fix(installments): allow cheque total to exceed installment amount

Generator now allows amt*count >= remaining (not forced equal).
All cheques get the same amount; no last-cheque manipulation.
Preview and guard alert only block when total < remaining.
Server-side storeBatch already accepted grandTotal >= planTotal.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/Modules/Installments/Views/cheques.php

@@ -305,11 +305,9 @@ $coveragePct  = $planTotal > 0 ? min(100, round($uploadedTotal / $planTotal * 10
         var needed     = REMAINING_COUNT;
         var remaining  = Math.round((PLAN_TOTAL - ALREADY_UPLOADED) * 100) / 100;
         var endNum     = NEXT_NUM_FOR_PLAN + needed - 1;
-        var lastAmt   = Math.round((remaining - amt * (needed - 1)) * 100) / 100;
-        // total of new cheques = amt*(needed-1) + lastAmt = exactly remaining amount
-        var newTotal  = Math.round((amt * (needed - 1) + lastAmt) * 100) / 100;
-        // grand total = existing + new = must equal PLAN_TOTAL
+        var newTotal   = Math.round(amt * needed * 100) / 100;
         var grandTotal = Math.round((ALREADY_UPLOADED + newTotal) * 100) / 100;
+        var covered    = newTotal >= remaining - 0.009;
 
         document.getElementById('genCount').textContent        = needed;
         document.getElementById('genAmtDisplay').textContent   = fmt(amt);
@@ -320,13 +318,8 @@ $coveragePct  = $planTotal > 0 ? min(100, round($uploadedTotal / $planTotal * 10
                 ? 'تكملة من #' + NEXT_NUM_FOR_PLAN + ' ← #' + endNum + ' (الموجود: ' + ALREADY_COUNT + ' شيك بقيمة ' + fmt(ALREADY_UPLOADED) + ')'
                 : '#' + NEXT_NUM_FOR_PLAN + ' ← #' + endNum;
 
-        if (lastAmt <= 0) {
-            box.style.background = '#FEF2F2';
-            box.style.border = '1px solid #FECACA';
-        } else {
-            box.style.background = '';
-            box.style.border = '';
-        }
+        box.style.background = covered ? '' : '#FEF2F2';
+        box.style.border     = covered ? '' : '1px solid #FECACA';
         box.style.display = '';
     };
 
@@ -343,28 +336,27 @@ $coveragePct  = $planTotal > 0 ? min(100, round($uploadedTotal / $planTotal * 10
 
         var needed    = REMAINING_COUNT;
         var remaining = Math.round((PLAN_TOTAL - ALREADY_UPLOADED) * 100) / 100;
+        var newTotal  = Math.round(amt * needed * 100) / 100;
 
-        // Guard: per-cheque amount * (needed-1) must leave a positive last cheque
-        var lastAmt = Math.round((remaining - amt * (needed - 1)) * 100) / 100;
-        if (lastAmt <= 0) {
-            var maxAmt = Math.round((remaining / needed) * 100) / 100;
+        // Guard: total of new cheques must cover the remaining amount (can exceed, never less)
+        if (newTotal < remaining - 0.009) {
+            var minAmt = Math.ceil((remaining / needed) * 100) / 100;
             alert(
-                'قيمة الشيك كبيرة جداً — الشيك الأخير سيكون صفراً أو سالباً.\n' +
-                'الحد الأقصى المسموح: ' + maxAmt.toFixed(2) + ' ج.م لكل شيك\n' +
-                '(المبلغ المتبقي ' + remaining.toFixed(2) + ' ج.م ÷ ' + needed + ' شيكات)'
+                'إجمالي الشيكات الجديدة (' + newTotal.toFixed(2) + ' ج.م) أقل من المبلغ المتبقي (' + remaining.toFixed(2) + ' ج.م)\n' +
+                'الحد الأدنى للشيك: ' + minAmt.toFixed(2) + ' ج.م\n' +
+                'يمكن أن يزيد الإجمالي عن المبلغ المتبقي ولكن لا يقل عنه'
             );
             return;
         }
 
+        // All cheques have the same amount — total may exceed planTotal, that is acceptable
         rows = [];
         for (var i = 0; i < needed; i++) {
-            var isLast = (i === needed - 1);
             rows.push({
                 cheque_number: String(NEXT_NUM_FOR_PLAN + i),
                 bank_name:     bank,
                 cheque_date:   addMonths(startDate, i),
-                // Last cheque absorbs rounding difference to guarantee total = PLAN_TOTAL
-                cheque_amount: isLast ? lastAmt : amt,
+                cheque_amount: amt,
                 notes: '',
             });
         }