feat(machine) : allow site editing on machine detail page and align card buttons

- Add site select field in MachineInfoCard (edit mode)
- Include siteId in machine PATCH payload
- Align action buttons (Modifier/Supprimer/Détails) consistently at card bottom
- Use mt-auto + flex-col to push buttons to bottom across all machine cards

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/pages/machines/index.vue

@@ -68,7 +68,7 @@
           class="card bg-base-100 shadow-sm hover:shadow-xl transition-shadow cursor-pointer"
           @click="viewMachineDetails(machine)"
         >
-          <div class="card-body">
+          <div class="card-body flex flex-col">
             <div class="flex items-center justify-between mb-2">
               <h3 class="card-title text-lg">
                 {{ machine.name }}
@@ -87,15 +87,15 @@
               </div>
             </div>
 
-            <div class="card-actions justify-end mt-4">
-              <button class="btn btn-sm btn-outline" @click.stop="editMachine(machine)">
+            <div class="mt-auto pt-3 flex items-center justify-end gap-2">
+              <button v-if="canEdit" class="btn btn-ghost btn-xs" @click.stop="editMachine(machine)">
                 Modifier
               </button>
-              <button v-if="canEdit" class="btn btn-sm btn-error" @click.stop="confirmDeleteMachine(machine)">
+              <button v-if="canEdit" class="btn btn-ghost btn-xs text-error" @click.stop="confirmDeleteMachine(machine)">
                 Supprimer
               </button>
-              <NuxtLink :to="`/machine/${machine.id}`" class="btn btn-sm btn-primary">
-                Voir détails
+              <NuxtLink :to="`/machine/${machine.id}`" class="btn btn-primary btn-xs">
+                Détails
               </NuxtLink>
             </div>
           </div>