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-terminal/src/search/active.rs

@@ -9,8 +9,10 @@
 //! and handling the active area moving as new lines are added to the bottom.
 
 use super::sliding_window::{Direction, SlidingWindow};
-use crate::highlight::Flattened;
-use crate::page_list::{NodeId, PageList};
+use crate::{
+    highlight::Flattened,
+    page_list::{NodeId, PageList},
+};
 
 #[derive(Debug)]
 pub struct ActiveSearch {
@@ -103,8 +105,7 @@ impl ActiveSearch {
 
 #[cfg(test)]
 mod tests {
-    use super::super::test_util::*;
-    use super::*;
+    use super::{super::test_util::*, *};
     use crate::point::Tag;
 
     fn check(list: &PageList, h: &Flattened, s: (u16, u32), e: (u16, u32)) {