首页：删除气泡重新生成功能

- 移除失败气泡与 AI/用户消息操作栏的重新生成入口
- 清理 retry/regenerate 事件链、handleRetry 及 retryQuestion 字段
- 保留失败/空回复提示文本、复制与删除操作

Co-Authored-By: Claude <noreply@anthropic.com>

src/views/home/components/MainContent.vue

@@ -10,8 +10,6 @@
 				:loading-more="loadingMore"
 				:execute-request="executeRequest"
 				class="chat-list-scroll"
-				@retry="emit('retry', $event)"
-				@regenerate="emit('regenerate', $event)"
 				@delete="emit('delete', $event)"
 				@form-submit="(msg: any, payload: any) => emit('form-submit', msg, payload)"
 				@form-retry="(msg: any, payload: any) => emit('form-retry', msg, payload)"
@@ -70,8 +68,6 @@ interface Props {
 }
 
 interface Emits {
-	(e: 'retry', msg: any): void;
-	(e: 'regenerate', msg: any): void;
 	(e: 'workflow-select', id: string, isTemplate?: boolean): void;
 	(e: 'delete', msg: any): void;
 	(e: 'form-submit', msg: any, payload: any): void;