fix(js): release superseded latest pending state

When data-slhx-policy=latest aborts an in-flight request, release that request's pending UI bookkeeping before starting the replacement request so pending classes, indicators, and disabled controls do not leak.

req: convention/006

req: convention/007

slhx-js/tests/runtime.rs

@@ -143,6 +143,15 @@ fn runtime_supports_queued_request_policy() {
     assert!(source.contains("const base = queues.get(target) || active.done"));
 }
 
+#[test]
+fn runtime_latest_request_policy_releases_superseded_pending_state() {
+    // req: convention/006 req: convention/007
+    let source = slhx_js::RUNTIME_JS;
+
+    assert!(source.contains("if (active && policy === \"latest\") {\n      active.abort.abort();\n      showPending(target, false);\n    }"));
+    assert!(source.contains("if (pending.get(target)?.abort === abort)"));
+}
+
 #[test]
 fn runtime_exposes_page_swap_hooks() {
     let source = slhx_js::RUNTIME_JS;