feat(ui): 계좌/분류 선택을 바텀시트로 (정기결제 폼)

- BottomSheet.vue: 아래에서 올라오는 콘텐츠 높이 시트(재사용)
- SheetSelect.vue: 필드형 트리거 → 바텀시트 단일 선택(계좌/카드)
- 정기결제 폼: 계좌는 SheetSelect, 분류는 트리거 → 시트 안 CategoryPicker
  (선택 전에는 목록 미노출, 선택 시 값 채움)

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

src/views/account/RecurringFormView.vue

@@ -1,10 +1,11 @@
 <script setup>
-import { computed, onMounted, reactive, ref } from 'vue'
+import { computed, onMounted, reactive, ref, watch } from 'vue'
 import { useRoute, useRouter } from 'vue-router'
 import { accountApi } from '@/api/accountApi'
 import IconBtn from '@/components/ui/IconBtn.vue'
 import CategoryPicker from '@/components/ui/CategoryPicker.vue'
-import ChipSelect from '@/components/ui/ChipSelect.vue'
+import SheetSelect from '@/components/ui/SheetSelect.vue'
+import BottomSheet from '@/components/ui/BottomSheet.vue'
 
 const route = useRoute()
 const router = useRouter()
@@ -16,6 +17,7 @@ const categories = ref([])
 const loading = ref(false)
 const submitting = ref(false)
 const formError = ref(null)
+const catSheet = ref(false)
 
 const form = reactive({
   title: '',
@@ -35,6 +37,8 @@ const form = reactive({
   endDate: '',
   active: true,
 })
+// 분류가 최종 선택(비어있지 않은 값)되면 시트 닫기
+watch(() => form.category, (v) => { if (v) catSheet.value = false })
 
 const TYPES = [
   { value: 'EXPENSE', label: '지출', cls: 'chip-expense' },
@@ -227,11 +231,12 @@ async function submit() {
             @click="form.walletKind = k.value; onWalletKindChange()"
           >{{ k.label }}</button>
         </div>
-        <ChipSelect
+        <SheetSelect
           v-if="form.walletKind"
           v-model="form.walletId"
           :options="fromWalletOptions"
           :disabled="submitting"
+          title="계좌 선택" placeholder="계좌를 선택하세요"
           empty-text="등록된 계좌가 없습니다"
         />
       </div>
@@ -247,18 +252,28 @@ async function submit() {
             @click="form.toWalletKind = k.value; onToWalletKindChange()"
           >{{ k.label }}</button>
         </div>
-        <ChipSelect
+        <SheetSelect
           v-if="form.toWalletKind"
           v-model="form.toWalletId"
           :options="toWalletOptions"
           :disabled="submitting"
+          title="입금 계좌 선택" placeholder="계좌를 선택하세요"
           empty-text="등록된 계좌가 없습니다"
         />
       </div>
 
-      <!-- 분류 — CategoryPicker (이체 제외) -->
+      <!-- 분류 — 트리거 → 바텀시트(CategoryPicker) (이체 제외) -->
       <div v-if="form.type !== 'TRANSFER'" class="field">
         <span class="field-label">분류</span>
+        <button
+          type="button" class="sheet-trigger" :class="{ empty: !form.category }"
+          :disabled="submitting" @click="catSheet = true"
+        >
+          <span class="st-label">{{ form.category || '분류를 선택하세요' }}</span>
+          <span class="st-caret">▾</span>
+        </button>
+      </div>
+      <BottomSheet v-model="catSheet" title="분류 선택">
         <CategoryPicker
           v-model="form.category"
           :type="form.type"
@@ -266,7 +281,7 @@ async function submit() {
           :disabled="submitting"
           @category-added="loadCategories()"
         />
-      </div>
+      </BottomSheet>
 
       <label>메모<input v-model="form.memo" type="text" placeholder="(선택)" :disabled="submitting" /></label>
 
@@ -405,4 +420,37 @@ async function submit() {
   gap: 0.5rem;
   margin-top: 0.5rem;
 }
+/* 분류 시트 트리거(필드형) */
+.sheet-trigger {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 0.5rem;
+  width: 100%;
+  padding: 0.55rem 0.75rem;
+  border: 1px solid var(--color-border);
+  border-radius: 6px;
+  background: var(--color-background-soft);
+  color: var(--color-text);
+  font-size: 0.9rem;
+  cursor: pointer;
+  text-align: left;
+}
+.sheet-trigger:disabled {
+  opacity: 0.5;
+  cursor: not-allowed;
+}
+.sheet-trigger.empty .st-label {
+  opacity: 0.5;
+}
+.st-label {
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+.st-caret {
+  opacity: 0.5;
+  font-size: 0.8rem;
+  flex-shrink: 0;
+}
 </style>