Function ensure_file_db_synced 

pub fn ensure_file_db_synced(
    force: bool,
    max_age_days: u64,
) -> Result<bool, String>

What: Attempt a best-effort synchronization of the pacman file database.

Inputs:

• force: If true, sync regardless of timestamp. If false, only sync if stale.
• max_age_days: Maximum age in days before considering the database stale (default: 7).

Output:

• Returns Ok(true) if sync was performed, Ok(false) if sync was skipped (fresh DB), Err if sync failed.

Errors

• Returns Err when pacman -Fy command execution fails (I/O error)
• Returns Err when pacman -Fy exits with non-zero status

Details:

• Checks timestamp first if force is false, only syncing when stale.
• Intended to reduce false negatives when later querying remote file lists.