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.

scratch/dump_headers.js

@@ -0,0 +1,13 @@
+import * as XLSX from 'xlsx';
+import * as fs from 'fs';
+
+const buf = fs.readFileSync('data (3).xlsx');
+const wb = XLSX.read(buf, {type: 'buffer'});
+const ws = wb.Sheets[wb.SheetNames[0]];
+const data = XLSX.utils.sheet_to_json(ws, {header: 1});
+const headers = data[0];
+
+console.log('Headers:');
+headers.forEach((h, i) => {
+    console.log(`${i}: ${h}`);
+});