feat：新增应急求助副屏 help-monitor + 主屏/心血管副屏导航入口调整（返回主屏按钮位置统一、主屏新增求助副屏入口）

other-module/emergency-screen/xian-center/cv-monitor.html

@@ -106,7 +106,7 @@
     }
     .header__title-text{font-size:22px;font-weight:700;letter-spacing:1.5px;
       background:linear-gradient(90deg,#fff,#8CB8D9);-webkit-background-clip:text;-webkit-text-fill-color:transparent;}
-    .header__left{position:absolute;left:24px;top:50%;transform:translateY(-50%);z-index:2;}
+    .header__left{position:absolute;left:24px;top:50%;transform:translateY(-50%);display:flex;align-items:center;gap:12px;z-index:2;}
     .header__clock{font-size:14px;color:var(--text-sub);font-variant-numeric:tabular-nums;letter-spacing:0.5px;}
     .header__right{position:absolute;right:24px;top:50%;transform:translateY(-50%);display:flex;align-items:center;gap:12px;z-index:2;}
     .header__btn{height:28px;padding:0 14px;border-radius:14px;font-size:11px;cursor:pointer;transition:all .2s;
@@ -455,12 +455,12 @@
   <div class="header__deco header__deco--right"></div>
   <div class="header__left">
     <div class="header__clock" id="clock">--</div>
+    <a class="header__btn header__btn--main" href="index-v3.html">返回主屏</a>
   </div>
   <div class="header__title">
     <span class="header__title-text">西安应急中心 · 心血管监测副屏</span>
   </div>
   <div class="header__right">
-    <a class="header__btn header__btn--main" href="index-v3.html">返回主屏</a>
     <div class="header__runtime">
       <span>系统累计运行</span>
       <span class="header__runtime-num" id="runDays">0</span>

other-module/emergency-screen/xian-center/index-v3.html

@@ -1043,6 +1043,7 @@
   <div class="header__left">
     <div class="header__clock" id="clock">--</div>
     <a class="header__btn header__btn--alarm" href="cv-monitor.html">心血管监测副屏</a>
+    <a class="header__btn header__btn--help" href="help-monitor.html">应急求助副屏</a>
   </div>
   <div class="header__title">
     <span class="header__title-text">西安应急中心大屏</span>