fix(js): clear interval handles when polling stops

Keep data-slhx-every timers separate from debounce/throttle timers and delete the interval handle when a polling element leaves the document, so reinserted elements can start polling again without leaking stale timer state.

req: convention/005

slhx-js/runtime/slhx.js

@@ -8,6 +8,7 @@
   const pending = new WeakMap();
   const queues = new WeakMap();
   const timers = new WeakMap();
+  const everyTimers = new WeakMap();
   const pendingClassStates = new WeakMap();
   const indicatorStates = new WeakMap();
   const disabledStates = new WeakMap();
@@ -621,13 +622,18 @@
 
   function bindPolling(root) {
     forEachElement(root, (el) => {
-      if (!el.hasAttribute("data-slhx-every") || timers.has(el)) return;
+      if (!el.hasAttribute("data-slhx-every") || everyTimers.has(el)) return;
       const ms = duration(el.getAttribute("data-slhx-every"));
       if (!ms) return;
-      timers.set(el, setInterval(() => document.contains(el) ? send(el, "every") : clearInterval(timers.get(el)), ms));
+      everyTimers.set(el, setInterval(() => document.contains(el) ? send(el, "every") : stopPolling(el), ms));
     });
   }
 
+  function stopPolling(el) {
+    clearInterval(everyTimers.get(el));
+    everyTimers.delete(el);
+  }
+
   function bindSse(root) {
     const url = root.getAttribute("data-slhx-sse");
     if (!url || sseSources.has(root) || typeof EventSource === "undefined") return;