Speed up top nav with turbo routing and external base CSS.

Remove view-transition lag, swap main content without full reload, prefetch pages, and tear down SSE timers on leave.

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

static/js/symbol.js

@@ -261,12 +261,14 @@
         });
     }
 
-    document.addEventListener('DOMContentLoaded', function () {
+    function initSymbolForms() {
         document.querySelectorAll('.symbol-wrap').forEach(initSymbolInput);
 
         document.querySelectorAll('form').forEach(function (form) {
             if (!form.querySelector('.symbol-wrap')) return;
             if (form.id === 'market-form') return;
+            if (form.dataset.symbolGuard) return;
+            form.dataset.symbolGuard = '1';
             form.addEventListener('submit', function (e) {
                 const ths = form.querySelector('input[name="symbol"]')
                     || form.querySelector('.symbol-ths-code');
@@ -282,5 +284,8 @@
                 }
             });
         });
-    });
+    }
+
+    if (window.qihuoOnPageLoad) window.qihuoOnPageLoad(initSymbolForms);
+    else document.addEventListener('DOMContentLoaded', initSymbolForms);
 })();