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-font/src/face/freetype.rs

@@ -6,14 +6,18 @@
 //!
 //! Port of `font/face/freetype.zig`.
 
-use std::ffi::CString;
-use std::sync::{Arc, Mutex, MutexGuard, PoisonError};
+use std::{
+    ffi::CString,
+    sync::{Arc, Mutex, MutexGuard, PoisonError},
+};
 
 use super::{DesiredSize, FontData, FreetypeLoadFlags, Options, RenderOptions, Variation};
-use crate::atlas::{self, Atlas};
-use crate::glyph::Glyph;
-use crate::library::Library;
-use crate::metrics::FaceMetrics;
+use crate::{
+    atlas::{self, Atlas},
+    glyph::Glyph,
+    library::Library,
+    metrics::FaceMetrics,
+};
 
 pub(crate) mod ft;
 mod resize;

crates/ghostty-font/src/face/freetype/ft.rs

@@ -8,8 +8,10 @@
 // c_long is i64 on Linux but not everywhere; keep the casts portable.
 #![allow(clippy::unnecessary_cast)]
 
-use std::ffi::{CStr, c_int, c_long, c_uint, c_ulong, c_void};
-use std::ptr::{self, NonNull};
+use std::{
+    ffi::{CStr, c_int, c_long, c_uint, c_ulong, c_void},
+    ptr::{self, NonNull},
+};
 
 use freetype_sys as sys;