fix(core): in edgeless mode, an error occurs when asking AI questions without selecting any content (#12437)

### TL;DR

fix: in edgeless mode, an error occurs when asking AI questions without selecting any content

> CLOSE AI-133

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit

- **New Features**
  - Added support for asking AI input in edgeless mode when no content is selected.
  - Enhanced AI panel behavior with improved input handling and chat message sending in edgeless mode.
- **Bug Fixes**
  - Improved handling of AI chat input visibility and context extraction in edgeless mode.
- **Tests**
  - Introduced new end-to-end tests to verify chat interactions with AI in edgeless mode.
  - Centralized editor content removal logic in test utilities for better maintainability.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/frontend/core/src/blocksuite/ai/utils/edgeless.ts

@@ -6,14 +6,9 @@ import {
   type ShapeElementModel,
 } from '@blocksuite/affine/model';
 import { matchModels } from '@blocksuite/affine/shared/utils';
-import type { BlockComponent, EditorHost } from '@blocksuite/affine/std';
+import type { BlockComponent } from '@blocksuite/affine/std';
 import type { GfxModel } from '@blocksuite/affine/std/gfx';
 
-import {
-  AFFINE_EDGELESS_COPILOT_WIDGET,
-  type EdgelessCopilotWidget,
-} from '../widgets/edgeless-copilot';
-
 export function mindMapToMarkdown(mindmap: MindmapElementModel) {
   let markdownStr = '';
 
@@ -45,17 +40,7 @@ export function isMindmapChild(ele: GfxModel) {
   return ele?.group instanceof MindmapElementModel && !isMindMapRoot(ele);
 }
 
-export function getEdgelessCopilotWidget(
-  host: EditorHost
-): EdgelessCopilotWidget {
-  const rootBlockId = host.store.root?.id as string;
-  const copilotWidget = host.view.getWidget(
-    AFFINE_EDGELESS_COPILOT_WIDGET,
-    rootBlockId
-  ) as EdgelessCopilotWidget;
-
-  return copilotWidget;
-}
+export { getEdgelessCopilotWidget } from './get-edgeless-copilot-widget';
 
 export function findNoteBlockModel(blockElement: BlockComponent) {
   let curBlock = blockElement;

packages/frontend/core/src/blocksuite/ai/utils/get-edgeless-copilot-widget.ts

@@ -0,0 +1,16 @@
+import type { EditorHost } from '@blocksuite/affine/std';
+
+import type { EdgelessCopilotWidget } from '../widgets/edgeless-copilot';
+import { AFFINE_EDGELESS_COPILOT_WIDGET } from '../widgets/edgeless-copilot/constant';
+
+export function getEdgelessCopilotWidget(
+  host: EditorHost
+): EdgelessCopilotWidget {
+  const rootBlockId = host.store.root?.id as string;
+  const copilotWidget = host.view.getWidget(
+    AFFINE_EDGELESS_COPILOT_WIDGET,
+    rootBlockId
+  ) as EdgelessCopilotWidget;
+
+  return copilotWidget;
+}

packages/frontend/core/src/blocksuite/ai/utils/selection-utils.ts

@@ -29,7 +29,7 @@ import {
 
 import { getContentFromSlice } from '../../utils';
 import type { CopilotTool } from '../tool/copilot-tool';
-import { getEdgelessCopilotWidget } from './edgeless';
+import { getEdgelessCopilotWidget } from './get-edgeless-copilot-widget';
 
 export async function selectedToCanvas(host: EditorHost) {
   const gfx = host.std.get(GfxControllerIdentifier);

packages/frontend/core/src/blocksuite/ai/widgets/edgeless-copilot/constant.ts

@@ -0,0 +1 @@
+export const AFFINE_EDGELESS_COPILOT_WIDGET = 'affine-edgeless-copilot-widget';

packages/frontend/core/src/blocksuite/ai/widgets/edgeless-copilot/index.ts

@@ -27,13 +27,14 @@ import { styleMap } from 'lit/directives/style-map.js';
 import { literal, unsafeStatic } from 'lit/static-html.js';
 
 import type { AIItemGroupConfig } from '../../components/ai-item/types.js';
+import { AIProvider } from '../../provider/index.js';
+import { extractSelectedContent } from '../../utils/extract.js';
 import {
   AFFINE_AI_PANEL_WIDGET,
   AffineAIPanelWidget,
 } from '../ai-panel/ai-panel.js';
 import { EdgelessCopilotPanel } from '../edgeless-copilot-panel/index.js';
-
-export const AFFINE_EDGELESS_COPILOT_WIDGET = 'affine-edgeless-copilot-widget';
+import { AFFINE_EDGELESS_COPILOT_WIDGET } from './constant.js';
 
 export class EdgelessCopilotWidget extends WidgetComponent<RootBlockModel> {
   static override styles = css`
@@ -95,6 +96,31 @@ export class EdgelessCopilotWidget extends WidgetComponent<RootBlockModel> {
 
       if (input instanceof AffineAIPanelWidget) {
         input.setState('input', referenceElement);
+        const aiPanel = input;
+        // TODO: @xiaojun refactor these scattered config overrides
+        if (aiPanel.config && !aiPanel.config.generateAnswer) {
+          aiPanel.config.generateAnswer = ({ finish, input }) => {
+            finish('success');
+            aiPanel.hide();
+            extractSelectedContent(this.host)
+              .then(context => {
+                AIProvider.slots.requestSendWithChat.next({
+                  input,
+                  context,
+                  host: this.host,
+                });
+              })
+              .catch(console.error);
+          };
+          aiPanel.config.inputCallback = text => {
+            const panel = this.shadowRoot?.querySelector(
+              'edgeless-copilot-panel'
+            );
+            if (panel instanceof HTMLElement) {
+              panel.style.visibility = text ? 'hidden' : 'visible';
+            }
+          };
+        }
         requestAnimationFrame(() => {
           this._createCopilotPanel();
           this._updateCopilotPanel(input);
@@ -314,3 +340,5 @@ declare global {
     [AFFINE_EDGELESS_COPILOT_WIDGET]: EdgelessCopilotWidget;
   }
 }
+
+export * from './constant';