fix(DUP-1): remove duplicate search input prefill block -- same code appeared twice with different variable names

frontend/js/app.js

@@ -314,10 +314,6 @@ const Views = {
     const _searchInput = document.getElementById("search-input");
     if (_searchInput && query) _searchInput.value = query;
 
-    // C-01 FIX: pre-fill search input with current query
-    // Users could not see what they searched and could not edit it
-    const _si = document.getElementById("search-input");
-    if (_si && query) _si.value = query;
 
     document.getElementById("search-btn").addEventListener("click", () => {
       const q = document.getElementById("search-input").value.trim();