style: rustfmt sweep — 107 files the lint gate never saw

This branch predates CI on `main`. `cargo fmt --all` only; no behaviour.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

crates/sylpheed-cli/src/main.rs

@@ -655,7 +655,9 @@ fn cmd_screen_render(
                 Some(t)
             }
             _ => {
-                println!("no settle window (fewer than two distinct keyframe times) — using rest()");
+                println!(
+                    "no settle window (fewer than two distinct keyframe times) — using rest()"
+                );
                 None
             }
         }