use auto-fill instead of fixed column count

src/App.scss

@@ -339,8 +339,6 @@ nav {
     grid-template-areas: "content";
     padding: 0;
 
-    --_actionsColumnCount: 3;
-
     .column {
       padding-top: 0;
       margin: var(--navbar-height) 0 0 0;

src/components/status_action_buttons/status_action_buttons.scss

@@ -3,7 +3,7 @@
 .StatusActionButtons {
   .quick-action-buttons {
     display: grid;
-    grid-template-columns: repeat(var(--_actionsColumnCount, 6), 1fr);
+    grid-template-columns: repeat(auto-fill, 6em);
     grid-auto-flow: row dense;
     grid-auto-rows: 1fr;
     grid-gap: 1.25em 1em;

src/components/user_card/user_card.scss

@@ -292,10 +292,6 @@
   }
 }
 
-#sidebar {
-  --_actionsColumnCount: 4;
-}
-
 .sidebar .edit-profile-button {
   display: none;
 }