fix(sidebar): centrar label con display:block+text-align:center, chevron absolute

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

shared/components/sidebar.php

@@ -317,12 +317,11 @@ if (class_exists('ModuleRegistry', false)) {
 /* ── Acordeón de categorías ─────────────────────────── */
 .sidebar-section {
     position: relative;
-    display: flex;
-    align-items: center;
-    justify-content: center;
+    display: block;
+    text-align: center;
     cursor: pointer;
     user-select: none;
-    padding: 8px 28px 6px;
+    padding: 8px 30px 6px;
     margin-top: 6px;
     border-radius: 8px 8px 0 0;
     transition: background .15s, border-color .15s;
@@ -339,15 +338,17 @@ if (class_exists('ModuleRegistry', false)) {
     background: rgba(255,255,255,.1);
     color: #fff;
 }
-.sidebar-section .sb-cat-label { display:flex; align-items:center; gap:5px; }
+.sidebar-section .sb-cat-label { display:inline-flex; align-items:center; gap:5px; }
 .sb-chevron {
     position: absolute;
     right: 12px;
+    top: 50%;
+    transform: translateY(-50%);
     font-size: .6rem;
     opacity: .6;
     transition: transform .25s ease;
 }
-.sidebar-section.collapsed .sb-chevron { transform: rotate(-90deg); }
+.sidebar-section.collapsed .sb-chevron { transform: translateY(-50%) rotate(-90deg); }
 
 /* Grupo colapsable */
 .sb-group { overflow: hidden; transition: max-height .28s ease, opacity .2s ease; }