Fix: hamburger first-click, add search clear X button

frontend/style.css

@@ -2227,10 +2227,13 @@ select {
 .help-nav-search-wrap {
   padding: 0 12px 8px;
   flex-shrink: 0;
+  position: relative;
+  display: flex;
+  align-items: center;
 }
 .help-nav-search {
   width: 100%;
-  padding: 7px 10px;
+  padding: 7px 30px 7px 10px;
   border: 1px solid var(--border);
   border-radius: 8px;
   background: var(--bg-primary);
@@ -2243,6 +2246,31 @@ select {
   border-color: var(--accent);
 }
 .help-nav-search::placeholder { color: var(--text-muted); }
+.help-search-clear {
+  position: absolute;
+  right: 18px;
+  top: 50%;
+  transform: translateY(-50%);
+  width: 20px; height: 20px;
+  padding: 0;
+  border: none;
+  background: transparent;
+  color: var(--text-muted);
+  cursor: pointer;
+  font-size: 12px;
+  line-height: 1;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  border-radius: 50%;
+  opacity: 0.6;
+  transition: opacity 0.15s, color 0.15s;
+}
+.help-search-clear:hover {
+  opacity: 1;
+  color: var(--text-primary);
+  background: rgba(255,255,255,0.08);
+}
 .help-nav-list {
   list-style: none;
   margin: 0;