fix(core): ai chat panel content will be inconsistent when switching to journals (#9288)

Fix issue [BS-2153](https://linear.app/affine-design/issue/BS-2153).

Optimize DOM reuse by explicitly providing an identifier (similar to React's key).

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

@@ -255,13 +255,19 @@ export class ChatPanelMessages extends WithDisposable(ShadowlessElement) {
               </div>
               ${this._renderAIOnboarding()}
             </div> `
-          : repeat(filteredItems, (item, index) => {
+          : repeat(
-              const isLast = index === filteredItems.length - 1;
+              filteredItems,
-              return html`<div class="message">
+              item => ('role' in item ? item.id : item.sessionId),
-                ${this.renderAvatar(item)}
+              (item, index) => {
-                <div class="item-wrapper">${this.renderItem(item, isLast)}</div>
+                const isLast = index === filteredItems.length - 1;
-              </div>`;
+                return html`<div class="message">
-            })}
+                  ${this.renderAvatar(item)}
+                  <div class="item-wrapper">
+                    ${this.renderItem(item, isLast)}
+                  </div>
+                </div>`;
+              }
+            )}
         <chat-cards
           .updateContext=${this.updateContext}
           .host=${this.host}