Fix GTK fractal message handling on Windows#290
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This fixes a Windows-specific GTK startup/render hang in the fractal widget message pipe.\n\nChanges:\n- keep the normal Gtk.Application ID path on Linux, but use a non-unique application without an ID on Windows\n- avoid Gtk.ApplicationWindow menubar setup on Windows where it can prevent normal display\n- make the fractal worker pipe non-blocking and parse complete messages from a persistent buffer\n- use timed polling on Windows instead of GLib.io_add_watch for os.pipe(), while keeping the original io_add_watch path on Linux\n- defer formula compilation until draw time so window construction does not block startup\n\nTested on Windows with MSYS2/GTK4: GUI starts, remains responsive, and renders the initial Mandelbrot view.