mod: use unbuffered streaming writer for TUIs

examples/elements/button.zig

@@ -80,6 +80,13 @@ pub fn main(init: std.process.Init) !void {
     const io = init.io;
 
     var app: App = .init(allocator, io, .{});
+    var stdout = std.Io.File.stdout();
+    // var stdout_buffer: [4096]u8 = undefined;
+    // var writer = stdout.writerStreaming(io, &stdout_buffer);
+    var writer = stdout.writerStreaming(io, &.{});
+    const w = &writer.interface;
+    defer w.flush() catch |err| log.err("Could not flush: {any}", .{err});
+
     var renderer = zterm.Renderer.Buffered.init(allocator);
     defer renderer.deinit();