feat : ajout colonne Cumul sur l'écran RTT (#18)

Affiche le solde RTT à la fin de chaque semaine (report N-1 + somme
totalMinutes des semaines − paiements des mois antérieurs). Permet la
comparaison ligne à ligne avec un suivi RH externe.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

| Numéro du ticket | Titre du ticket |
|------------------|-----------------|
|                  |                 |

## Description de la PR

## Modification du .env

## Check list

- [ ] Pas de régression
- [ ] TU/TI/TF rédigée
- [ ] TU/TI/TF OK
- [ ] CHANGELOG modifié

Reviewed-on: #18
Co-authored-by: tristan <tristan@yuno.malio.fr>
Co-committed-by: tristan <tristan@yuno.malio.fr>

src/Dto/Rtt/EmployeeRttWeekSummary.php

@@ -17,5 +17,6 @@ final class EmployeeRttWeekSummary
         public int $base50Minutes = 0,
         public int $bonus50Minutes = 0,
         public int $totalMinutes = 0,
+        public int $cumulativeBalanceMinutes = 0,
     ) {}
 }

src/State/EmployeeRttSummaryProvider.php

@@ -164,6 +164,18 @@ final readonly class EmployeeRttSummaryProvider implements ProviderInterface
             $monthBuckets[$m]['bonus50'] += $payment->getBonus50Minutes();
         }
 
+        $runningCumul = $summary->carryFromPreviousYearMinutes;
+        $prevMonth    = null;
+        foreach ($summary->weeks as $week) {
+            if (null !== $prevMonth && $week->month !== $prevMonth && isset($monthBuckets[$prevMonth])) {
+                $b = $monthBuckets[$prevMonth];
+                $runningCumul -= $b['base25'] + $b['bonus25'] + $b['base50'] + $b['bonus50'];
+            }
+            $runningCumul += $week->totalMinutes;
+            $week->cumulativeBalanceMinutes = $runningCumul;
+            $prevMonth                      = $week->month;
+        }
+
         $monthPayments    = [];
         $totalPaidMinutes = 0;