fix : drawer commentaire de semaine — toasts, titre et UI Malio

- Ajoute les clés i18n manquantes (success/errors weekComment.save/delete) qui faisaient afficher la clé brute dans le toast.
- Titre du drawer simplifié à "Commentaire" ; semaine (S{n}) et plage de dates affichées sous le nom de l'employé.
- Drawer, textarea et boutons migrés vers les composants Malio UI ; bouton Annuler supprimé.

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

frontend/components/hours/WeekCommentDrawer.vue

@@ -1,27 +1,39 @@
 <template>
-  <AppDrawer v-model="drawerOpen" :title="`Commentaire — ${formatWeekRange}`">
+  <MalioDrawer v-model="drawerOpen" title="Commentaire">
     <form class="space-y-4" @submit.prevent="onSave">
       <div v-if="employeeLabel" class="text-md font-semibold text-neutral-700">{{ employeeLabel }}</div>
-      <div>
-        <label class="text-md font-semibold text-neutral-700" for="week-comment-content">Commentaire</label>
-        <textarea id="week-comment-content" v-model="content" rows="8" maxlength="5000" class="mt-2 w-full rounded-md border border-neutral-300 bg-white px-3 py-2 text-base text-neutral-900 focus:border-primary-500 focus:outline-none focus:ring-2 focus:ring-secondary-500/20" placeholder="Ex. Arrêt maladie lundi, reprise jeudi..." />
-        <p class="mt-1 text-xs text-neutral-400">{{ content.length }} / 5000</p>
-      </div>
+      <div class="text-md font-semibold text-neutral-700">{{ formatWeekRange }}</div>
+      <MalioInputTextArea
+        v-model="content"
+        label="Commentaire"
+        :size="8"
+        :max-length="5000"
+        :show-counter="true"
+        resize="vertical"
+      />
       <div class="sticky bottom-0 -mx-[20px] bg-white px-[20px] py-3 flex justify-between gap-3">
-        <button v-if="commentId" type="button" class="rounded-lg bg-red-500 px-4 py-2 text-md font-semibold text-white hover:bg-red-600 disabled:opacity-50" :disabled="isSubmitting" @click="onDelete">Supprimer</button>
-        <div class="flex gap-3 ml-auto">
-          <button type="button" class="rounded-lg border border-neutral-200 px-4 py-2 text-md font-semibold text-neutral-700 hover:bg-neutral-100" @click="drawerOpen = false">Annuler</button>
-          <button type="submit" class="rounded-lg bg-primary-500 px-4 py-2 text-md font-semibold text-white hover:bg-secondary-500 disabled:opacity-50" :disabled="isSubmitting || !canSubmit">Enregistrer</button>
-        </div>
+        <MalioButton
+          v-if="commentId"
+          label="Supprimer"
+          variant="danger"
+          :disabled="isSubmitting"
+          @click="onDelete"
+        />
+        <MalioButton
+          label="Enregistrer"
+          button-class="ml-auto"
+          :disabled="isSubmitting || !canSubmit"
+          @click="onSave"
+        />
       </div>
     </form>
-  </AppDrawer>
+  </MalioDrawer>
 </template>
 
 <script setup lang="ts">
 import { computed, ref, watch } from 'vue'
-import AppDrawer from '~/components/AppDrawer.vue'
 import { createWeekComment, deleteWeekComment, updateWeekComment } from '~/services/employee-week-comments'
+import { getIsoWeekNumber, parseYmd } from '~/utils/date'
 
 const props = defineProps<{
   modelValue: boolean
@@ -42,7 +54,9 @@ watch(() => [props.modelValue, props.initialContent] as const, ([open, init]) =>
 
 const formatWeekRange = computed(() => {
   const fmt = (ymd: string) => { const p = ymd.split('-'); return p.length === 3 ? `${p[2]}/${p[1]}/${p[0]}` : ymd }
-  return `${fmt(props.weekStart)} → ${fmt(props.weekEnd)}`
+  const start = parseYmd(props.weekStart)
+  const weekLabel = start ? `S${getIsoWeekNumber(start)}` : ''
+  return weekLabel ? `${weekLabel} du ${fmt(props.weekStart)} au ${fmt(props.weekEnd)}` : `${fmt(props.weekStart)} → ${fmt(props.weekEnd)}`
 })
 
 const canSubmit = computed(() => content.value.trim().length > 0 || props.commentId !== null)