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/views/scripts/TravelReimbursementCreateView.js

@@ -618,6 +618,7 @@ export default {
     const {
       flowRunId,
       flowSteps,
+      activeFlowSteps,
       visibleFlowSteps,
       flowRefreshBusy,
       completedFlowStepCount,
@@ -677,7 +678,7 @@ export default {
     })
     const hasQueryInsight = computed(() => Boolean(currentInsight.value.agent?.queryPayload))
     const hasInsightPanelContent = computed(() => {
-      return isKnowledgeSession.value || hasScopedReviewPayload.value || hasQueryInsight.value || flowSteps.value.length > 0
+      return isKnowledgeSession.value || hasScopedReviewPayload.value || hasQueryInsight.value || activeFlowSteps.value.length > 0
     })
     const showInsightPanel = computed(() => hasInsightPanelContent.value && !insightPanelCollapsed.value)
     const insightPanelToggleLabel = computed(() =>
@@ -696,6 +697,9 @@ export default {
       if (activeSessionType.value === SESSION_TYPE_APPROVAL) {
         return '例如：查一下待我审核的单据，或帮我生成这张单据的审核意见。'
       }
+      if (activeSessionType.value === SESSION_TYPE_BUDGET) {
+        return '例如：查询市场部 Q1 预算编制情况，重点看差旅、通信、招待费和办公用品。'
+      }
       return '例如：查一下近10日报销金额、解释酒店超标风险，或根据附件整理报销核对信息。'
     })
     const currentIntentLabel = computed(() => {
@@ -807,7 +811,7 @@ export default {
       activeReviewPayload,
       activeReviewPanelScope,
       reviewFilePreviews,
-      flowSteps,
+      flowSteps: activeFlowSteps,
       submitting,
       reviewActionBusy,
       triggerFileUpload: (...args) => triggerFileUpload(...args),
@@ -1087,15 +1091,19 @@ export default {
     })
     const isReviewOverviewDrawer = computed(() => reviewDrawerMode.value === REVIEW_DRAWER_MODE_REVIEW)
 
-    const shortcuts = computed(() =>
-      filterAssistantSessionModes(ASSISTANT_SESSION_MODE_OPTIONS, currentUser.value).map((mode) => ({
+    const shortcuts = computed(() => {
+      const accessibleModes = filterAssistantSessionModes(ASSISTANT_SESSION_MODE_OPTIONS, currentUser.value)
+      const visibleModes = props.entrySource === 'budget'
+        ? accessibleModes.filter((mode) => mode.key === SESSION_TYPE_BUDGET)
+        : accessibleModes
+      return visibleModes.map((mode) => ({
         label: mode.label,
         icon: mode.icon,
         action: 'switch_view',
         targetSessionType: mode.key,
         active: mode.key === activeSessionType.value
       }))
-    )
+    })
     watch(
       () => [activeReviewPayload.value, activeReviewPanelScope.value],
       ([payload]) => {
@@ -1103,7 +1111,7 @@ export default {
         // reviewDrawerMode.value = resolveReviewRiskBriefs(payload).length
         //   ? REVIEW_DRAWER_MODE_RISK
         //   : REVIEW_DRAWER_MODE_REVIEW
-        const shouldKeepFlowDrawer = reviewDrawerMode.value === REVIEW_DRAWER_MODE_FLOW && flowSteps.value.length > 0
+        const shouldKeepFlowDrawer = reviewDrawerMode.value === REVIEW_DRAWER_MODE_FLOW && activeFlowSteps.value.length > 0
         resetReviewDrawerFromPayload(payload)
         if (shouldKeepFlowDrawer) {
           reviewDrawerMode.value = REVIEW_DRAWER_MODE_FLOW
@@ -1148,6 +1156,17 @@ export default {
       }
     )
 
+    watch(
+      () => [activeSessionType.value, activeFlowSteps.value.length],
+      ([, activeCount], [, previousActiveCount] = []) => {
+        if (activeCount <= 0 || previousActiveCount > 0) {
+          return
+        }
+        reviewDrawerMode.value = REVIEW_DRAWER_MODE_FLOW
+        insightPanelCollapsed.value = false
+      }
+    )
+
     watch(
       () => composerDraft.value,
       () => {
@@ -1664,6 +1683,9 @@ export default {
     }
 
     function buildMessageBubbleClass(message) {
+      if (message?.role === 'assistant' && message?.budgetReport) {
+        return 'message-bubble-budget-report'
+      }
       if (message?.role === 'assistant' && message?.applicationPreview) {
         return 'message-bubble-application-preview'
       }
@@ -2217,7 +2239,7 @@ export default {
       flowRunId: flowRunId.value,
       flowRefreshBusy: flowRefreshBusy.value,
       refreshFlowRunDetail,
-      flowSteps: flowSteps.value,
+      flowSteps: activeFlowSteps.value,
       visibleFlowSteps: visibleFlowSteps.value,
       resolveFlowStepStatusLabel,
       formatFlowStepDuration,