feat(language-server): understand the api binding attribute

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

packages/language-server/src/server.ts

@@ -26,6 +26,7 @@ import {
   htmlHover,
   htmlLinkedEditingRanges,
   htmlTagComplete,
+  isApiAttributeValuePosition,
   mergeCompletions,
 } from "./html-service.ts";
 import { clearHtmlRegionCache } from "./html-regions.ts";
@@ -288,6 +289,10 @@ async function handle(message: JsonRpc): Promise<void> {
         result(message.id, apiCallCompletions(document.text));
         break;
       }
+      if (document && isApiAttributeValuePosition(document, params.position)) {
+        result(message.id, apiCallCompletions(document.text));
+        break;
+      }
       const wrnexus = [...completionItems(), ...workspaceCompletionItems(workspaceRoot)];
       const html = document ? htmlCompletions(document, params.position) : [];
       result(message.id, html.length ? mergeCompletions(wrnexus, html) : wrnexus);