ui: 持仓监控卡片与关键位同宽，完善多端与 PWA

改用 split-grid 全宽布局；手机/平板/电脑断点适配；更新 manifest 与 Service Worker 支持安装为 App。

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

static/manifest.json

@@ -1,13 +1,15 @@
 {
+  "id": "/",
   "name": "国内期货交易监控复盘系统",
   "short_name": "期货监控",
   "description": "期货交易监控、持仓管理、复盘与统计分析",
-  "start_url": "/",
+  "start_url": "/login",
   "scope": "/",
   "display": "standalone",
+  "display_override": ["standalone", "browser"],
   "orientation": "any",
-  "background_color": "#050508",
-  "theme_color": "#050508",
+  "background_color": "#e8eef8",
+  "theme_color": "#2563eb",
   "lang": "zh-CN",
   "categories": ["finance", "productivity"],
   "icons": [