use a bit more compact layout on mobile

src/components/timeline/timeline.js

@@ -1,4 +1,5 @@
 import Status from '../status/status.vue'
+import { mapState } from 'vuex'
 import timelineFetcher from '../../services/timeline_fetcher/timeline_fetcher.service.js'
 import Conversation from '../conversation/conversation.vue'
 import TimelineMenu from '../timeline_menu/timeline_menu.vue'
@@ -6,11 +7,15 @@ import QuickFilterSettings from '../quick_filter_settings/quick_filter_settings.
 import QuickViewSettings from '../quick_view_settings/quick_view_settings.vue'
 import { debounce, throttle, keyBy } from 'lodash'
 import { library } from '@fortawesome/fontawesome-svg-core'
-import { faCircleNotch, faCog } from '@fortawesome/free-solid-svg-icons'
+import { faCircleNotch, faCirclePlus, faCog, faMinus, faArrowUp, faCheck } from '@fortawesome/free-solid-svg-icons'
 
 library.add(
   faCircleNotch,
-  faCog
+  faCog,
+  faMinus,
+  faArrowUp,
+  faCirclePlus,
+  faCheck
 )
 
 const Timeline = {
@@ -88,7 +93,10 @@ const Timeline = {
     },
     virtualScrollingEnabled () {
       return this.$store.getters.mergedConfig.virtualScrolling
-    }
+    },
+    ...mapState({
+      mobileLayout: state => state.interface.layoutType === 'mobile',
+    })
   },
   created () {
     const store = this.$store