only show interface after theme has been applied

src/modules/instance.js

@@ -386,6 +386,7 @@ const instance = {
           } else {
             applyTheme(themeData.theme)
           }
+          commit('setThemeApplied')
         })
     },
     fetchEmoji ({ dispatch, state }) {

src/modules/interface.js

@@ -1,4 +1,5 @@
 const defaultState = {
+  themeApplied: false,
   settingsModalState: 'hidden',
   settingsModalLoadedUser: false,
   settingsModalLoadedAdmin: false,
@@ -35,6 +36,9 @@ const interfaceMod = {
         state.settings.currentSaveStateNotice = { error: true, errorData: error }
       }
     },
+    setThemeApplied (state) {
+      state.themeApplied = true
+    },
     setNotificationPermission (state, permission) {
       state.notificationPermission = permission
     },