feat(subscription): 모바일 반응형 — 바텀시트 필터 + FAB

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

src/pages/subscription/Subscription.css

@@ -1161,4 +1161,20 @@
     .sub-tabs-bar { flex-direction: column; align-items: flex-start; }
     .sub-sched-row { grid-template-columns: 90px 10px 1fr; gap: 0 10px; }
     .sub-compare__row { grid-template-columns: 70px 1fr 1fr 16px; }
+
+    /* 공고 카드 1컬럼 */
+    .sub-card-grid {
+        grid-template-columns: 1fr;
+    }
+
+    /* 탭 가로 스크롤 */
+    .sub-tabs {
+        overflow-x: auto;
+        -webkit-overflow-scrolling: touch;
+    }
+
+    .sub-tabs > * {
+        flex-shrink: 0;
+        white-space: nowrap;
+    }
 }