fix: wrap login redirect routes with encodeURIComponent (#11778)

### What

This PR updates the `login` flow by wrapping redirect routes with
`encodeURIComponent`. This ensures that special characters in URLs (such
as ?, &, #) are properly encoded, preventing potential issues with
navigation and redirection.

packages/next/src/views/Login/LoginForm/index.tsx

@@ -91,7 +91,13 @@ export const LoginForm: React.FC<{
       initialState={initialState}
       method="POST"
       onSuccess={handleLogin}
-      redirect={typeof searchParams?.redirect === 'string' ? searchParams.redirect : adminRoute}
+      redirect={
+        typeof searchParams?.redirect === 'string'
+          ? searchParams.redirect.startsWith('/')
+            ? searchParams.redirect
+            : encodeURIComponent(searchParams.redirect)
+          : adminRoute
+      }
       waitForAutocomplete
     >
       <div className={`${baseClass}__inputWrap`}>

packages/next/src/views/Login/index.tsx

@@ -25,8 +25,15 @@ export function LoginView({ initPageResult, params, searchParams }: AdminViewSer
     routes: { admin },
   } = config
 
+  const redirectUrl =
+    typeof searchParams.redirect === 'string'
+      ? searchParams.redirect.startsWith('/') // If it's a relative path, keep it
+        ? searchParams.redirect
+        : encodeURIComponent(searchParams.redirect) // Otherwise, encode it
+      : admin
+
   if (user) {
-    redirect((searchParams.redirect as string) || admin)
+    redirect(redirectUrl)
   }
 
   const collectionConfig = payload?.collections?.[userSlug]?.config

packages/ui/src/views/Edit/index.tsx

@@ -323,6 +323,7 @@ export function DefaultEditView({
       schemaPathSegments,
       isLockingEnabled,
       setDocumentIsLocked,
+      startRouteTransition,
     ],
   )