feat(tenancy): add resend invitation for pending team members

New resend_invitation() service method regenerates the token and
resends the invitation email for pending members.

Available on all frontends:
- Merchant: POST /merchants/account/team/stores/{sid}/members/{uid}/resend
- Store: POST /store/team/members/{uid}/resend

UI: paper-airplane icon appears on pending members in both merchant
and store team pages.

i18n: resend_invitation + invitation_resent keys in 4 locales.
Also translated previously untranslated invitation_sent_successfully
in fr/de/lb.

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

app/modules/tenancy/templates/tenancy/merchant/team.html

@@ -151,6 +151,13 @@
                                 </template>
                                 <template x-if="!member.is_owner">
                                     <div class="flex items-center gap-2">
+                                        <button x-show="getMemberStatus(member) === 'pending'"
+                                                @click="resendInvitation(member)"
+                                                :disabled="saving"
+                                                class="p-1.5 text-gray-500 hover:text-green-600 dark:text-gray-400 dark:hover:text-green-400 hover:bg-gray-100 dark:hover:bg-gray-700 rounded-lg transition-colors"
+                                                :title="$t('tenancy.team.resend_invitation')">
+                                            <span x-html="$icon('paper-airplane', 'w-4 h-4')"></span>
+                                        </button>
                                         <button @click="openEditModal(member)"
                                                 class="p-1.5 text-gray-500 hover:text-purple-600 dark:text-gray-400 dark:hover:text-purple-400 hover:bg-gray-100 dark:hover:bg-gray-700 rounded-lg transition-colors"
                                                 :title="$t('tenancy.team.edit_member')">

app/modules/tenancy/templates/tenancy/store/team.html

@@ -115,6 +115,16 @@
                 <!-- Actions -->
                 <td class="px-4 py-3">
                     <div class="flex items-center space-x-2 text-sm">
+                        <!-- Resend invitation - pending only -->
+                        <button
+                            @click="resendInvitation(member)"
+                            :disabled="saving"
+                            class="p-1 text-gray-500 hover:text-green-600 dark:text-gray-400 dark:hover:text-green-400"
+                            title="Resend Invitation"
+                            x-show="member.invitation_pending"
+                        >
+                            <span x-html="$icon('paper-airplane', 'w-5 h-5')"></span>
+                        </button>
                         <!-- Edit button - not for owners -->
                         <button
                             @click="openEditModal(member)"