style(simple-modal): adjust heading styles for improved readability

style(toast-container): reduce gap between toast items for better spacing

src/app/shared/components/simple-modal/simple-modal.component.scss

@@ -11,6 +11,11 @@
   line-height: 1.5;
 }
 
+h2.simple-modal__content {
+  font-size: 15px;
+  font-weight: bold;
+}
+
 .simple-modal__actions {
   display: flex;
   justify-content: center;