fix: Modals titles nested headers and header nested buttons errors (#2019)

src/styles/global.scss

@@ -140,6 +140,11 @@
   background-size: 60px 60px;
 }
 
+.mantine-Modal-title {
+  font-size: 1.375rem;
+  font-weight: 700;
+}
+
 .tiptap {
   hr {
     border-top-style: double;