feat(ui): 계좌 선택을 종류→계좌 아코디언(AccountPicker)으로

- AccountPicker.vue: 종류(대분류) 클릭 시 해당 계좌(소분류) 펼침. CategoryPicker 형태
- 정기결제 폼 출금/입금 계좌: 종류칩+시트 → AccountPicker 단일 선택
- 내역 검색 필터 계좌, 상환 대상: AccountPicker 적용(필터는 '전체' 옵션)
- 계좌 많아도 종류별로 접혀 스크롤 최소화

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/views/account/AccountView.vue

@@ -8,6 +8,7 @@ import { appLock } from '@/composables/appLock'
 import IconBtn from '@/components/ui/IconBtn.vue'
 import CategoryPicker from '@/components/ui/CategoryPicker.vue'
 import SheetSelect from '@/components/ui/SheetSelect.vue'
+import AccountPicker from '@/components/ui/AccountPicker.vue'
 import BottomSheet from '@/components/ui/BottomSheet.vue'
 import { imageToBlob, parseReceiptText } from '@/utils/receiptOcr'
 import { cardNotif } from '@/native/cardNotif'
@@ -1047,7 +1048,7 @@ onMounted(async () => {
       />
       <div class="f-sel"><SheetSelect v-model="filters.type" :options="filterTypeOptions" title="구분" placeholder="구분 전체" /></div>
       <div class="f-sel"><SheetSelect v-model="filters.category" :options="filterCategoryOptions" title="분류" placeholder="분류 전체" /></div>
-      <div class="f-sel"><SheetSelect v-model="filters.walletId" :options="filterWalletOptions" title="계좌" placeholder="계좌 전체" /></div>
+      <div class="f-sel"><AccountPicker v-model="filters.walletId" :wallets="wallets" all-label="계좌 전체" title="계좌 선택" /></div>
       <div class="f-sel"><SheetSelect v-model="filters.tagId" :options="filterTagOptions" title="태그" placeholder="태그 전체" /></div>
       <IconBtn icon="search" title="적용" variant="primary" @click="applyFilters" />
       <IconBtn icon="refresh" title="초기화" @click="resetFilters" />
@@ -1238,9 +1239,9 @@ onMounted(async () => {
               <template v-if="isRepayment">
                 <div class="field">
                   <span class="field-label">대상(대출/카드)</span>
-                  <SheetSelect
+                  <AccountPicker
                     v-model="form.toWalletId"
-                    :options="repayTargetOptions"
+                    :wallets="liabilityWallets"
                     :disabled="submitting"
                     title="상환 대상 선택" placeholder="대출/카드를 선택하세요"
                     empty-text="등록된 대출/카드가 없습니다"