Remove sidebar-upgrade-btn highlight; blend Upgrade button with other sidebar buttons

Agent-Logs-Url: https://github.com/naturallaw777/staging_alpha/sessions/13a21819-24b1-4aee-b9fa-1e6830992e53

Co-authored-by: naturallaw777 <99053422+naturallaw777@users.noreply.github.com>

app/sovran_systemsos_web/static/css/layout.css

@@ -84,23 +84,6 @@
   margin: 16px 0;
 }
 
-/* ── Sidebar: Upgrade button (Node role) ────────────────────────── */
-
-.sidebar-upgrade-btn {
-  border-color: var(--accent-color);
-  background-color: rgba(94, 173, 138, 0.06);
-  margin-top: 8px;
-}
-
-.sidebar-upgrade-btn:hover {
-  background-color: rgba(94, 173, 138, 0.14);
-  border-color: var(--accent-color);
-}
-
-.sidebar-upgrade-btn .sidebar-support-hint {
-  color: var(--accent-color);
-}
-
 /* ── Upgrade modal ──────────────────────────────────────────────── */
 
 .upgrade-dialog {

app/sovran_systemsos_web/static/js/tiles.js

@@ -104,7 +104,7 @@ function renderSidebarSupport(supportServices) {
   // ── Upgrade button (Node role only)
   if (_currentRole === "node") {
     var upgradeBtn = document.createElement("button");
-    upgradeBtn.className = "sidebar-support-btn sidebar-upgrade-btn";
+    upgradeBtn.className = "sidebar-support-btn";
     upgradeBtn.innerHTML =
       '<span class="sidebar-support-icon">🚀</span>' +
       '<span class="sidebar-support-text">' +