fix(ui): alignments for the editing heading block within the table view container

src/main/frontend/components/block.css

@@ -526,38 +526,40 @@
 
 .ls-block h1,
 .editor-inner .h1.uniline-block {
-  font-size: 2em;
+  font-size: 2rem;
   min-height: 1.5em;
+  line-height: 1.38em;
 }
 
 .ls-block h2,
 .editor-inner .h2.uniline-block {
-  font-size: 1.5em;
+  font-size: 1.5rem;
   min-height: 1.5em;
+  line-height: 1.38em;
 }
 
 .ls-block h3,
 .editor-inner .h3.uniline-block {
-  font-size: 1.2em;
+  font-size: 1.2rem;
   min-height: 1.2em;
 }
 
 .ls-block h4,
 .editor-inner .h4.uniline-block {
-  font-size: 1em;
+  font-size: 1rem;
   min-height: 1em;
 }
 
 .ls-block h5,
 .editor-inner .h5.uniline-block {
-  font-size: 0.83em;
+  font-size: 0.83rem;
   min-height: 0.83em;
 }
 
 .ls-block h6,
 .editor-inner .h6.uniline-block {
-  font-size: 0.75em;
-  min-height: 0.75em;
+  font-size: 0.75rem;
+  min-height: 0.75rem;
 }
 
 .ls-block :is(h1, h2, h3, h4, h5, h6),