feat: add bulk client notifications and email enhancements with review fixes (Stories 3.4 & 3.5)

Story 3-4: Bulk client notification scheduling — BulkNotificationController,
BulkActionBar component, checkbox selection on declarations index.

Story 3-5: Email notification enhancement — observer-driven email on
en_attente_client, cache invalidation on ferme, workspace branding on
all email templates, 11 feature tests.

Code review fixes:
- Move bulk-notify route above resource wildcard to prevent shadowing
- Add static $suppressEmail flag to prevent observer double-sending
  when DeclarationMessageController already sends the email
- Fix canBulkNotify logic (was granting workers access)
- Add WorkspaceUserRole check to BulkNotifyRequest::authorize()
- Replace firstOrCreate with explicit invitation lookup that syncs
  client email and handles used/expired invitations correctly
- Watch declarations.data instead of current_page to clear selection
  on filter/sort changes

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

resources/js/components/declarations/BulkActionBar.vue

@@ -0,0 +1,118 @@
+<script setup lang="ts">
+import { ref } from 'vue';
+import { router } from '@inertiajs/vue3';
+import { Loader2, Mail, X } from 'lucide-vue-next';
+import { Button } from '@/components/ui/button';
+import {
+    Dialog,
+    DialogContent,
+    DialogDescription,
+    DialogFooter,
+    DialogHeader,
+    DialogTitle,
+} from '@/components/ui/dialog';
+
+type Props = {
+    selectedIds: number[];
+    bulkNotifyUrl: string;
+};
+
+type Emits = {
+    clear: [];
+};
+
+const props = defineProps<Props>();
+const emit = defineEmits<Emits>();
+
+const showConfirmDialog = ref(false);
+const processing = ref(false);
+
+function sendNotifications() {
+    processing.value = true;
+    router.post(
+        props.bulkNotifyUrl,
+        { declaration_ids: props.selectedIds },
+        {
+            onSuccess: () => {
+                showConfirmDialog.value = false;
+                processing.value = false;
+                emit('clear');
+            },
+            onError: () => {
+                processing.value = false;
+            },
+        },
+    );
+}
+</script>
+
+<template>
+    <Transition
+        enter-active-class="transition duration-200 ease-out"
+        enter-from-class="translate-y-full opacity-0"
+        enter-to-class="translate-y-0 opacity-100"
+        leave-active-class="transition duration-150 ease-in"
+        leave-from-class="translate-y-0 opacity-100"
+        leave-to-class="translate-y-full opacity-0"
+    >
+        <div
+            v-if="selectedIds.length > 0"
+            class="fixed inset-x-0 bottom-0 z-50 border-t bg-background p-4 shadow-lg md:p-3"
+        >
+            <div
+                class="mx-auto flex max-w-7xl flex-col items-center gap-3 md:flex-row md:justify-between"
+            >
+                <div class="flex items-center gap-3">
+                    <span class="text-sm font-medium">
+                        {{ selectedIds.length }} selectionne{{
+                            selectedIds.length > 1 ? 's' : ''
+                        }}
+                    </span>
+                    <Button
+                        variant="ghost"
+                        size="sm"
+                        @click="emit('clear')"
+                    >
+                        <X class="mr-1 h-4 w-4" />
+                        Effacer
+                    </Button>
+                </div>
+                <Button @click="showConfirmDialog = true">
+                    <Mail class="mr-2 h-4 w-4" />
+                    Notifier les clients
+                </Button>
+            </div>
+        </div>
+    </Transition>
+
+    <Dialog v-model:open="showConfirmDialog">
+        <DialogContent>
+            <DialogHeader>
+                <DialogTitle>Confirmer l'envoi</DialogTitle>
+                <DialogDescription>
+                    Vous allez envoyer une notification par email a
+                    {{ selectedIds.length }} client{{
+                        selectedIds.length > 1 ? 's' : ''
+                    }}
+                    pour demander les documents manquants.
+                </DialogDescription>
+            </DialogHeader>
+            <DialogFooter>
+                <Button
+                    variant="outline"
+                    :disabled="processing"
+                    @click="showConfirmDialog = false"
+                >
+                    Annuler
+                </Button>
+                <Button :disabled="processing" @click="sendNotifications">
+                    <Loader2
+                        v-if="processing"
+                        class="mr-2 h-4 w-4 animate-spin"
+                    />
+                    Envoyer les notifications
+                </Button>
+            </DialogFooter>
+        </DialogContent>
+    </Dialog>
+</template>