首页工作流执行：表单默认收起可展开、节点执行过程可视化（仿豆包）、失败支持重新执行/重新编辑、错误信息去重

- 提交后表单卡片默认收起（仅显示工作流标题），头部加明确展开/收起按钮
- node_start/node_complete 事件驱动节点步骤流，执行过程区仿豆包竖向展示
- 失败卡片拆分「重新执行」（复用已填值直接重跑）与「重新编辑」两按钮
- 失败消息只显示「❌ 执行失败」，错误详情由卡片 footer 展示，避免双处重复

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

src/views/home/components/MainContent.vue

@@ -13,6 +13,7 @@
 				@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)"
 				@form-re-edit="(msg: any) => emit('form-re-edit', msg)"
 				@form-cancel="(msg: any) => emit('form-cancel', msg)"
 				@output-preview="(msg: any, output: any) => emit('output-preview', msg, output)"
@@ -71,6 +72,7 @@ interface Emits {
 	(e: 'workflow-select', id: string, isTemplate?: boolean): void;
 	(e: 'delete', msg: any): void;
 	(e: 'form-submit', msg: any, payload: any): void;
+	(e: 'form-retry', msg: any, payload: any): void;
 	(e: 'form-re-edit', msg: any): void;
 	(e: 'form-cancel', msg: any): void;
 	(e: 'output-preview', msg: any, output: any): void;