settings: Abbreviate long bot owner names in bot management modal.

Previously, long owner names could wrap onto two lines in the bot
management modal, breaking the layout. This commit adds CSS to keep
names on a single line and abbreviate with an ellipsis if too long.

Fixes #23266.

web/styles/app_components.css

@@ -1137,6 +1137,12 @@ input.settings_text_input {
     }
 }
 
+#edit_bot_owner_widget .dropdown_widget_value {
+    white-space: nowrap;
+    overflow: hidden;
+    text-overflow: ellipsis;
+}
+
 .dropdown_widget_with_label_wrapper {
     margin-top: 0 !important;
 }