refactor(cli): name the set sort_unique builds

`sort_unique` collected its names into a `HashSet`, walked straight
back out of it, and collected again, all in one expression — the set
that does the deduplicating had no name. The only chain in the workspace
that `perfectionist::collection_round_trip` flags.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CWntUqQ2mPR1yxZNbAYNUg

pnpm/crates/cli/src/cli_args/approve_builds.rs

@@ -288,7 +288,8 @@ pub(crate) fn clear_decided_ignored_builds(
 /// Deduplicate and sort `names` by code unit, matching pnpm's
 /// `sortUniqueStrings` (a `Set` then `lexCompare`).
 fn sort_unique(names: Vec<String>) -> Vec<String> {
-    let mut unique: Vec<String> = names.into_iter().collect::<HashSet<_>>().into_iter().collect();
+    let deduplicated: HashSet<String> = names.into_iter().collect();
+    let mut unique: Vec<String> = deduplicated.into_iter().collect();
     unique.sort();
     unique
 }