fix(nav): improve navigation for authorization routes

app/(auth)/login/page.tsx

@@ -29,7 +29,7 @@ const LoginPage = () => {
       setIsLoading(true);
       setError(null);
       await login(form, setToken);
-      router.push("/home");
+      router.replace("/home");
     } catch (err: unknown) {
       console.error(err);
 

app/(auth)/register/page.tsx

@@ -88,7 +88,7 @@ export default function RegisterPage() {
 
     try {
       await register(form, setToken);
-      router.push("/login");
+      router.replace("/login");
     } catch (err: unknown) {
       setError(formatError(err));
       console.error("User creation error: ", err);

app/(tabs)/categories/mocks/page.tsx

@@ -73,7 +73,10 @@ export default function MockScreen() {
         <Header displayTabTitle="Mocks" />
         <div className="overflow-y-auto">
           <div className="mt-5 px-5">
-            <DestructibleAlert text={errorMsg} />
+            <h1 className="text-2xl font-semibold my-5">
+              {user?.preparation_unit}
+            </h1>
+            <DestructibleAlert text={errorMsg} variant="error" />
           </div>
           <div className="flex justify-center mt-4">
             <button

app/(tabs)/categories/subjects/page.tsx

@@ -68,7 +68,10 @@ export default function PaperScreen() {
         <Header displayTabTitle="Subjects" />
         <div className="overflow-y-auto">
           <div className="mt-5 px-5">
-            <DestructibleAlert text={errorMsg} />
+            <h1 className="text-2xl font-semibold my-5">
+              {user?.preparation_unit}
+            </h1>
+            <DestructibleAlert text={errorMsg} variant="error" />
           </div>
           <div className="flex justify-center mt-4">
             <button

app/(tabs)/categories/topics/page.tsx

@@ -72,7 +72,10 @@ export default function TopicScreen() {
         <Header displayTabTitle="Subjects" />
         <div className="overflow-y-auto">
           <div className="mt-5 px-5">
-            <DestructibleAlert text={errorMsg} />
+            <h1 className="text-2xl font-semibold my-5">
+              {user?.preparation_unit}
+            </h1>
+            <DestructibleAlert text={errorMsg} variant="error" />
           </div>
           <div className="flex justify-center mt-4">
             <button