Fix: Implement dynamic column detection to handle Excel structure changes (insertion of PM Classification). This fixes the Missing data error in Pricing Units and other views.

src/components/HistoryView.tsx

@@ -1,7 +1,8 @@
 import React, { useState, useEffect } from 'react';
 import { History, RotateCcw, ChevronDown, ChevronRight, User, Calendar, Tag, Search, X, Edit2 } from 'lucide-react';
 import { getHistory, deleteHistoryEntry, HistoryEntry } from '../lib/supabase';
-import { ExcelRow, COLUMNS } from '../types';
+import { ExcelRow } from '../types';
+import { useColumns } from '../contexts/ColumnsContext';
 import { cn } from '../lib/utils';
 
 interface HistoryViewProps {
@@ -13,6 +14,7 @@ interface HistoryViewProps {
 }
 
 export function HistoryView({ headers, data, onRevert, onEdit, sessionToken }: HistoryViewProps) {
+  const COLUMNS = useColumns();
   const [history, setHistory] = useState<HistoryEntry[]>([]);
   const [loading, setLoading] = useState(true);
   const [expandedId, setExpandedId] = useState<string | null>(null);