Revert "added txt file export as extra export."

This reverts commit 99f80a25d0.

backend/managerRoutes.js

@@ -392,7 +392,6 @@ export default function () {
       }
 
       const wantXlsx = String(req.query.format || 'csv').toLowerCase() === 'xlsx'
-      const wantTxt = String(req.query.format || '').toLowerCase() === 'txt'
 
       let workerIdClause = ''
       let departmentClause = ''
@@ -523,39 +522,6 @@ export default function () {
         byWorkerForXlsx.set(`${w.username}||${w.full_name}||${w.department}`, perWorkerRows)
       }
 
-      // ===== TXT branch =====
-      if (wantTxt) {
-        const lines = []
-        for (const wId in workByDay) {
-          const w = workByDay[wId]
-          const seen = new Set()
-          for (const day of Object.keys(w.days).sort()) {
-            const events = w.days[day].slice().sort((a, b) => a.time - b.time)
-            for (const e of events) {
-              const code = e.type === 'clock_in' ? '1' : '0'
-              const date = ymdInTZ(e.time, TZ)
-              const timeStr = new Intl.DateTimeFormat('en-GB', {
-                timeZone: TZ,
-                hour: '2-digit',
-                minute: '2-digit',
-                second: '2-digit',
-                hour12: false,
-              }).format(e.time)
-              const line = `${w.username},"${code}","${date} ${timeStr}";"${w.full_name}"`
-              if (!seen.has(line)) {
-                seen.add(line)
-                lines.push(line)
-              }
-            }
-          }
-        }
-        res.set('X-Export-TZ', TZ)
-        res.header('Content-Type', 'text/plain')
-          .attachment(`attendance_${startDate}_to_${endDate}.txt`)
-          .send(lines.join('\n'))
-        return
-      }
-
       // ===== XLSX branch: grouped header + per-day summary sheet =====
       if (wantXlsx) {
         const wb = new ExcelJS.Workbook()