Fix: pattern regex v-flag, help mobile: TOC accordion not slide-over, search always in TOC

frontend/style.css

@@ -2193,9 +2193,6 @@ select {
   margin-right: 8px;
 }
 .help-hamburger:hover { color: var(--accent); border-color: var(--accent); }
-.help-nav-overlay {
-  display: none;
-}
 .help-nav {
   width: 260px;
   min-width: 260px;
@@ -2227,19 +2224,6 @@ select {
   letter-spacing: 0.05em;
   color: var(--text-muted);
 }
-.help-nav-close {
-  display: none;
-  width: 32px; height: 32px;
-  padding: 0;
-  border: 1px solid var(--border);
-  border-radius: 6px;
-  background: transparent;
-  color: var(--text-secondary);
-  cursor: pointer;
-  align-items: center;
-  justify-content: center;
-}
-.help-nav-close:hover { color: var(--accent); border-color: var(--accent); }
 .help-nav-search-wrap {
   padding: 0 12px 8px;
   flex-shrink: 0;
@@ -6449,49 +6433,28 @@ body.popup-mode .content-area {
     border-radius: 0;
   }
 
-  /* Hamburger visible on mobile */
   .help-hamburger {
     display: inline-flex;
   }
 
-  /* TOC: slide-over from left */
-  .help-nav-overlay {
-    display: block;
-    position: fixed;
-    inset: 0;
-    background: rgba(0,0,0,0.5);
-    z-index: 1100;
-    opacity: 0;
-    pointer-events: none;
-    transition: opacity 0.25s ease;
-  }
-  .help-nav-overlay.visible {
-    opacity: 1;
-    pointer-events: auto;
-  }
-
+  /* TOC: collapsible block at top (not slide-over) */
   .help-nav {
-    position: fixed;
-    top: 0;
-    left: 0;
-    bottom: 0;
-    width: 280px;
-    min-width: 280px;
-    max-height: 100vh;
-    height: 100vh;
-    z-index: 1200;
-    transform: translateX(-100%);
-    transition: transform 0.25s ease;
-    border-right: 1px solid var(--border);
-    box-shadow: 2px 0 16px rgba(0,0,0,0.3);
+    position: static;
+    width: 100%;
+    min-width: 100%;
+    max-height: none;
+    height: auto;
+    z-index: auto;
+    transform: none;
+    transition: none;
+    border-right: none;
+    border-bottom: 1px solid var(--border);
+    box-shadow: none;
     flex-shrink: 0;
+    display: none;  /* hidden by default on mobile */
   }
-  .help-nav.open {
-    transform: translateX(0);
-  }
-
-  .help-nav-close {
-    display: inline-flex;
+  .help-nav-header {
+    padding: 10px 16px 6px;
   }
 
   /* Content full-width */