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-vt/src/parser.rs

@@ -13,8 +13,7 @@
 //! through `params()` / `intermediates()` accessors, so an `Action` owns its
 //! data and is independent of the parser's lifetime.
 
-use crate::osc;
-use crate::parse_table::TABLE;
+use crate::{osc, parse_table::TABLE};
 
 /// Maximum number of CSI parameters. This is a const in Ghostty so we
 /// match it.