improvement(wrapped): 清理主题系统，Wrapped 固定 Modern

- 移除 useWrappedTheme 与主题切换入口（仅保留 Modern 视觉）

- 封面/卡片/年份选择器/热力图等组件去掉 Win98/Gameboy/DOS 分支与样式

- 删除 themedHeatColor、CRT/像素字体相关样式，降低维护成本

frontend/components/wrapped/visualizations/GlobalOverviewChart.vue

@@ -268,160 +268,4 @@ const labels = computed(() => {
 .overview-progress-fill {
   @apply h-full rounded-full bg-[#07C160];
 }
-
-/* ========== Game Boy 主题 ========== */
-
-.wrapped-theme-gameboy .overview-card {
-  background: #8bac0f !important;
-  border: 4px solid #306230 !important;
-  border-radius: 0 !important;
-  backdrop-filter: none;
-  box-shadow:
-    inset -2px -2px 0 0 #306230,
-    inset 2px 2px 0 0 #c5d870;
-}
-
-.wrapped-theme-gameboy .overview-progress-bg {
-  background: #306230 !important;
-  border-radius: 0 !important;
-}
-
-.wrapped-theme-gameboy .overview-progress-fill {
-  background: #0f380f !important;
-  border-radius: 0 !important;
-}
-
-.wrapped-theme-gameboy .overview-grid-line {
-  stroke: #306230;
-  stroke-opacity: 0.4;
-}
-
-.wrapped-theme-gameboy .overview-axis-line {
-  stroke: #306230;
-  stroke-opacity: 0.5;
-}
-
-.wrapped-theme-gameboy .overview-data-polygon {
-  fill: rgba(15, 56, 15, 0.3);
-  stroke: #0f380f;
-}
-
-.wrapped-theme-gameboy .overview-data-node {
-  fill: #0f380f;
-  stroke: #9bbc0f;
-}
-
-.wrapped-theme-gameboy .overview-label {
-  fill: #0f380f;
-}
-
-.wrapped-theme-gameboy .wrapped-label,
-.wrapped-theme-gameboy .wrapped-body {
-  color: #306230 !important;
-}
-
-.wrapped-theme-gameboy .wrapped-number {
-  color: #0f380f !important;
-}
-
-/* ========== DOS 主题 ========== */
-
-.wrapped-theme-dos .overview-card {
-  background: #0a0a0a !important;
-  border: 1px solid #33ff33 !important;
-  box-shadow: 0 0 10px rgba(51, 255, 51, 0.2);
-  backdrop-filter: none;
-}
-
-.wrapped-theme-dos .overview-grid-line {
-  stroke: #33ff33;
-  stroke-opacity: 0.2;
-}
-
-.wrapped-theme-dos .overview-axis-line {
-  stroke: #33ff33;
-  stroke-opacity: 0.3;
-}
-
-.wrapped-theme-dos .overview-data-polygon {
-  fill: rgba(51, 255, 51, 0.15);
-  stroke: #33ff33;
-}
-
-.wrapped-theme-dos .overview-data-node {
-  fill: #33ff33;
-  stroke: #0a0a0a;
-}
-
-.wrapped-theme-dos .overview-label {
-  fill: #33ff33;
-}
-
-.wrapped-theme-dos .overview-progress-bg {
-  background: #1a1a1a !important;
-  border: 1px solid #33ff33;
-}
-
-.wrapped-theme-dos .overview-progress-fill {
-  background: #33ff33 !important;
-  box-shadow: 0 0 5px #33ff33;
-}
-
-.wrapped-theme-dos .wrapped-label,
-.wrapped-theme-dos .wrapped-body {
-  color: #22aa22 !important;
-  text-shadow: 0 0 3px #22aa22;
-}
-
-.wrapped-theme-dos .wrapped-number {
-  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>