refactor(core): ai input images display & max images count (#12395)

### TL;DR

* refactor: use horizontal scrolling to display images​
* refactor: change max images to 9
* test: add test cases for validating the maximum number of uploadable images

> CLOSE AI-6

![截屏2025-05-20 17.12.02.png](https://graphite-user-uploaded-assets-prod.s3.amazonaws.com/MyktQ6Qwc7H6TiRCFoYN/e234dd02-3bb8-4ea8-b69b-93c71b203a4e.png)

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

## Summary by CodeRabbit

- **New Features**
  - Added a notification to inform users when attempting to upload more images than allowed in the AI chat input.

- **Bug Fixes**
  - Prevented uploading more than 9 images at once in the AI chat input.

- **Style**
  - Improved image preview grid layout to display images in a single horizontally scrollable row.

- **Tests**
  - Added an end-to-end test to verify that an error message appears when too many images are uploaded.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/frontend/core/src/blocksuite/ai/components/ai-chat-input/ai-chat-input.ts

@@ -1,3 +1,4 @@
+import { toast } from '@affine/component';
 import { stopPropagation } from '@affine/core/utils';
 import type { CopilotSessionType } from '@affine/graphql';
 import { SignalWatcher, WithDisposable } from '@blocksuite/affine/global/lit';
@@ -531,6 +532,10 @@ export class AIChatInput extends SignalWatcher(WithDisposable(LitElement)) {
       multiple: true,
     });
     if (!images) return;
+    if (this.chatContextValue.images.length + images.length > MAX_IMAGE_COUNT) {
+      toast(`You can only upload up to ${MAX_IMAGE_COUNT} images`);
+      return;
+    }
     this.addImages(images);
   };
 

packages/frontend/core/src/blocksuite/ai/components/ai-chat-input/const.ts

@@ -1 +1 @@
-export const MAX_IMAGE_COUNT = 32;
+export const MAX_IMAGE_COUNT = 9;

packages/frontend/core/src/blocksuite/ai/components/image-preview-grid.ts

@@ -7,16 +7,19 @@ import { repeat } from 'lit/directives/repeat.js';
 export class ImagePreviewGrid extends LitElement {
   static override styles = css`
     .image-preview-wrapper {
-      overflow: hidden scroll;
-      max-height: 128px;
+      overflow-x: auto;
+      overflow-y: hidden;
+      max-height: 80px;
+      white-space: nowrap;
     }
 
     ${scrollbarStyle('.image-preview-wrapper')}
 
     .images-container {
       display: flex;
+      flex-direction: row;
       gap: 4px;
-      flex-wrap: wrap;
+      flex-wrap: nowrap;
       position: relative;
     }
 
@@ -31,6 +34,7 @@ export class ImagePreviewGrid extends LitElement {
       display: flex;
       justify-content: center;
       align-items: center;
+      flex: 0 0 auto;
     }
 
     .image-container img {

tests/affine-cloud-copilot/e2e/utils/chat-panel-utils.ts

@@ -236,10 +236,9 @@ export class ChatPanelUtils {
     await this.makeChat(page, text);
   }
 
-  public static async chatWithImages(
+  public static async uploadImages(
     page: Page,
-    images: { name: string; mimeType: string; buffer: Buffer }[],
-    text: string
+    images: { name: string; mimeType: string; buffer: Buffer }[]
   ) {
     await page.evaluate(() => {
       delete window.showOpenFilePicker;
@@ -251,6 +250,14 @@ export class ChatPanelUtils {
 
     const fileChooser = await fileChooserPromise;
     await fileChooser.setFiles(images);
+  }
+
+  public static async chatWithImages(
+    page: Page,
+    images: { name: string; mimeType: string; buffer: Buffer }[],
+    text: string
+  ) {
+    await this.uploadImages(page, images);
 
     await page.waitForSelector('ai-chat-input img');
     await this.makeChat(page, text);