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-renderer/src/link.rs

@@ -2,10 +2,11 @@
 
 use std::collections::HashSet;
 
-use ghostty_input::Mods;
-use ghostty_input::link::{Highlight, Link as InputLink};
-use ghostty_terminal::point::Coordinate;
-use ghostty_terminal::render::RenderState;
+use ghostty_input::{
+    Mods,
+    link::{Highlight, Link as InputLink},
+};
+use ghostty_terminal::{point::Coordinate, render::RenderState};
 use onig::{Regex, Region, SearchOptions};
 
 #[derive(Debug, thiserror::Error)]
@@ -155,10 +156,11 @@ impl Set {
 
 #[cfg(test)]
 mod tests {
-    use super::*;
     use ghostty_input::link::Action;
     use ghostty_terminal::terminal::{Options, Terminal};
 
+    use super::*;
+
     fn link(regex: &str, highlight: Highlight) -> InputLink {
         InputLink {
             regex: regex.to_string(),