increase column header font size for readability

- bump .mr-missing-browser .mr-column-header from 10px to 15px
- bump #model-resolver-modal .mr-missing-detail-pane .mr-column-header from 11px to 15px

web/css/resolver-main.css

@@ -1685,7 +1685,7 @@
     padding-bottom: 8px;
     border-bottom: 1px solid var(--mr-missing-line, var(--mr-divider));
     color: #bdbdbd;
-    font-size: 10px;
+    font-size: 15px;
     letter-spacing: 0.08em;
 }
 
@@ -8689,7 +8689,7 @@ a.mr-image-preview-resource-name:hover {
     padding-bottom: 10px;
     color: #c3c3c3;
     border-bottom-color: rgba(255, 255, 255, 0.075);
-    font-size: 11px;
+    font-size: 15px;
     letter-spacing: 0.075em;
 }