExtension, MissingNodeType } from '@/types/comfy'
 import type { ExtensionManager } from '@/types/extensionTypes'
@@ -713,13 +712,11 @@ export class ComfyApp {
             isInsufficientCredits: true
           })
         }
+      } else if (useSettingStore().get('Comfy.RightSidePanel.ShowErrorsTab')) {
+        useExecutionStore().showErrorOverlay()
       } else {
         useDialogService().showExecutionErrorDialog(detail)
       }
-      if (useSettingStore().get('Comfy.RightSidePanel.ShowErrorsTab')) {
-        this.canvas.deselectAll()
-        useRightSidePanelStore().openPanel('errors')
-      }
       this.canvas.draw(true, true)
     })
 
@@ -1465,7 +1462,10 @@ export class ComfyApp {
                 {}) as MissingNodeTypeExtraInfo
               const missingNodeType = createMissingNodeTypeFromError(extraInfo)
               this.showMissingNodesError([missingNodeType])
-            } else {
+            } else if (
+              !useSettingStore().get('Comfy.RightSidePanel.ShowErrorsTab') ||
+              !(error instanceof PromptExecutionError)
+            ) {
               useDialogService().showErrorDialog(error, {
                 title: t('errorDialog.promptExecutionError'),
                 reportType: 'promptExecutionError'
@@ -1500,11 +1500,8 @@ export class ComfyApp {
                 }
               }
 
-              // Clear selection and open the error panel so the user can immediately
-              // see the error details without extra clicks.
               if (useSettingStore().get('Comfy.RightSidePanel.ShowErrorsTab')) {
-                this.canvas.deselectAll()
-                useRightSidePanelStore().openPanel('errors')
+                executionStore.showErrorOverlay()
               }
               this.canvas.draw(true, true)
             }