M10 (2013): rustfmt integration.rs (wrap perm chain)

cargo fmt --check wanted the fs::metadata(p).map_err(..)?.permissions() chain
wrapped (>100 cols). Fixes desktop build #2829; the frontend already typechecked
clean in that run.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FRgehjoz7Yv8LkUfADxACm

desktop/src-tauri/src/integration.rs

@@ -134,7 +134,9 @@ fn remove_if_exists(p: &Path) -> Result<(), String> {
 #[cfg(unix)]
 fn set_executable(p: &Path) -> Result<(), String> {
     use std::os::unix::fs::PermissionsExt;
-    let mut perm = fs::metadata(p).map_err(|e| format!("stat: {e}"))?.permissions();
+    let mut perm = fs::metadata(p)
+        .map_err(|e| format!("stat: {e}"))?
+        .permissions();
     perm.set_mode(0o755);
     fs::set_permissions(p, perm).map_err(|e| format!("chmod: {e}"))
 }