This is pretty much a direct port of the previous GTK app. still inside
of the `isActive` handler for a window


https://github.com/ghostty-org/ghostty/blob/7e429d73d6af65a397c6264b18ab60609ae8eefe/src/apprt/gtk/Window.zig#L822-L837

Fixes: https://github.com/ghostty-org/ghostty/discussions/9137

Clicking on desktop notifications sent by Ghostty _should_ cause the
window that sent the notification to come to the top. However, because
the notification that was sent targeted the wrong surface (apprt surface
vs core surface) and the window did not call `present()` on itself the
window would never be brought to the surface, the correct tab would not
be selected, etc.

Fixes #9145

Log messages will include the problematic CSS, simplifying debugging.
Especially helpful since some of our CSS is generated at runtime so it
could be difficult to examine the CSS "source".

```
info(gtk_ghostty_application): loading gtk-custom-css path=/home/ghostty/dev/ghostty/x.css
warning(gtk_ghostty_application): css parsing failed at <data>:2:3-14: gtk-css-parser-error-quark 4 No property named "border-poop"
* {
  border-poop: 0;

warning(gtk_ghostty_application): css parsing failed at <data>:1:3-3:1: gtk-css-parser-warning-quark 1 Unterminated block at end of document
* {
  border-poop: 0;
```

vs:

```
info(gtk_ghostty_application): loading gtk-custom-css path=/home/ghostty/dev/ghostty/x.css
warning(glib): WARNING: Gtk: Theme parser error: <data>:2:3-14: No property named "border-poop"
warning(glib): WARNING: Gtk: Theme parser warning: <data>:1:3-3:1: Unterminated block at end of document
```

Fixes #9052