fix(server): safely drop detached tokio join handles and refactor timestamp boilerplate

server/build.rs

@@ -12,7 +12,8 @@ fn main() {
 
     let is_dirty = Command::new("git")
         .args(["status", "--porcelain"])
-        .output().is_ok_and(|out| !out.stdout.is_empty());
+        .output()
+        .is_ok_and(|out| !out.stdout.is_empty());
 
     if is_dirty {
         git_hash.push_str("-dirty");