feat(travel): 앨범 지역 편집 UI — 텍스트 입력 + 자동완성

- AlbumDetail 헤더의 지역 라벨 클릭 → 인라인 편집 모드
- 기존 지역 목록 자동완성 제안 + 새 지역명 직접 입력 가능
- Enter/클릭으로 저장, Esc/✕로 취소
- PUT /api/travel/albums/{album}/region 호출 → 앨범 목록 갱신

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/pages/travel/AlbumDetail.css

@@ -85,6 +85,111 @@
   width: fit-content;
 }
 
+.album-detail__region--editable {
+  border: 1px solid transparent;
+  cursor: pointer;
+  display: inline-flex;
+  align-items: center;
+  gap: 4px;
+  transition: border-color 0.2s, background 0.2s;
+}
+.album-detail__region--editable:hover {
+  border-color: var(--tv-line-bright, rgba(232, 221, 208, 0.22));
+  background: var(--tv-surface-2, #221c14);
+}
+
+.album-detail__region-edit-icon {
+  opacity: 0;
+  transition: opacity 0.2s;
+}
+.album-detail__region--editable:hover .album-detail__region-edit-icon {
+  opacity: 0.6;
+}
+
+.album-detail__region-ok {
+  color: #c8905e;
+}
+.album-detail__region-err {
+  color: #dc5050;
+}
+
+/* ── Region editor ── */
+.album-detail__region-editor {
+  position: relative;
+  display: flex;
+  align-items: center;
+  gap: 4px;
+}
+
+.album-detail__region-input {
+  font-family: var(--tv-mono, 'SF Mono', 'Fira Code', monospace);
+  font-size: 11px;
+  letter-spacing: 0.04em;
+  color: var(--tv-text, #e8ddd0);
+  background: var(--tv-surface-2, #221c14);
+  border: 1px solid var(--tv-line-bright, rgba(232, 221, 208, 0.22));
+  border-radius: 4px;
+  padding: 4px 8px;
+  width: 160px;
+  outline: none;
+}
+.album-detail__region-input:focus {
+  border-color: var(--tv-accent, #c8905e);
+}
+
+.album-detail__region-suggestions {
+  position: absolute;
+  top: 100%;
+  left: 0;
+  z-index: 10;
+  margin: 4px 0 0;
+  padding: 4px 0;
+  list-style: none;
+  background: var(--tv-surface, #1a1510);
+  border: 1px solid var(--tv-line-bright, rgba(232, 221, 208, 0.22));
+  border-radius: 6px;
+  max-height: 180px;
+  overflow-y: auto;
+  min-width: 160px;
+  scrollbar-width: thin;
+}
+
+.album-detail__region-suggestion {
+  display: block;
+  width: 100%;
+  padding: 6px 12px;
+  font-family: var(--tv-mono, 'SF Mono', 'Fira Code', monospace);
+  font-size: 11px;
+  color: var(--tv-text, #e8ddd0);
+  background: none;
+  border: none;
+  cursor: pointer;
+  text-align: left;
+  transition: background 0.15s;
+}
+.album-detail__region-suggestion:hover {
+  background: var(--tv-line, rgba(232, 221, 208, 0.1));
+}
+
+.album-detail__region-cancel {
+  width: 22px;
+  height: 22px;
+  border-radius: 50%;
+  border: none;
+  background: var(--tv-line, rgba(232, 221, 208, 0.1));
+  color: var(--tv-muted, rgba(232, 221, 208, 0.45));
+  font-size: 10px;
+  cursor: pointer;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  flex-shrink: 0;
+  transition: background 0.15s;
+}
+.album-detail__region-cancel:hover {
+  background: var(--tv-line-bright, rgba(232, 221, 208, 0.22));
+}
+
 .album-detail__count {
   font-family: var(--tv-mono, 'SF Mono', 'Fira Code', monospace);
   font-size: 11px;