mod: use unbuffered streaming writer for TUIs

examples/direct.zig

@@ -166,7 +166,7 @@ pub fn main(init: std.process.Init) !void {
             }
 
             // NOTE returned errors should be propagated back to the application
-            container.handle(&app.model, event) catch |err| try app.postEvent(.{
+            container.handle(io, &app.model, event) catch |err| try app.postEvent(.{
                 .err = .{
                     .err = err,
                     .msg = "Container Event handling failed",