style: apply nightly rustfmt import grouping across the workspace

rustfmt.toml sets group_imports, imports_granularity and imports_layout,
which are nightly-only; agents formatted with stable rustfmt, which
ignored them. This is a formatting-only pass with `cargo +nightly fmt`.

Test Plan:
- cargo clippy --workspace --all-targets -- -D warnings
- cargo test --workspace

crates/ghostty-apprt-gtk/src/winproto/x11.rs

@@ -5,17 +5,16 @@
 //! comments.
 #![allow(unsafe_code)]
 
-use std::ffi::{c_int, c_long, c_uchar, c_uint, c_ulong, c_void};
-use std::rc::Rc;
+use std::{
+    ffi::{c_int, c_long, c_uchar, c_uint, c_ulong, c_void},
+    rc::Rc,
+};
 
-use gdk4_x11::x11::xlib;
-use gdk4_x11::{X11Display, X11Surface};
-use gtk::gdk;
-use gtk::glib;
-use gtk::prelude::*;
+use gdk4_x11::{X11Display, X11Surface, x11::xlib};
+use ghostty_input::Mods;
+use gtk::{gdk, glib, prelude::*};
 
 use super::{Error, Result, WindowHost};
-use ghostty_input::Mods;
 
 // XKB bits we need that the `x11` crate doesn't expose (XKBlib.h / XKB.h).
 const XKB_MAJOR_VERSION: c_int = 1;