Add confirm dialogs and busy states for swap/transfer all actions.

Use available (free) balances for full-amount ops, support sub-account scope, and show clear success/failure feedback.

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

lib/instance/templates/embed_shell.html

@@ -7,7 +7,7 @@
     <link rel="stylesheet" href="/static/instance_theme_early.css?v=4">
     <link rel="stylesheet" href="/static/account_risk_badge.css?v=4">
     <link rel="stylesheet" href="/static/instance_page.css?v=6">
-    <link rel="stylesheet" href="/static/instance_theme.css?v=79">
+    <link rel="stylesheet" href="/static/instance_theme.css?v=80">
     <script src="/static/account_risk_badge.js?v=4"></script>
     <meta name="theme-color" content="#0b0d14">
     <title>{{ exchange_display }} · 加密货币 | 交易监控复盘系统</title>

lib/instance/templates/index.html

@@ -17,7 +17,7 @@
     <link rel="manifest" href="/static/icons/manifest.webmanifest">
     <title>{{ exchange_display }} · 加密货币 | 交易监控复盘系统</title>
     <link rel="stylesheet" href="/static/instance_page.css?v=3">
-    <link rel="stylesheet" href="/static/instance_theme.css?v=79">
+    <link rel="stylesheet" href="/static/instance_theme.css?v=80">
 
 </head>
 <body