feat(travel): 지도 핀 마커 + 위치 지정 모달 (Phase 2)

MiniMap에 Point geometry 핀 마커 렌더링, 앨범 지역 변경 후
"위치 지정" 버튼으로 RegionPinPicker 모달을 열어 좌표 저장.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/pages/travel/AlbumDetail.css

@@ -106,6 +106,12 @@
   opacity: 0.6;
 }
 
+.album-detail__region-row {
+  display: flex;
+  align-items: center;
+  gap: 6px;
+}
+
 .album-detail__region-ok {
   color: #c8905e;
 }
@@ -113,6 +119,28 @@
   color: #dc5050;
 }
 
+.album-detail__pin-btn {
+  display: inline-flex;
+  align-items: center;
+  gap: 3px;
+  padding: 2px 8px;
+  border-radius: 3px;
+  border: 1px solid var(--tv-line-bright, rgba(232, 221, 208, 0.22));
+  background: transparent;
+  color: var(--tv-muted, rgba(232, 221, 208, 0.45));
+  font-family: var(--tv-mono, 'SF Mono', 'Fira Code', monospace);
+  font-size: 9px;
+  letter-spacing: 0.06em;
+  cursor: pointer;
+  transition: border-color 0.2s, color 0.2s, background 0.2s;
+  white-space: nowrap;
+}
+.album-detail__pin-btn:hover {
+  border-color: #c8905e;
+  color: #c8905e;
+  background: rgba(200, 144, 94, 0.08);
+}
+
 /* ── Region editor ── */
 .album-detail__region-editor {
   position: relative;