Fix turbo nav for settings and stats pages.

Extract settings.js, preserve inline scripts from raw HTML (DOMParser strips them), and load trade config via JSON script tag.

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

static/js/stats.js

@@ -138,8 +138,11 @@
     }
 
     function loadStats() {
-        fetch('/api/stats')
-            .then(function (r) { return r.json(); })
+        fetch('/api/stats', { credentials: 'same-origin' })
+            .then(function (r) {
+                if (!r.ok) throw new Error('HTTP ' + r.status);
+                return r.json();
+            })
             .then(applyData)
             .catch(function () {
                 var updated = document.getElementById('stats-updated');
@@ -148,6 +151,7 @@
     }
 
     function bootStatsPage() {
+        if (!document.getElementById('stats-summary')) return;
         var viewSel = document.getElementById('stats-view-select');
         if (viewSel && !viewSel.dataset.statsBound) {
             viewSel.dataset.statsBound = '1';