Wire token-budget packing into the overview/rerank fallback path

apps/web/app/_components/Composer.tsx

@@ -40,20 +40,36 @@ export function Composer({
     }
   }, [initialValue]);
 
-  // Fetch suggestions from API route when query length > 1
+  // Fetch suggestions from API route when query length > 1.
+  //
+  // `term` is the LAST WORD being typed, not the whole textarea — a natural
+  // sentence like "cho tôi thuốc parace" has no drug alias containing that
+  // full phrase, so matching against it always returns empty (found live
+  // 2026-08-10: this silently killed every suggestion once a user typed a
+  // sentence instead of a bare drug name, which is the more common case).
   useEffect(() => {
-    const term = value.trim();
+    const words = value.trim().split(/\s+/);
+    const term = words[words.length - 1] ?? "";
     if (term.length < 2) {
       setSuggestions([]);
       setShowSuggestions(false);
       return;
     }
 
+    // Race guard: a slower request for an earlier keystroke must not
+    // overwrite a faster one for a later keystroke — found live 2026-08-10
+    // typing fast could show a stale, unrelated suggestion list because the
+    // fetch callback set state unconditionally regardless of whether `term`
+    // (and therefore `value`) had already changed by the time it resolved.
+    let cancelled = false;
+
     const timer = setTimeout(async () => {
       try {
         const res = await fetch(`/api/suggest?q=${encodeURIComponent(term)}`);
+        if (cancelled) return;
         if (res.ok) {
           const data = await res.json();
+          if (cancelled) return;
           if (data?.suggestions && Array.isArray(data.suggestions) && data.suggestions.length > 0) {
             setSuggestions(data.suggestions);
             setShowSuggestions(true);
@@ -64,15 +80,21 @@ export function Composer({
         const filtered = SAMPLE_SUGGESTIONS.filter((s) =>
           s.toLowerCase().includes(term.toLowerCase())
         );
+        if (cancelled) return;
         setSuggestions(filtered);
         setShowSuggestions(filtered.length > 0);
       } catch {
-        setSuggestions([]);
-        setShowSuggestions(false);
+        if (!cancelled) {
+          setSuggestions([]);
+          setShowSuggestions(false);
+        }
       }
     }, 200);
 
-    return () => clearTimeout(timer);
+    return () => {
+      cancelled = true;
+      clearTimeout(timer);
+    };
   }, [value]);
 
   // Close suggestions on outside click