Fix: HF-85 propagate CellError from criteria header cells

Per Cursor Bugbot review and Excel behavior — when a criteria header
cell evaluates to a CellError (e.g., #REF!, #DIV/0!), the D-function
should return that error rather than silently mapping the column to
-1 and continuing. This aligns the header-cell behavior with the data
cell behavior at the same location (lines 535-537), which already
propagated CellError.

Author: marcin-kordas-hoc

src/interpreter/plugin/DatabasePlugin.ts

@@ -502,6 +502,14 @@ export class DatabasePlugin extends FunctionPlugin implements FunctionPluginType
     const criteriaData = criteria.data
     const criteriaHeaders = criteriaData[0]
 
+    // Propagate errors from criteria header cells (Excel returns the header
+    // error when the D-function is evaluated, instead of silently skipping).
+    for (const criteriaHeader of criteriaHeaders) {
+      if (criteriaHeader instanceof CellError) {
+        return criteriaHeader
+      }
+    }
+
     // Map each criteria column to a database column index (or -1 if no match)
     const criteriaColumnMapping: number[] = criteriaHeaders.map(criteriaHeader => {
       if (typeof criteriaHeader !== 'string') {