style(ui): 苹果风格二次打磨，统一圆角与材质并移除残留位移动效

- 去除卡片内联硬编码圆角(6px/8px)与固定色值，统一走主题变量与 12px 圆角

- 笔记卡片取消上浮投影，改用按压与填充反馈；版权角标、滚动条、拖拽条改为随主题取色

- 全局补充：遮罩轻微虚化、输入框聚焦光晕、卡片标题排版、选中文本强调色

- 设置卡片的悬停投影改为描边反馈；修正 settings.scss 中无效的 rgb(a, x) 写法

- 服务选择入口去掉 2px 撞色描边与悬停投影，改为细描边与极淡渐变

src/components/InitServiceChooser.vue

@@ -360,11 +360,18 @@ const openClassworksKV = () => {
 .main-service-card {
   min-height: 100px;
   cursor: pointer;
-  transition: all 0.3s ease;
+  transition: background-color 0.22s var(--apple-ease-out),
+    border-color 0.22s var(--apple-ease-out),
+    transform 0.14s var(--apple-ease-out);
 }
 
 .main-service-card:hover {
-  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15) !important;
+  border-color: var(--apple-hairline-strong) !important;
+}
+
+.main-service-card:active {
+  transform: scale(0.995);
+  transition-duration: 0.08s;
 }
 
 .main-service-card .v-card-item {
@@ -386,19 +393,20 @@ const openClassworksKV = () => {
   text-align: left;
 }
 
+/* 三档入口：取自主题强调色，只做极淡的底色渐变与一道细描边 */
 .gradient-new {
-  background: linear-gradient(135deg, rgba(33, 150, 243, .12), rgba(103, 80, 164, 0.08) 60%);
-  border: 2px solid rgba(33, 150, 243, .2);
+  background-image: linear-gradient(135deg, rgba(var(--v-theme-primary), 0.12), transparent 70%);
+  border: 1px solid rgba(var(--v-theme-primary), 0.26);
 }
 
 .gradient-registered {
-  background: linear-gradient(135deg, rgba(76, 175, 80, .12), rgba(0, 184, 212, 0.08) 60%);
-  border: 2px solid rgba(76, 175, 80, .2);
+  background-image: linear-gradient(135deg, rgba(var(--v-theme-success), 0.12), transparent 70%);
+  border: 1px solid rgba(var(--v-theme-success), 0.26);
 }
 
 .gradient-kv {
-  background: linear-gradient(135deg, rgba(0, 184, 212, .12), rgba(33, 150, 243, 0.08) 60%);
-  border: 2px solid rgba(0, 184, 212, .2);
+  background-image: linear-gradient(135deg, rgba(var(--v-theme-info), 0.12), transparent 70%);
+  border: 1px solid rgba(var(--v-theme-info), 0.26);
 }
 
 /* 其他选项 */