style(web): 薰衣草主题背景下沉与卡片阴影、面板紧凑度微调

- 主区背景下沉至约 92% 明度，卡片/KPI 改用更明显的紫色投影并上浮
- 修复 Dashboard 在 route-page flex 下被压扁导致快捷入口被裁切
- 车辆监控面板紧凑化

Co-authored-by: Cursor <cursoragent@cursor.com>

frontends/apps/simple-platform-vue/src/components/workbench/VehicleMonitorPanel.vue

@@ -285,22 +285,23 @@ function detailIdForCar(car: Car): string {
 .vehicle-monitor {
   display: flex;
   flex-direction: column;
-  gap: 10px;
+  gap: 6px;
   min-height: 0;
   height: 100%;
+  overflow: hidden;
 }
 
 .overview-row {
   display: grid;
   grid-template-columns: repeat(5, 1fr);
-  gap: 6px;
+  gap: 4px;
   flex: none;
 }
 .overview-item {
   background: var(--mg-veil-1);
   border: 1px solid var(--mg-veil-border);
-  border-radius: 8px;
-  padding: 6px 4px;
+  border-radius: 6px;
+  padding: 4px 2px;
   text-align: center;
   transition: var(--mg-transition, all 0.2s ease);
 }
@@ -309,7 +310,7 @@ function detailIdForCar(car: Car): string {
   border-color: rgba(var(--mg-accent-rgb, 142, 200, 252), 0.4);
 }
 .overview-num {
-  font-size: 18px;
+  font-size: 15px;
   font-weight: 600;
   color: var(--mg-text-light);
   line-height: 1.2;
@@ -333,24 +334,25 @@ function detailIdForCar(car: Car): string {
 .toolbar .filter { width: 100px; flex: none; }
 
 .vehicle-list {
-  flex: 1;
+  flex: 1 1 0;
   min-height: 0;
   overflow-y: auto;
   display: flex;
   flex-direction: column;
-  gap: 6px;
+  gap: 4px;
   padding-right: 2px;
 }
 
 .vehicle-row {
   background: var(--mg-veil-1);
   border: 1px solid var(--mg-veil-border);
-  border-radius: 6px;
-  padding: 6px 8px;
+  border-radius: 4px;
+  padding: 4px 6px;
   cursor: pointer;
   display: flex;
   flex-direction: column;
-  gap: 3px;
+  gap: 2px;
+  flex: none;
   transition: all 0.18s ease;
 }
 .vehicle-row:hover {
@@ -369,7 +371,7 @@ function detailIdForCar(car: Car): string {
   gap: 6px;
 }
 .vid {
-  font-size: 11.5px;
+  font-size: 10.5px;
   color: var(--mg-text-muted);
   font-family: ui-monospace, 'SFMono-Regular', 'Menlo', monospace;
   flex: none;
@@ -379,7 +381,7 @@ function detailIdForCar(car: Car): string {
   min-width: 0;
   color: var(--mg-text-light);
   font-weight: 600;
-  font-size: 12.5px;
+  font-size: 11.5px;
   overflow: hidden;
   text-overflow: ellipsis;
   white-space: nowrap;
@@ -413,8 +415,8 @@ function detailIdForCar(car: Car): string {
 .vehicle-sub {
   display: flex;
   align-items: center;
-  gap: 10px;
-  font-size: 11.5px;
+  gap: 6px;
+  font-size: 10.5px;
 }
 .battery-mini {
   display: flex;