feat(messages): 补齐 PC 消息中心通知与已读操作

frontend/src/styles/pc-messages.css

@@ -424,3 +424,89 @@
     flex-basis: 100%;
   }
 }
+
+.pc-messages-tabs {
+  margin-bottom: 16px;
+}
+
+.pc-messages-tabs .ant-tabs-nav {
+  margin-bottom: 0;
+}
+
+.pc-notice-list {
+  display: flex;
+  flex-direction: column;
+}
+
+.pc-notice-row {
+  display: flex;
+  align-items: flex-start;
+  gap: 12px;
+  width: 100%;
+  padding: 16px 20px;
+  border: 0;
+  border-bottom: 1px solid var(--line);
+  background: transparent;
+  color: inherit;
+  text-align: left;
+  cursor: pointer;
+  transition: background 0.2s ease;
+}
+
+.pc-notice-row:last-child {
+  border-bottom: 0;
+}
+
+.pc-notice-row:hover {
+  background: var(--paper-warm);
+}
+
+.pc-notice-row__dot {
+  flex: 0 0 8px;
+  width: 8px;
+  height: 8px;
+  margin-top: 7px;
+  border-radius: 50%;
+  background: var(--line);
+}
+
+.pc-notice-row--unread .pc-notice-row__dot {
+  background: var(--brand-seal);
+  box-shadow: 0 0 0 3px rgba(166, 67, 50, 0.12);
+}
+
+.pc-notice-row__body {
+  flex: 1;
+  min-width: 0;
+}
+
+.pc-notice-row__top {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 12px;
+}
+
+.pc-notice-row__top strong {
+  color: var(--ink);
+  font-size: 14px;
+  font-weight: 600;
+}
+
+.pc-notice-row__top small {
+  flex: 0 0 auto;
+  color: var(--ink-muted);
+  font-size: 11px;
+}
+
+.pc-notice-row__content {
+  display: -webkit-box;
+  overflow: hidden;
+  margin-top: 5px;
+  color: var(--ink-secondary);
+  font-size: 13px;
+  line-height: 1.7;
+  white-space: pre-wrap;
+  -webkit-box-orient: vertical;
+  -webkit-line-clamp: 2;
+}