VideoPress: improve the user experience on Offline mode
More context here p9dueE-7eT-p2 Reported by @sergeymitr
On Offline mode, the plugin doesn’t handle connection errors very well, and users get stuck with the spinner if Offline Mode is on:

Same goes for other site registration errors, we probably need to check the returned promise for errors here.
This issue has been marked as stale. This happened because:
- It has been inactive for the past 6 months.
- It hasn’t been labeled `[Pri] BLOCKER`, `[Pri] High`, `[Type] Feature Request`, `[Type] Enhancement`, `[Type] Janitorial`, `Good For Community`, `[Type] Good First Bug`, etc.
No further action is needed. But it's worth checking if this ticket has clear reproduction steps and it is still reproducible. Feel free to close this issue if you think it's not valid anymore — if you do, please add a brief explanation.
@vianasw for awareness
This issue has been marked as stale. This happened because:
- It has been inactive for the past 6 months.
- It hasn’t been labeled `[Pri] BLOCKER`, `[Pri] High`, `[Type] Feature Request`, `[Type] Enhancement`, `[Type] Janitorial`, `Good For Community`, `[Type] Good First Bug`, etc.
No further action is needed. But it's worth checking if this ticket has clear reproduction steps and it is still reproducible. Feel free to close this issue if you think it's not valid anymore — if you do, please add a brief explanation.
I'll reopen this if that's okay with you, since it's still an ongoing issue.