fix: integration fixes from final review

- useSettings: upsert instead of update (safe if migration rows missing)
- invite-admin-user: return created_at and last_sign_in_at in response
- UserManagementPage: clear deleteError when opening new confirmation

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

src/admin/settings/useSettings.js

@@ -32,8 +32,7 @@ export function useSettings() {
   const updatePrice = async (key, value) => {
     const { error } = await supabase
       .from('settings')
-      .update({ value: String(value), updated_at: new Date().toISOString() })
-      .eq('key', key);
+      .upsert({ key, value: String(value), updated_at: new Date().toISOString() }, { onConflict: 'key' });
 
     if (!error) {
       const thickness = parseInt(key.replace('price_', ''), 10);

src/admin/users/UserManagementPage.jsx

@@ -244,7 +244,7 @@ const UserManagementPage = () => {
                         </span>
                       ) : (
                         <button
-                          onClick={() => setConfirmDeleteId(user.id)}
+                          onClick={() => { setConfirmDeleteId(user.id); setDeleteError(''); }}
                           title="Удалить пользователя"
                           style={{
                             background: 'transparent',

supabase/functions/invite-admin-user/index.ts

@@ -60,7 +60,12 @@ Deno.serve(async (req) => {
   }
 
   return new Response(
-    JSON.stringify({ id: data.user.id, email: data.user.email }),
+    JSON.stringify({
+      id: data.user.id,
+      email: data.user.email,
+      created_at: data.user.created_at,
+      last_sign_in_at: data.user.last_sign_in_at ?? null,
+    }),
     { headers: { ...corsHeaders, 'Content-Type': 'application/json' } },
   );
 });