scroll_to_bottom_button: Use unicode icon for right arrow.

static/js/ui_init.js

@@ -203,7 +203,9 @@ function initialize_compose_box() {
             embedded: $("#compose").attr("data-embedded") === "",
             file_upload_enabled: page_params.max_file_upload_size_mib > 0,
             giphy_enabled: giphy.is_giphy_enabled(),
-            scroll_to_bottom_key: common.has_mac_keyboard() ? "Fn + Right arrow" : "End",
+            scroll_to_bottom_key: common.has_mac_keyboard()
+                ? "Fn + <span class='tooltip_right_arrow'>→</span>"
+                : "End",
         }),
     );
     $(`.enter_sends_${user_settings.enter_sends}`).show();

static/styles/zulip.css

@@ -3146,3 +3146,9 @@ select.inline_select_topic_edit {
         }
     }
 }
+
+.tooltip_right_arrow {
+    position: relative;
+    top: -1px;
+    font-weight: 600;
+}