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/src/action.rs

@@ -3,14 +3,14 @@
 //! C-ABI plumbing (`C`, `CValue`, `cval`, `ghostty.h` sync tests) is not
 //! ported; the enums keep their C integer discriminants via `as i32`.
 
-use crate::surface::{ChildExited, RendererHealth, Scrollbar};
-use ghostty_config::config::Config;
-use ghostty_config::types_b::Duration;
-use ghostty_input::binding::Trigger;
-use ghostty_vt::mouse_shape::MouseShape;
-use ghostty_vt::osc::ProgressReport;
 use std::sync::Arc;
 
+use ghostty_config::{config::Config, types_b::Duration};
+use ghostty_input::binding::Trigger;
+use ghostty_vt::{mouse_shape::MouseShape, osc::ProgressReport};
+
+use crate::surface::{ChildExited, RendererHealth, Scrollbar};
+
 /// The target for an action. This is generally the thing that had focus
 /// while the action was made but the concept of "focus" is not guaranteed
 /// since actions can also be triggered by timers, scripts, etc.