improvement(wrapped-ui): 完善 Win98 主题的可视化适配并优化聊天回放信息区

- ChatReplayAnimation：时间戳移到顶栏，简化气泡尾巴；补齐 Game Boy/DOS/Win98 顶栏文案颜色与边框风格
- 热力图：新增 win98 配色分支，并为 heatmap/legend 单元加硬边框
- Overview/MessageChars 等可视化补充 Win98 主题样式（键盘/进度条/雷达图等）

frontend/components/wrapped/visualizations/GlobalOverviewChart.vue

@@ -377,4 +377,51 @@ const labels = computed(() => {
   color: #33ff33 !important;
   text-shadow: 0 0 5px #33ff33;
 }
+
+/* ========== Win98 主题 ========== */
+.wrapped-theme-win98 .overview-card {
+  background: #c0c0c0 !important;
+  border: 1px solid #808080 !important;
+  border-radius: 0 !important;
+  backdrop-filter: none;
+  box-shadow:
+    inset 1px 1px 0 #ffffff,
+    inset -1px -1px 0 #000000;
+}
+
+.wrapped-theme-win98 .overview-progress-bg {
+  background: #ffffff !important;
+  border-radius: 0 !important;
+  border: 1px solid #808080;
+  box-shadow:
+    inset 1px 1px 0 #000000,
+    inset -1px -1px 0 #ffffff;
+}
+
+.wrapped-theme-win98 .overview-progress-fill {
+  background: #000080 !important;
+  border-radius: 0 !important;
+}
+
+.wrapped-theme-win98 .overview-grid-line {
+  stroke: rgba(0, 0, 0, 0.22);
+}
+
+.wrapped-theme-win98 .overview-axis-line {
+  stroke: rgba(0, 0, 0, 0.35);
+}
+
+.wrapped-theme-win98 .overview-data-polygon {
+  fill: rgba(0, 0, 128, 0.16);
+  stroke: #000080;
+}
+
+.wrapped-theme-win98 .overview-data-node {
+  fill: #000080;
+  stroke: #ffffff;
+}
+
+.wrapped-theme-win98 .overview-label {
+  fill: rgba(0, 0, 0, 0.8);
+}
 </style>