unified how panel-footer works between regular timelines and user timeline

src/components/user_profile/user_profile.vue

@@ -56,6 +56,7 @@
           :user-id="userId"
           :pinned-status-ids="user.pinnedStatusIds"
           :in-profile="true"
+          :footerSlipgate="footerRef"
         />
         <div
           v-if="followsTabVisible"
@@ -94,6 +95,7 @@
           :timeline="media"
           :user-id="userId"
           :in-profile="true"
+          :footerSlipgate="footerRef"
         />
         <Timeline
           v-if="isUs"
@@ -105,8 +107,10 @@
           timeline-name="favorites"
           :timeline="favorites"
           :in-profile="true"
+          :footerSlipgate="footerRef"
         />
       </tab-switcher>
+      <div class="panel-footer" :ref="setFooterRef"></div>
     </div>
     <div
       v-else