Add November 21 changelog entry (#1827)

* Update changelog.mdx

* copyedit

---------

Co-authored-by: mintlify[bot] <109931778+mintlify[bot]@users.noreply.github.com>
Co-authored-by: Ethan Palm <[email protected]>

Author: mintlify[bot]

changelog.mdx

@@ -5,6 +5,27 @@ rss: true
 noindex: true
 ---
 
+<Update label="November 21" tags={["Improvements"]} rss={{ title: "Weekly Updates", description: "API playground enhancements, localization updates, and CLI improvements" }}>
+  ## API playground improvements
+
+  - Fixed issue where response section would disappear when switching between endpoints with different response codes. The playground now properly resets to the first available response code when navigating to a new endpoint.
+  - Fixed double "Authorization" header display in HTTP Basic authentication schemes. The authentication section now shows a cleaner interface with proper field labels and descriptions.
+  - Improved handling of `oneOf` schemas in nested objects and arrays. Complex API schemas with multiple type options now render correctly as dropdowns instead of tabs in appropriate contexts.
+  - Fixed missing path parameters that were defined at the endpoint level in OpenAPI specs. Parameters specified above individual operations are now properly included in both the main page and playground.
+  - Enhanced response example generation to include all required properties, even when examples only specify some fields. This ensures response examples are complete and accurate.
+  - Fixed missing prefill examples in object arrays. Array items with example data now properly populate in the playground with correct indexing.
+  - Improved description padding and spacing throughout the API playground for better readability and visual consistency.
+
+  ## Localization improvements
+
+  - Enhanced translations in contextual menu options and assistant status messages for all supported languages.
+
+  ## CLI improvements
+
+  - Added error message for users running `mint dev` on Node.js versions below 20.17. Users are guided to upgrade to an LTS version.
+
+</Update>
+
 <Update label="November 15" tags={["New releases", "Improvements"]} rss={{ title: "Weekly Updates", description: "Badge component, API playground improvements, custom language support, and performance enhancements" }}>
   ## New features