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/stats.js

@@ -147,13 +147,17 @@
             });
     }
 
-    document.addEventListener('DOMContentLoaded', function () {
+    function bootStatsPage() {
         var viewSel = document.getElementById('stats-view-select');
-        if (viewSel) {
+        if (viewSel && !viewSel.dataset.statsBound) {
+            viewSel.dataset.statsBound = '1';
             viewSel.addEventListener('change', function () {
                 renderBreakdown(this.value);
             });
         }
         loadStats();
-    });
+    }
+
+    if (window.qihuoOnPageLoad) window.qihuoOnPageLoad(bootStatsPage);
+    else document.addEventListener('DOMContentLoaded', bootStatsPage);
 })();