Format the tree the way the gate asks for it

`cargo fmt --check` is a required step and had drifted across 45 files. Most of
it arrived this week: several operations were written in parallel worktrees and
merged by hand, and a hand-merge resolves conflicts without ever running the
formatter over the result.

No behaviour changes — this is `cargo fmt --all` and nothing else, kept as its
own commit so the next reader can skip it wholesale rather than search it for
one that matters.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

ui/dr-ui/src/presets.rs

@@ -318,8 +318,8 @@ fn refresh_thumbnail_for(
     session: &Rc<RefCell<Option<DevelopSession>>>,
     library: &Rc<library_ui::LibraryController>,
 ) {
-    let worth_it = window.get_can_undo()
-        || session.borrow().as_ref().is_some_and(|s| !s.is_neutral());
+    let worth_it =
+        window.get_can_undo() || session.borrow().as_ref().is_some_and(|s| !s.is_neutral());
     if !worth_it {
         return;
     }