refactor admin navigation; update links to ingest pages and improve loading of data in parallel

public/admin/assets/js/articles.js

@@ -24,9 +24,12 @@ async function loadSources() {
 
 
 function getFilters() {
+  const sel = document.getElementById("f-source");
   return {
     keyword:        document.getElementById("f-keyword").value.trim(),
-    source:         document.getElementById("f-source").value,
+    // fall back to url when the dropdown hasn't populated yet —
+    // lets us fire loadArticles in parallel with loadSources on init
+    source:         sel.value || queryGet("source"),
     content_status: document.getElementById("f-status").value,
     from:           document.getElementById("f-from").value,
     to:             document.getElementById("f-to").value,
@@ -184,6 +187,7 @@ document.addEventListener("DOMContentLoaded", async () => {
     }
   };
 
-  await loadSources();   // wait for dropdown to render the saved source selection
-  loadArticles();
+  // both calls can run concurrently — loadArticles falls back to the
+  // url param for source until the dropdown finishes populating.
+  await Promise.all([loadSources(), loadArticles()]);
 });