fix: resolve permission toggle persistence, nudge terminology, and bulk action bugs (Bugs #2-5)

- Fix togglePermission() to always include all permission keys with false defaults
- Add migration to backfill null/empty Manager permissions with config defaults
- Rename nudge UI text from "Relance" to "Notification"/"Notifier" across 8 files
- Fix select-all checkbox and show checkboxes on all declaration rows
- Remove en_attente_client status restriction from BulkNotificationController

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

resources/js/pages/team/Index.vue

@@ -139,7 +139,12 @@ function openPermissionsDialog(member: TeamMember) {
 
 function togglePermission(key: string, value: boolean) {
     if (!permissionsMember.value?.permissionsUrl) return;
+    // Ensure ALL permission keys are present, defaulting missing keys to false
+    const base = Object.fromEntries(
+        Object.keys(props.availablePermissions).map((k) => [k, false]),
+    );
     const updatedPermissions = {
+        ...base,
         ...permissionsMember.value.permissions,
         [key]: value,
     };