支持在线时间跨天并优化发布与筛选体验

允许在线时段 end 早于 start 表示跨天，统一展示「次日」文案；修复移动端价格区间清空后被 sessionStorage 回写；优化 PC/移动端在线时间控件密度与通栏展示。

frontend/src/features/seller/views/SellerListingCreateView.css

@@ -369,20 +369,20 @@
 }
 
 .online-time-row {
-  align-items: center;
+  align-items: start;
+}
+
+.online-time-body {
+  display: flex;
+  flex-direction: column;
+  gap: 6px;
+  min-width: 0;
 }
 
 .online-time-controls {
   display: flex;
   flex-wrap: wrap;
   align-items: center;
-  gap: 10px;
-  min-width: 0;
-}
-
-.online-time-range {
-  display: flex;
-  align-items: center;
   gap: 8px;
   min-width: 0;
 }
@@ -390,14 +390,40 @@
 .online-time-sep {
   flex: 0 0 auto;
   color: #94a3b8;
-  font-size: 13px;
+  font-size: 12px;
   font-weight: 700;
+  line-height: 1;
+}
+
+.online-time-next-day {
+  flex: 0 0 auto;
+  padding: 2px 6px;
+  border-radius: 999px;
+  background: rgba(255, 106, 0, 0.12);
+  color: #ff6a00;
+  font-size: 11px;
+  font-style: normal;
+  font-weight: 800;
+  line-height: 1.2;
+}
+
+.online-time-summary {
+  margin: 0;
+  color: #64748b;
+  font-size: 12px;
+  font-weight: 500;
+  line-height: 1.4;
+}
+
+.online-time-body > .field-hint {
+  grid-column: auto;
+  margin: 0;
 }
 
 .time-chip {
   flex: 0 0 auto;
   min-height: 32px;
-  padding: 0 14px;
+  padding: 0 12px;
   border: 1px solid #d6dce5;
   border-radius: 999px;
   background: #fff;
@@ -423,11 +449,47 @@
 }
 
 .time-input {
-  width: 128px;
+  width: 112px;
 }
 
-.online-time-range :deep(.el-input__wrapper) {
+.online-time-controls :deep(.el-date-editor.el-input),
+.online-time-controls :deep(.el-date-editor.el-input__wrapper) {
+  height: 32px;
+  width: 112px;
+}
+
+.online-time-controls :deep(.el-input__wrapper) {
+  min-height: 32px;
+  height: 32px;
+  padding: 0 10px;
   border-radius: 999px;
+  box-shadow: 0 0 0 1px #d6dce5 inset;
+  background: #fff;
+}
+
+.online-time-controls :deep(.el-input__wrapper:hover) {
+  box-shadow: 0 0 0 1px #c4ccd8 inset;
+}
+
+.online-time-controls :deep(.el-input__wrapper.is-focus) {
+  box-shadow: 0 0 0 1px var(--color-orange-primary) inset;
+}
+
+.online-time-controls :deep(.time-input.is-cross .el-input__wrapper) {
+  box-shadow: 0 0 0 1px rgba(255, 106, 0, 0.4) inset;
+  background: #fffaf5;
+}
+
+.online-time-controls :deep(.el-input__inner) {
+  height: 30px;
+  font-size: 13px;
+  font-weight: 700;
+  font-variant-numeric: tabular-nums;
+  color: #30343a;
+}
+
+.online-time-controls :deep(.el-input__prefix) {
+  color: #94a3b8;
 }
 
 .login-region-panel {
@@ -938,14 +1000,17 @@
     grid-template-columns: 1fr;
   }
 
-  .online-time-range {
+  .online-time-controls {
     width: 100%;
   }
 
   .time-input {
-    flex: 1;
-    width: auto;
-    min-width: 0;
+    width: 104px;
+  }
+
+  .online-time-controls :deep(.el-date-editor.el-input),
+  .online-time-controls :deep(.el-date-editor.el-input__wrapper) {
+    width: 104px;
   }
 
   .field-hint {