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-inspector/src/widgets/key.rs

@@ -3,8 +3,7 @@
 use std::collections::VecDeque;
 
 use dear_imgui_rs::{InputTextFlags, TableColumnFlags, TableColumnWidth, TableFlags, Ui};
-use ghostty_input::binding::Action as BindingAction;
-use ghostty_input::{Action, Key, KeyEvent, Mods};
+use ghostty_input::{Action, Key, KeyEvent, Mods, binding::Action as BindingAction};
 
 /// The maximum number of recorded events (Zig: the ring grows by doubling up
 /// to this capacity, after which the oldest event is dropped).