feat(hub): mobile AI one-screen and dashboard monitor counts

Fix mobile AI to scroll only in the chat area. Dashboard cards show monitor item counts with expand-to-fullscreen and color-coded position floating P&L.

manual_trading_hub/static/app.css

@@ -3821,6 +3821,8 @@ html[data-theme="light"] button.danger {
 /* --- Hub AI 教练（整页一屏，内容区内滚动）--- */
 body.hub-page-ai {
   overflow: hidden;
+  height: 100dvh;
+  max-height: 100dvh;
 }
 body.hub-page-ai .app-shell {
   padding-bottom: 12px;
@@ -3831,6 +3833,13 @@ body.hub-page-ai .app-shell {
   flex-direction: column;
   box-sizing: border-box;
 }
+body.hub-page-ai .app-shell > #page-ai {
+  flex: 1 1 auto;
+  min-height: 0;
+  display: flex;
+  flex-direction: column;
+  overflow: hidden;
+}
 body.hub-page-ai .app-header {
   flex-shrink: 0;
   margin-bottom: 4px;
@@ -3876,6 +3885,11 @@ body.hub-page-ai #page-ai {
 
 /* 手机 AI：须在 .ai-layout 双列定义之后，避免被覆盖成半屏 */
 @media (max-width: 720px) {
+  html:has(body.hub-page-ai) {
+    height: 100%;
+    overflow: hidden;
+  }
+
   body.hub-page-ai .app-shell {
     padding-bottom: max(8px, env(safe-area-inset-bottom));
     height: var(--hub-vvh, 100dvh);
@@ -3888,8 +3902,24 @@ body.hub-page-ai #page-ai {
   }
 
   body.hub-page-ai {
+    position: fixed;
+    inset: 0;
+    width: 100%;
     overflow: hidden;
     background: var(--bg);
+    overscroll-behavior: none;
+  }
+
+  body.hub-page-ai .app-header {
+    padding: 6px 0;
+    margin-bottom: 2px;
+    gap: 8px;
+  }
+
+  body.hub-page-ai .top-nav a {
+    min-height: 34px;
+    padding: 6px 10px;
+    font-size: 11px;
   }
 
   body.hub-page-ai.hub-ai-keyboard-open .app-header,
@@ -4062,8 +4092,19 @@ body.hub-page-ai #page-ai {
   body.hub-page-ai .ai-chat-messages {
     flex: 1 1 auto;
     min-height: 0;
+    max-height: none;
     padding: 4px 2px 8px;
+    overflow-x: hidden;
     overflow-y: auto;
+    overscroll-behavior: contain;
+    -webkit-overflow-scrolling: touch;
+  }
+
+  body.hub-page-ai .ai-layout[data-ai-mobile-tab="history"] .ai-chat-history-list {
+    flex: 1 1 auto;
+    min-height: 0;
+    overflow-y: auto;
+    overscroll-behavior: contain;
     -webkit-overflow-scrolling: touch;
   }