message: fix: node select background color
diff: >
  <template v-slot:item="{ item }">
  <tr
  - :style="{cursor:'pointer', background: selectedNode === item ? '#eee' : 'none'}"
  + :style="{cursor:'pointer', background: selectedNode === item ? $vuetify.theme.themes.light.accent : 'none'}"
  @click.stop="selectNode(item)"
  >
  <td>{{ item.node_id }}</td>
  