feat(heures) : affichage des jours travaillés (CUSTOM) sur la vue Jour

Le libellé sous le nom de l'employé affiche en suffixe les jours du planning
workDaysHours au format court (ex. BUREAU — CDI — LU,JE) pour les contrats CUSTOM.
Résolu à la date filtrée et exposé via WorkHourDayContext.workDaysHours ; formaté
front par formatWorkedDaysShort. Limité aux CUSTOM (35h/39h/forfait/intérim sans
planning → rien affiché) et à l'écran Heures (pas Heures Conducteurs).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

frontend/components/hours/HoursDayView.vue

@@ -14,7 +14,7 @@
                         <span class="font-normal text-neutral-600 text-sm">({{ contractLabel(employee) }})</span>
                     </p>
                     <p class="text-sm text-neutral-500 truncate">
-                        {{ employee.site?.name ?? 'Sans site' }}<span v-if="getRowContractNature(employee.id)"> — {{ contractNatureLabel(getRowContractNature(employee.id) ?? undefined) }}</span>
+                        {{ employee.site?.name ?? 'Sans site' }}<span v-if="getRowContractNature(employee.id)"> — {{ contractNatureLabel(getRowContractNature(employee.id) ?? undefined) }}</span><span v-if="getRowWorkedDaysLabel(employee.id)"> — {{ getRowWorkedDaysLabel(employee.id) }}</span>
                     </p>
                 </div>
 
@@ -212,7 +212,7 @@
                     </p>
                     <p class="text-neutral-500 truncate inline-flex items-center gap-2">
                         <span>
-                            {{ employee.site?.name ?? 'Sans site' }}<span v-if="getRowContractNature(employee.id)"> — {{ contractNatureLabel(getRowContractNature(employee.id) ?? undefined) }}</span>
+                            {{ employee.site?.name ?? 'Sans site' }}<span v-if="getRowContractNature(employee.id)"> — {{ contractNatureLabel(getRowContractNature(employee.id) ?? undefined) }}</span><span v-if="getRowWorkedDaysLabel(employee.id)"> — {{ getRowWorkedDaysLabel(employee.id) }}</span>
                         </span>
                         <span
                             v-if="isAdmin && (rows[employee.id]?.isSiteValid ?? false)"
@@ -406,6 +406,7 @@ const props = defineProps<{
     hasRowFormation: (employeeId: number) => boolean
     getRowFormationLabel: (employeeId: number) => string
     getRowContractNature: (employeeId: number) => 'CDI' | 'CDD' | 'INTERIM' | null
+    getRowWorkedDaysLabel: (employeeId: number) => string | null
     getRowUpdatedAt: (employeeId: number) => string
     getPresenceDayValue: (employeeId: number) => string
     onAbsenceClick: (employeeId: number) => void