CLDR-17658 Improve Dashboard performance and UI; work in progress

-For now, change only the front end

-Combine notifications in certain categories so that there is not more than one per page

-For now, apply this to both Missing and Abstained categories; easy to change which categories are affected

-Try to fix delayed visibility of checkbox click; alternatives and debugging for catCheckmarkChanged

-Remove delay from a-spin pending solution to delayed visibility of checkbox click

-Add Vue version to the About page; bugs may depend on Vue version

tools/cldr-apps/js/src/esm/cldrDash.mjs

@@ -85,7 +85,7 @@ class DashData {
         const xpstrid = this.pageCombinedEntry[cat][page]; // not necessarily e.xpstrid
         if (!xpstrid) {
           console.error(
-            "Existing xpstrid not found in addAbstainedEntry for cat = " +
+            "Existing xpstrid not found in addCombinedEntry for cat = " +
               cat +
               ", page = " +
               page
@@ -95,7 +95,7 @@ class DashData {
         const dashEntry = this.pathIndex[xpstrid];
         if (!dashEntry) {
           console.error(
-            "Existing entry not found in addAbstainedEntry for cat = " +
+            "Existing entry not found in addCombinedEntry for cat = " +
               cat +
               ", page = " +
               page