Add the v3.5.2 release notes

pages/release-notes.mdx

@@ -9,7 +9,6 @@ import { useMemo } from 'react';
 import LabReleasesClient from "/components/release-notes/LabReleasesClient";
 import {SocialCard} from '/components/social-card/SocialCard';
 
-
 # Release notes
 
 Check out the latest updates and enhancements to Memgraph's products. Discover
@@ -29,7 +28,6 @@ informed and prepared.
 />
 </Cards>
 
-
 ## 🚨 Important updates
 
 New releases might affect your existing code, queries or configuration.
@@ -42,9 +40,39 @@ recompilation could lead to unexpected crashes — better to be safe than
 troubleshoot in production.
 </Callout>
 
-
 ## 🚀 Latest release
 
+### Memgraph v3.5.2 - September 24th, 2025
+
+{<h4 className="custom-header">✨ New features</h4>}
+
+- Added support for pattern expressions inside the where clause. Users are now
+  able to do a query similar to `MATCH (a) WHERE NOT (a)-[]->(:Something)`.
+  Syntax behaves identical to EXISTS patterns.
+  [#3286](https://github.com/memgraph/memgraph/pull/3286)
+
+{<h4 className="custom-header">🛠️ Improvements</h4>}
+
+- Improved performance of `convert_c.to_tree`. to_tree should run some 3-4
+  times faster than before.
+  [#3203](https://github.com/memgraph/memgraph/pull/3203)
+
+{<h4 className="custom-header">🐞 Bug fixes</h4>}
+
+- Fixed `convert_c.to_tree`. It now merges nodes with multiple labels which
+  were duplicated in the input paths. The generated tree structure is now
+  correct, regardless of the number of node labels.
+  [#3283](https://github.com/memgraph/memgraph/pull/3283)
+
+### MAGE v3.5.2 - September 24th, 2025
+
+{<h4 className="custom-header">🐞 Bug fixes</h4>}
+
+- Fixed `map.merge` module to accept nullable arguments.
+  [#671](https://github.com/memgraph/mage/pull/671)
+
+## Previous releases
+
 ### Memgraph v3.5.1 - September 11th, 2025
 
 {<h4 className="custom-header">🐞 Bug fixes</h4>}
@@ -58,8 +86,6 @@ troubleshoot in production.
   to worry about conflicts between their dataset's labels and Cypher keywords.
   [#3256](https://github.com/memgraph/memgraph/pull/3256)
 
-## Previous releases
-
 ### Memgraph v3.5.0 - August 27th, 2025
 
 {<h4 className="custom-header">⚠️ Breaking changes</h4>}