fix(frontend): repair merge-damaged syntax left by the pm/RBAC revert cycle

Stray braces in App.tsx / ChangeInventoryPage.tsx, an orphaned admin gate in ArrivalsPage.tsx, and a literal revert commit subject pasted into LoginPage.tsx — all made the committed tree unbuildable.

frontend/src/App.tsx

@@ -101,7 +101,6 @@ function RequireAuth({ children }: { children: React.ReactNode }) {
       return <Navigate to="/panel/pm" replace />;
     }
   }
-  }
   return <>{children}</>;
 }
 

frontend/src/pages/Auth/LoginPage.tsx

@@ -95,7 +95,7 @@ export function LoginPage() {
         // سرپرست پروژه → پنل مدیریت پروژه (PM)؛ مدیر پروژه → پنل انبار؛ بقیه → دفتر
         if (user.role === "supervisor") navigate("/panel/pm");
         else navigate(user.role === "pm" ? "/inventory" : "/");
-      } (revert: restore production to the state before 730d0bd (PM/RBAC work moved to 'pm'))
+      }
     } catch (err) {
       toast.error(err instanceof Error ? err.message : "خطا در ورود");
     } finally {

frontend/src/pages/Inventory/ArrivalsPage.tsx

@@ -268,8 +268,6 @@ export function ArrivalsPage() {
     }
   };
 
-  if (!isAdmin && !isPM) {
-
   if (!canAccess) {
 
     return (

frontend/src/pages/Inventory/ChangeInventoryPage.tsx

@@ -573,7 +573,6 @@ export function ChangeInventoryPage() {
     if (type === "PROJECT_TRANSFER") {
       return !!(whId && toProjectId && matTxt.trim() && unitTxt.trim() && parseNum(qty) > 0);
     }
-    }
     if (type === "TRANSFER") return !!(fromId && toId && matTxt.trim() && rows.some((r) => parseNum(r.qty) > 0));
     if (type === "RETURN") return !!(whId && matTxt.trim() && rows.some((r) => parseNum(r.qty) > 0));
     if (type === "FOUND") {