Revert: divisor degrade entre .mm-cat

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/layout/melissa/MelissaMenu.vue

@@ -738,7 +738,6 @@ async function sair() {
 }
 
 .mm-cat {
-    position: relative;
     width: 100%;
     display: flex;
     align-items: center;
@@ -754,21 +753,6 @@ async function sair() {
     font-size: 0.88rem;
     transition: background-color 120ms ease, color 120ms ease;
 }
-/* Divisor com degrade — sai colado na borda esquerda e some no meio */
-.mm-cat:not(:last-child)::after {
-    content: '';
-    position: absolute;
-    left: 0;
-    right: 50%;
-    bottom: -1px;
-    height: 1px;
-    background: linear-gradient(
-        to right,
-        var(--m-border-strong) 0%,
-        transparent 100%
-    );
-    pointer-events: none;
-}
 .mm-cat:hover { background: var(--m-bg-soft); color: var(--m-text); }
 .mm-cat.is-active {
     background: var(--m-bg-soft-hover);