fix(sdk): adapt to matrix-rust-sdk 26.04.x API shifts

TracingConfiguration gained a required sentryConfig parameter between
26.03.x and 26.04.x. Pass null — we don't use SDK-side Sentry.

Timeline.sendRaw was moved off Timeline onto Room. Add sendRawEvent to
the JoinedRoom API interface, implement in JoinedRustRoom by calling
innerRoom.sendRaw, and have RustTimeline.sendRaw proxy through the
owning JoinedRoom. Our /pay event path keeps working without callers
having to know about the SDK move.

libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/room/JoinedRoom.kt

@@ -212,4 +212,16 @@ interface JoinedRoom : BaseRoom {
      * @return Result indicating success or failure.
      */
     suspend fun sendLiveLocation(geoUri: String): Result<Unit>
+
+    /**
+     * Send a custom/raw event to the room (non-message event types).
+     *
+     * Used by the Cardano wallet for `/pay` events
+     * (e.g., `co.sulkta.payment.request`). Upstream SDK moved raw event
+     * sending from Timeline to Room; this method proxies through.
+     *
+     * @param eventType The custom event type string
+     * @param content   The JSON-serialized event content
+     */
+    suspend fun sendRawEvent(eventType: String, content: String): Result<Unit>
 }