diff --git a/web/src/services/orchestrator.js b/web/src/services/orchestrator.js
index 2dd6733..3d40d49 100644
--- a/web/src/services/orchestrator.js
+++ b/web/src/services/orchestrator.js
@@ -7,13 +7,16 @@ export function runOrchestrator(payload) {
   })
 }
 
-export function fetchLatestConversation(userId, sessionType = '') {
+export function fetchLatestConversation(userId, sessionType = '', options = {}) {
   const params = new URLSearchParams({
     user_id: String(userId || '').trim()
   })
   if (String(sessionType || '').trim()) {
     params.set('session_type', String(sessionType || '').trim())
   }
+  if (options.preferRecoverable) {
+    params.set('prefer_recoverable', 'true')
+  }
 
   return apiRequest(`/orchestrator/conversations/latest?${params.toString()}`)
 }
diff --git a/web/src/services/reimbursements.js b/web/src/services/reimbursements.js
index daf4de3..a82143d 100644
--- a/web/src/services/reimbursements.js
+++ b/web/src/services/reimbursements.js
@@ -36,12 +36,37 @@ export function fetchExpenseClaimItemAttachmentMeta(claimId, itemId) {
   return apiRequest(`/reimbursements/claims/${encodeURIComponent(String(claimId || '').trim())}/items/${encodeURIComponent(String(itemId || '').trim())}/attachment/meta`)
 }
 
+export function fetchExpenseClaimItemAttachmentPreview(claimId, itemId) {
+  return apiRequest(`/reimbursements/claims/${encodeURIComponent(String(claimId || '').trim())}/items/${encodeURIComponent(String(itemId || '').trim())}/attachment/preview`, {
+    responseType: 'blob'
+  })
+}
+
 export function fetchExpenseClaimItemAttachment(claimId, itemId) {
   return apiRequest(`/reimbursements/claims/${encodeURIComponent(String(claimId || '').trim())}/items/${encodeURIComponent(String(itemId || '').trim())}/attachment`, {
     responseType: 'blob'
   })
 }
 
+export async function fetchExpenseClaimAttachmentAsset(pathOrUrl) {
+  const target = String(pathOrUrl || '').trim()
+  if (!target) {
+    throw new Error('预览地址为空。')
+  }
+
+  if (/^https?:\/\//i.test(target)) {
+    const response = await fetch(target)
+    if (!response.ok) {
+      throw new Error(`预览加载失败（${response.status}）。`)
+    }
+    return response.blob()
+  }
+
+  return apiRequest(target, {
+    responseType: 'blob'
+  })
+}
+
 export function deleteExpenseClaimItemAttachment(claimId, itemId) {
   return apiRequest(`/reimbursements/claims/${encodeURIComponent(String(claimId || '').trim())}/items/${encodeURIComponent(String(itemId || '').trim())}/attachment`, {
     method: 'DELETE'