fix(06.2): WR-06 use URLSearchParams in listShares for consistent encoding

frontend/src/api/client.js

@@ -350,7 +350,8 @@ export function updateSharePermission(shareId, permission) {
 }
 
 export function listShares(docId) {
-  return request(`/api/shares?document_id=${docId}`)
+  const params = new URLSearchParams({ document_id: docId })
+  return request(`/api/shares?${params}`)
 }
 
 export function deleteShare(shareId) {