Live-read all DOM attributes: forms and preloads too

bindBoostForm re-reads method/action at submit time.
bind-preload-for re-reads verb-info and headers at preload time.
No closed-over stale values anywhere in the event binding system.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

shared/static/scripts/sx-browser.js

@@ -14,7 +14,7 @@
   // =========================================================================
 
   var NIL = Object.freeze({ _nil: true, toString: function() { return "nil"; } });
-  var SX_VERSION = "2026-03-07T02:03:55Z";
+  var SX_VERSION = "2026-03-07T02:10:28Z";
 
   function isNil(x) { return x === NIL || x === null || x === undefined; }
   function isSxTruthy(x) { return x !== false && !isNil(x); }
@@ -2185,14 +2185,12 @@ return postSwap(target); })) : NIL);
   var bindPreloadFor = function(el) { return (function() {
   var preloadAttr = domGetAttr(el, "sx-preload");
   return (isSxTruthy(preloadAttr) ? (function() {
-  var info = getVerbInfo(el);
-  return (isSxTruthy(info) ? (function() {
-  var url = get(info, "url");
-  var headers = buildRequestHeaders(el, loadedComponentNames(), _cssHash);
   var events = (isSxTruthy((preloadAttr == "mousedown")) ? ["mousedown", "touchstart"] : ["mouseover"]);
   var debounceMs = (isSxTruthy((preloadAttr == "mousedown")) ? 0 : 100);
-  return bindPreload(el, events, debounceMs, function() { return doPreload(url, headers); });
-})() : NIL);
+  return bindPreload(el, events, debounceMs, function() { return (function() {
+  var info = getVerbInfo(el);
+  return (isSxTruthy(info) ? doPreload(get(info, "url"), buildRequestHeaders(el, loadedComponentNames(), _cssHash)) : NIL);
+})(); });
 })() : NIL);
 })(); };
 
@@ -3460,11 +3458,14 @@ callExpr.push(dictGet(kwargs, k)); } }
     });
   }
 
-  function bindBoostForm(form, method, action) {
+  function bindBoostForm(form, _method, _action) {
     form.addEventListener("submit", function(e) {
       e.preventDefault();
-      executeRequest(form, { method: method, url: action }).then(function() {
-        try { history.pushState({ sxUrl: action, scrollY: window.scrollY }, "", action); } catch (err) {}
+      // Re-read from element at submit time
+      var liveMethod = (form.getAttribute("method") || _method || "GET").toUpperCase();
+      var liveAction = form.getAttribute("action") || _action || location.href;
+      executeRequest(form, { method: liveMethod, url: liveAction }).then(function() {
+        try { history.pushState({ sxUrl: liveAction, scrollY: window.scrollY }, "", liveAction); } catch (err) {}
       });
     });
   }

shared/sx/ref/bootstrap_js.py

@@ -2731,11 +2731,14 @@ PLATFORM_ORCHESTRATION_JS = """
     });
   }
 
-  function bindBoostForm(form, method, action) {
+  function bindBoostForm(form, _method, _action) {
     form.addEventListener("submit", function(e) {
       e.preventDefault();
-      executeRequest(form, { method: method, url: action }).then(function() {
-        try { history.pushState({ sxUrl: action, scrollY: window.scrollY }, "", action); } catch (err) {}
+      // Re-read from element at submit time
+      var liveMethod = (form.getAttribute("method") || _method || "GET").toUpperCase();
+      var liveAction = form.getAttribute("action") || _action || location.href;
+      executeRequest(form, { method: liveMethod, url: liveAction }).then(function() {
+        try { history.pushState({ sxUrl: liveAction, scrollY: window.scrollY }, "", liveAction); } catch (err) {}
       });
     });
   }

shared/sx/ref/orchestration.sx

@@ -780,17 +780,18 @@
     ;; Bind preload event listeners based on sx-preload attribute
     (let ((preload-attr (dom-get-attr el "sx-preload")))
       (when preload-attr
-        (let ((info (get-verb-info el)))
-          (when info
-            (let ((url (get info "url"))
-                  (headers (build-request-headers el
-                             (loaded-component-names) _css-hash))
-                  (events (if (= preload-attr "mousedown")
-                            (list "mousedown" "touchstart")
-                            (list "mouseover")))
-                  (debounce-ms (if (= preload-attr "mousedown") 0 100)))
-              (bind-preload el events debounce-ms
-                (fn () (do-preload url headers))))))))))
+        (let ((events (if (= preload-attr "mousedown")
+                        (list "mousedown" "touchstart")
+                        (list "mouseover")))
+              (debounce-ms (if (= preload-attr "mousedown") 0 100)))
+          ;; Re-read verb info and headers at preload time, not bind time
+          (bind-preload el events debounce-ms
+            (fn ()
+              (let ((info (get-verb-info el)))
+                (when info
+                  (do-preload (get info "url")
+                    (build-request-headers el
+                      (loaded-component-names) _css-hash)))))))))))
 
 
 (define do-preload