Function acquire_lock_async 

pub async fn acquire_lock_async(
    path: &Path,
    timeout: Duration,
) -> Result<LockGuard>

Acquire an exclusive flock on path, blocking up to timeout. Returned guard releases the lock on drop.

The flock file is created if missing, but its content is unused — only the lock matters. Async wrapper around acquire_lock.

The blocking version parks the calling thread in a sleep loop for up to timeout. On a current-thread runtime — which is what the TUI uses — that stalls everything: keyboard input, the refresh timer, and every other vendor’s in-flight request. Running the wait on the blocking pool keeps the reactor free while a contended lock is waited on.