feat(mail) : MailFolderTree — arbre récursif dossiers, badges unread, icônes système

frontend/components/mail/MailFolderTree.vue

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+<script setup lang="ts">
+import type { MailFolderDto } from '~/services/dto/mail'
+
+const props = defineProps<{
+    /** Arbre de dossiers (getter folderTree du store) */
+    folders: readonly MailFolderDto[]
+    /** Chemin du dossier actuellement sélectionné */
+    selectedPath: string | null
+    /** Niveau de profondeur pour l'indentation (usage récursif interne) */
+    depth?: number
+}>()
+
+const emit = defineEmits<{
+    select: [path: string]
+}>()
+
+const { getFolderLabel, getFolderIcon } = useSystemFolderLabel()
+const { t } = useI18n()
+
+const currentDepth = computed(() => props.depth ?? 0)
+
+function handleSelect(path: string): void {
+    emit('select', path)
+}
+
+function paddingStyle(): Record<string, string> {
+    const depth = currentDepth.value
+    if (depth <= 0) return {}
+    return { paddingLeft: `${0.75 + depth * 0.75}rem` }
+}
+</script>
+
+<template>
+    <div>
+        <div
+            v-if="folders.length === 0 && currentDepth === 0"
+            class="px-3 py-4 text-sm text-neutral-400 italic"
+        >
+            {{ t('mail.empty.folder') }}
+        </div>
+
+        <template v-else>
+            <div v-for="folder in folders" :key="folder.path">
+                <button
+                    type="button"
+                    class="w-full text-left"
+                    @click="handleSelect(folder.path)"
+                >
+                    <div
+                        class="flex items-center gap-2 rounded-md px-3 py-1.5 text-sm transition-colors"
+                        :class="
+                            selectedPath === folder.path
+                                ? 'bg-primary-100 text-primary-700 font-medium'
+                                : 'text-neutral-700 hover:bg-neutral-100'
+                        "
+                        :style="paddingStyle()"
+                    >
+                        <Icon
+                            :name="getFolderIcon(folder.path)"
+                            size="16"
+                            class="flex-shrink-0"
+                            :class="selectedPath === folder.path ? 'text-primary-600' : 'text-neutral-400'"
+                        />
+
+                        <span class="flex-1 truncate">
+                            {{ getFolderLabel(folder.path, folder.displayName) }}
+                        </span>
+
+                        <span
+                            v-if="folder.unreadCount > 0"
+                            class="ml-auto flex-shrink-0 rounded-full bg-primary-500 px-1.5 py-0.5 text-xs font-bold text-white"
+                        >
+                            {{ folder.unreadCount > 99 ? '99+' : folder.unreadCount }}
+                        </span>
+                    </div>
+                </button>
+
+                <MailFolderTree
+                    v-if="folder.children && folder.children.length > 0"
+                    :folders="folder.children"
+                    :selected-path="selectedPath"
+                    :depth="currentDepth + 1"
+                    @select="handleSelect"
+                />
+            </div>
+        </template>
+    </div>
+</template>