feat: 新增预算助手报告组件并优化报销交互细节

新增预算助手报告视图模型和组件，优化报销洞察面板和消息项
样式细节，完善预算中心页面布局和文档中心视图，增强报销创
建会话管理和提交编排器，调整 Vite 构建配置，补充单元测试。

web/src/assets/styles/components/travel-reimbursement-insight-panel.css

@@ -43,6 +43,21 @@
   pointer-events: none;
 }
 
+.el-fade-in-linear-enter-active,
+.el-fade-in-linear-leave-active {
+  transition: opacity 200ms linear;
+}
+
+.el-fade-in-linear-enter-from,
+.el-fade-in-linear-leave-to {
+  opacity: 0;
+}
+
+.el-fade-in-linear-enter-to,
+.el-fade-in-linear-leave-from {
+  opacity: 1;
+}
+
 .insight-head {
   display: grid;
   gap: 12px;
@@ -401,11 +416,6 @@
   color: #cbd5e1;
 }
 
-.flow-step-item.completed .flow-step-status.completed {
-  background: rgba(255, 255, 255, 0.14);
-  color: #ffffff;
-}
-
 .flow-step-item.running .flow-step-rail span {
   border-color: #2563eb;
   background: #2563eb;
@@ -429,32 +439,6 @@
   background: #fef2f2;
 }
 
-.flow-step-reveal-enter-active,
-.flow-step-reveal-leave-active {
-  transition:
-    opacity 0.24s ease,
-    transform 0.28s ease,
-    filter 0.28s ease;
-}
-
-.flow-step-reveal-enter-from,
-.flow-step-reveal-leave-to {
-  opacity: 0;
-  filter: blur(2px);
-  transform: translateY(-8px);
-}
-
-.flow-step-reveal-enter-to,
-.flow-step-reveal-leave-from {
-  opacity: 1;
-  filter: blur(0);
-  transform: translateY(0);
-}
-
-.flow-step-reveal-move {
-  transition: transform 0.24s ease;
-}
-
 .flow-empty-state,
 .review-side-empty,
 .review-document-preview-placeholder {

web/src/assets/styles/components/travel-reimbursement-message-item.css

@@ -54,6 +54,10 @@
   max-width: min(100%, 980px);
 }
 
+.message-bubble-budget-report {
+  max-width: min(100%, 1080px);
+}
+
 .message-bubble-review-risk-low,
 .message-bubble-review-risk-medium,
 .message-bubble-review-risk-high {
@@ -487,6 +491,38 @@
   opacity: 0.42;
 }
 
+.application-preview-footer {
+  margin-top: 48px;
+  color: #334155;
+  font-size: var(--wb-fs-bubble, 13px);
+  font-weight: 760;
+  line-height: 1.7;
+}
+
+.application-preview-footer.message-answer-markdown :deep(p) {
+  margin: 0;
+}
+
+.message-answer-markdown :deep(a) {
+  color: var(--theme-primary-active, #255b7d);
+  font-weight: 850;
+  text-decoration: underline;
+  text-decoration-thickness: 1.5px;
+  text-underline-offset: 3px;
+}
+
+.message-answer-markdown :deep(a:hover) {
+  color: var(--theme-primary, #3a7ca5);
+}
+
+.message-answer-markdown :deep(.markdown-action-link) {
+  color: var(--theme-primary-active, #255b7d);
+  font-weight: 880;
+  text-decoration: underline;
+  text-decoration-thickness: 1.6px;
+  text-underline-offset: 3px;
+}
+
 .application-preview-footer-missing {
   display: flex;
   flex-wrap: wrap;