feat(absences) : avancement module absences + suppression du portail client

Deux lots regroupés sur la branche feat/absence-management.

Suppression complète du portail client :
- retire ROLE_CLIENT (security.yaml) ; User::getRoles() ajoute toujours ROLE_USER
- supprime l'entité ClientTicket (+ repo, states, relations), User.client et
  User.allowedProjects, NotificationService, ProjectAllowedExtension, le bloc
  ROLE_CLIENT de MailAccessChecker
- front : pages /portal, layout portal, composants client-ticket/,
  AdminClientTicketTab, services/dto/i18n/docs associés
- fixtures : retire les users client-liot / client-acme
- migration Version20260522110000 (drop client_ticket, user_allowed_projects,
  colonnes liées ; task_document.task_id -> NOT NULL)
- tests : retire les cas obsolètes testant le blocage des clients sur le mail

Module gestion des absences (WIP) :
- entités / migrations (Version20260521160000, Version20260522090000)
- pages absences.vue / team-absences.vue, composants frontend/components/absence/
- services front, AccrueLeaveCommand, PublicHolidayController

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

frontend/composables/useAbsenceHelpers.ts

@@ -0,0 +1,93 @@
+import type { AbsenceRequest, AbsenceStatus, AbsenceType, HalfDay } from '~/services/dto/absence'
+
+export type BadgeVariant = 'neutral' | 'info' | 'success' | 'warning' | 'danger'
+
+const STATUS_VARIANTS: Record<AbsenceStatus, BadgeVariant> = {
+    pending: 'warning',
+    approved: 'success',
+    rejected: 'danger',
+    cancelled: 'neutral',
+}
+
+const STATUS_ICONS: Record<AbsenceStatus, string> = {
+    pending: 'mdi:clock-outline',
+    approved: 'mdi:check-circle-outline',
+    rejected: 'mdi:close-circle-outline',
+    cancelled: 'mdi:cancel',
+}
+
+// Colours used for the calendar bars, keyed by absence type.
+const TYPE_COLORS: Record<AbsenceType, string> = {
+    cp: '#4A90D9',
+    mariage_pacs: '#E91E63',
+    conge_parental: '#9C27B0',
+    deces: '#607D8B',
+    maladie: '#C62828',
+}
+
+export function useAbsenceHelpers() {
+    const { t } = useI18n()
+
+    function statusLabel(status: AbsenceStatus): string {
+        return t(`absences.status.${status}`)
+    }
+
+    function statusVariant(status: AbsenceStatus): BadgeVariant {
+        return STATUS_VARIANTS[status] ?? 'neutral'
+    }
+
+    function statusIcon(status: AbsenceStatus): string {
+        return STATUS_ICONS[status] ?? 'mdi:help-circle-outline'
+    }
+
+    function typeLabel(type: AbsenceType): string {
+        return t(`absences.types.${type}`)
+    }
+
+    function typeColor(type: AbsenceType): string {
+        return TYPE_COLORS[type] ?? '#9CA3AF'
+    }
+
+    function halfDayLabel(half: HalfDay): string {
+        return t(`absences.halfDay.${half}`)
+    }
+
+    function formatDate(iso: string | null): string {
+        if (!iso) return ''
+        const d = new Date(iso)
+        if (isNaN(d.getTime())) return ''
+        const day = String(d.getDate()).padStart(2, '0')
+        const month = String(d.getMonth() + 1).padStart(2, '0')
+        return `${day}/${month}/${d.getFullYear()}`
+    }
+
+    /** Human-readable period with half-day annotations. */
+    function formatRange(req: Pick<AbsenceRequest, 'startDate' | 'endDate' | 'startHalfDay' | 'endHalfDay'>): string {
+        const start = formatDate(req.startDate)
+        const end = formatDate(req.endDate)
+        const startSuffix = req.startHalfDay ? ` (${halfDayLabel(req.startHalfDay)})` : ''
+        const endSuffix = req.endHalfDay ? ` (${halfDayLabel(req.endHalfDay)})` : ''
+        if (start === end) {
+            return `${start}${startSuffix}`
+        }
+        return `${start}${startSuffix} → ${end}${endSuffix}`
+    }
+
+    function formatDays(days: number): string {
+        const rounded = Math.round(days * 2) / 2
+        const unit = rounded > 1 ? t('absences.daysPlural') : t('absences.daySingular')
+        return `${rounded} ${unit}`
+    }
+
+    return {
+        statusLabel,
+        statusVariant,
+        statusIcon,
+        typeLabel,
+        typeColor,
+        halfDayLabel,
+        formatDate,
+        formatRange,
+        formatDays,
+    }
+}