refactor: centralize common styles and utilities in pmocontrol.css

- Move protocol badge styles to global pmocontrol.css
- Extract .section-title, .icon-btn, and scrollbar utilities into pmocontrol.css
- Add --color-primary-rgb variable for rgba() usage
- Deprecate duplicate .protocol-* and @keyframes spin definitions across components
- Update version to 0.3.29

pmoapp/webapp/src/components/unified/ServerDrawer.vue

@@ -1149,11 +1149,7 @@ function handleSettingsClick() {
     animation: spin 0.8s linear infinite;
 }
 
-@keyframes spin {
-    to {
-        transform: rotate(360deg);
-    }
-}
+/* @keyframes spin is now global in pmocontrol.css */
 
 .loading-state p {
     margin: 0;