Update changelogs from fern repo (#4425)

Author: fern-support

fern/products/sdks/overview/csharp/changelog/2026-03-20.mdx

@@ -1,3 +1,13 @@
+## 2.46.0
+**`(feat):`** Wire up WebSocket reconnection logic. The `WebSocketConnection` template now
+contains a complete reconnection implementation ported from the Marfusios library:
+heartbeat timer (`ReconnectTimeout`), error-retry timer (`ErrorReconnectTimeout`),
+lost-connection delay (`LostReconnectTimeout`), and `Reconnect()`/`ReconnectOrFail()`
+public methods. The generated WebSocket API classes expose a `Reconnecting` event
+and an `IsReconnectionEnabled` option (default: `false`) so callers can opt in to
+automatic reconnection. All timeout properties are configurable with sensible defaults.
+
+
 ## 2.45.1
 **`(fix):`** Fix sticky compression on reconnect. `DeflateOptions` is now explicitly reset to
 `null` when `EnableCompression` is `false`, preventing a previous non-null value