[19.0][IMP] fs_folder: Disable FsFolderItem clicks while processing

[quoc-pn]

Summary

Fix race conditions in FsFolder by preventing overlapping FsFolderItem actions from rapid clicks.

What changed

• Added a single in-flight lock in FsFolder state.
• Routed item actions through the parent lock so only one action runs at a time.
• Released the lock in all cases (success or failure).

Result

• No duplicate item actions from double/rapid clicks.
• View interaction is restored reliably after each action.

[lmignon]

Thank you @quoc-pn Fot the fix. I'm no a JS specialist.... so I'll take time to analyse your change and see if it's the right pattern (at least for my internal knowledge)