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/composables/useMachineDetailUpdates.ts

@@ -13,6 +13,7 @@ export interface UseMachineDetailUpdatesDeps {
   machine: Ref<AnyRecord | null>
   machineName: Ref<string>
   machineReference: Ref<string>
+  machineSiteId: Ref<string>
   machineConstructeurIds: Ref<string[]>
   machineDocumentsLoaded: Ref<boolean>
   machineComponentLinks: Ref<AnyRecord[]>
@@ -40,6 +41,7 @@ export function useMachineDetailUpdates(deps: UseMachineDetailUpdatesDeps) {
     machine,
     machineName,
     machineReference,
+    machineSiteId,
     machineConstructeurIds,
     machineComponentLinks,
     machinePieceLinks,
@@ -63,6 +65,7 @@ export function useMachineDetailUpdates(deps: UseMachineDetailUpdatesDeps) {
       const result: any = await updateMachineApi(machine.value.id as string, {
         name: machineName.value,
         reference: machineReference.value,
+        siteId: machineSiteId.value || undefined,
         constructeurIds: cIds,
       } as any)
       if (result.success) {