feat(miniprogram): migrate reimburse apply list/form/detail from bx-mobile.

Reuse /reimburses APIs with bx envelope; support multi-line details and draft actions.

Co-authored-by: Cursor <cursoragent@cursor.com>

miniprogram/utils/bxFormat.js

@@ -85,3 +85,67 @@ export function formatApplyDateTime(row) {
 export function formatApplyDate(row) {
   return formatDate(pickApplyTime(row))
 }
+
+/** 费用树扁平化（tree → flatList） */
+export function flattenExpenseTree(tree) {
+  const result = []
+  for (const node of tree || []) {
+    result.push(node)
+    if (node.children?.length) result.push(...flattenExpenseTree(node.children))
+  }
+  return result
+}
+
+export function normalizeExpenseItem(raw) {
+  const children = Array.isArray(raw?.children)
+    ? raw.children.map(normalizeExpenseItem)
+    : undefined
+  return {
+    id: String(raw?.id ?? ''),
+    parentId: raw?.parentId == null || raw?.parentId === '' ? '0' : String(raw.parentId),
+    itemName: raw?.itemName ?? '',
+    itemCode: raw?.itemCode ?? '',
+    level: Number(raw?.level ?? 0),
+    sortOrder: Number(raw?.sortOrder ?? 0),
+    status: raw?.status,
+    childCount: Number(raw?.childCount ?? children?.length ?? 0),
+    children
+  }
+}
+
+export function formatExpenseName(id, flatList) {
+  if (id == null || id === '') return '-'
+  const sid = String(id)
+  const parts = []
+  let cur = (flatList || []).find((i) => String(i.id) === sid)
+  const guard = new Set()
+  while (cur && !guard.has(cur.id)) {
+    guard.add(cur.id)
+    parts.unshift(cur.itemName)
+    const pid = cur.parentId
+    cur =
+      pid != null && pid !== '' && pid !== '0'
+        ? (flatList || []).find((i) => String(i.id) === pid)
+        : undefined
+  }
+  return parts.length ? parts.join('/') : '-'
+}
+
+export function pickExpenseItemId(row) {
+  if (!row || typeof row !== 'object') return null
+  const raw = row.expenseId ?? row.expense_id ?? row.expenseItemId ?? row.expense_item_id
+  if (raw == null || raw === '') return null
+  return String(raw)
+}
+
+export function resolveExpenseDisplay(row, flatList) {
+  if (!row) return '-'
+  const id = pickExpenseItemId(row)
+  const nameFb = row.expenseName ?? row.expense_name
+  if (id != null && flatList && flatList.length) {
+    const p = formatExpenseName(id, flatList)
+    if (p && p !== '-') return p
+  }
+  const fb = nameFb != null ? String(nameFb).trim() : ''
+  return fb || '-'
+}