fix(core): re-layout ai-chat-content to display preview panel (#13030)

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

* **New Features**
* Introduced a split-view layout in the AI chat, allowing chat content
and a preview panel to be displayed side-by-side.
* Added responsive padding and layout adjustments for improved chat
panel appearance.

* **Refactor**
* Simplified the chat panel by removing the previous preview panel
feature and related state from the main chat component.
  * Updated internal logic to support the new split-view structure.

* **Style**
* Adjusted chat panel and workspace chat page styles for better layout
consistency and responsiveness.

* **Chores**
* Improved code organization and import statements for maintainability.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/frontend/core/src/blocksuite/ai/chat-panel/index.ts

@@ -13,16 +13,9 @@ import { ShadowlessElement } from '@blocksuite/affine/std';
 import type { ExtensionType, Store } from '@blocksuite/affine/store';
 import { CenterPeekIcon } from '@blocksuite/icons/lit';
 import { type Signal, signal } from '@preact/signals-core';
-import {
-  css,
-  html,
-  nothing,
-  type PropertyValues,
-  type TemplateResult,
-} from 'lit';
+import { css, html, nothing, type PropertyValues } from 'lit';
 import { property, state } from 'lit/decorators.js';
 import { keyed } from 'lit/directives/keyed.js';
-import { styleMap } from 'lit/directives/style-map.js';
 
 import type {
   DocDisplayConfig,
@@ -111,12 +104,6 @@ export class ChatPanel extends SignalWatcher(
   @state()
   accessor embeddingProgress: [number, number] = [0, 0];
 
-  @state()
-  accessor showPreviewPanel = false;
-
-  @state()
-  accessor previewPanelContent: TemplateResult<1> | null = null;
-
   private isSidebarOpen: Signal<boolean | undefined> = signal(false);
 
   private sidebarWidth: Signal<number | undefined> = signal(undefined);
@@ -269,7 +256,6 @@ export class ChatPanel extends SignalWatcher(
   private readonly resetPanel = () => {
     this.session = undefined;
     this.embeddingProgress = [0, 0];
-    this.showPreviewPanel = false;
     this.hasPinned = false;
   };
 
@@ -350,12 +336,7 @@ export class ChatPanel extends SignalWatcher(
       return nothing;
     }
 
-    const width = this.sidebarWidth.value || 0;
-    const style = styleMap({
-      padding: width > 540 ? '8px 24px 0 24px' : '8px 12px 0 12px',
-    });
-
-    const left = html`<div class="chat-panel-container" style=${style}>
+    return html`<div class="chat-panel-container">
       ${keyed(
         this.hasPinned ? this.session?.id : this.doc.id,
         html`<ai-chat-content
@@ -378,15 +359,6 @@ export class ChatPanel extends SignalWatcher(
         ></ai-chat-content>`
       )}
     </div>`;
-
-    const right = this.previewPanelContent;
-
-    return html`<chat-panel-split-view
-      .left=${left}
-      .right=${right}
-      .open=${this.showPreviewPanel}
-    >
-    </chat-panel-split-view>`;
   }
 }
 

packages/frontend/core/src/blocksuite/ai/chat-panel/split-view.ts

@@ -46,7 +46,8 @@ export class ChatPanelSplitView extends SignalWatcher(
       width: var(--gap);
       position: relative;
     }
-    .ai-chat-panel-split-view-divider[data-open='false'] {
+    .ai-chat-panel-split-view[data-open='false']
+      .ai-chat-panel-split-view-divider {
       width: 0;
       visibility: hidden;
       pointer-events: none;

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

@@ -88,6 +88,27 @@ export class AIChatContent extends SignalWatcher(
         overflow-y: visible;
       }
     }
+    chat-panel-split-view {
+      height: 100%;
+      width: 100%;
+      container-type: inline-size;
+      container-name: chat-panel-split-view;
+    }
+    .chat-panel-main {
+      display: flex;
+      flex-direction: column;
+      justify-content: center;
+      height: 100%;
+      width: 100%;
+      padding: 8px 24px 0 24px;
+      max-width: 800px;
+      margin: 0 auto;
+    }
+    @container chat-panel-split-view (width < 540px) {
+      .chat-panel-main {
+        padding: 8px 12px 0 12px;
+      }
+    }
   `;
 
   @property({ attribute: false })
@@ -152,6 +173,12 @@ export class AIChatContent extends SignalWatcher(
   @state()
   accessor isHistoryLoading = false;
 
+  @state()
+  accessor showPreviewPanel = false;
+
+  @state()
+  accessor previewPanelContent: TemplateResult<1> | null = null;
+
   private readonly chatMessagesRef: Ref<AIChatMessages> =
     createRef<AIChatMessages>();
 
@@ -311,6 +338,8 @@ export class AIChatContent extends SignalWatcher(
 
   public reset() {
     this.updateContext(DEFAULT_CHAT_CONTEXT_VALUE);
+    this.showPreviewPanel = false;
+    this.previewPanelContent = null;
   }
 
   override connectedCallback() {
@@ -349,7 +378,7 @@ export class AIChatContent extends SignalWatcher(
   }
 
   override render() {
-    return html`${this.chatTitle
+    const left = html`${this.chatTitle
         ? html`<div class="ai-chat-title">${this.chatTitle}</div>`
         : nothing}
       <ai-chat-messages
@@ -399,5 +428,14 @@ export class AIChatContent extends SignalWatcher(
           control: 'chat-send',
         }}
       ></ai-chat-composer>`;
+
+    const right = this.previewPanelContent;
+
+    return html`<chat-panel-split-view
+      .left=${html`<div class="chat-panel-main">${left}</div>`}
+      .right=${right}
+      .open=${this.showPreviewPanel}
+    >
+    </chat-panel-split-view>`;
   }
 }

packages/frontend/core/src/blocksuite/ai/components/ai-tools/artifacts-preview-panel.ts

@@ -5,8 +5,10 @@ import { EmptyIcon } from '@blocksuite/icons/lit';
 import { css, html, nothing, type TemplateResult } from 'lit';
 import { property } from 'lit/decorators.js';
 
+import type { AIChatContent } from '../ai-chat-content';
+
 function getChatPanel(target: HTMLElement) {
-  return target.closest('chat-panel');
+  return target.closest('ai-chat-content') as AIChatContent;
 }
 
 export const isPreviewPanelOpen = (target: HTMLElement) => {

packages/frontend/core/src/desktop/pages/workspace/chat/index.css.ts

@@ -3,9 +3,6 @@ import { style } from '@vanilla-extract/css';
 export const chatRoot = style({
   width: '100%',
   height: '100%',
-  maxWidth: 800,
-  padding: '0px 16px',
-  margin: '0 auto',
 });
 
 export const chatHeader = style({

packages/frontend/core/src/desktop/pages/workspace/chat/index.tsx

@@ -188,16 +188,18 @@ export const Component = () => {
 
     tool.session = currentSession;
 
+    tool.onNewSession = () => {
+      if (!currentSession) return;
+      setCurrentSession(null);
+      chatContent?.reset();
+    };
+
+    tool.onTogglePin = async () => {
+      await togglePin();
+    };
+
     // initial props
     if (!chatTool) {
-      tool.onNewSession = () => {
-        if (!currentSession) return;
-        setCurrentSession(null);
-        chatContent?.reset();
-      };
-      tool.onTogglePin = async () => {
-        await togglePin();
-      };
       // mount
       chatToolContainerRef.current.append(tool);
       setChatTool(tool);