Address new TypeScript warnings in core files, improve type definitions.

lib/md060.mjs

@@ -41,6 +41,7 @@ export default {
       const headingRow = rows[0];
 
       // Determine errors for style "aligned"
+      /** @type {RuleOnErrorInfo[]} */
       const errorsIfAligned = [];
       if (styleAlignedAllowed) {
         const headingDividerColumns = filterByTypes(headingRow.children, [ "tableCellDivider" ]).map((divider) => divider.startColumn);
@@ -56,7 +57,9 @@ export default {
       }
 
       // Determine errors for styles "compact" and "tight"
+      /** @type {RuleOnErrorInfo[]} */
       const errorsIfCompact = [];
+      /** @type {RuleOnErrorInfo[]} */
       const errorsIfTight = [];
       if (
         (styleCompactAllowed || styleTightAllowed) &&