feat: Handle Safari-mangled backup ZIPs and improve backup UI #3674
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What type of PR is this?
(REQUIRED)
What this PR does / why we need it:
(REQUIRED)
We've had several instances like this where Safari mangles the ZIP file structure, breaking our backups. This PR adds some logic to detect when this happens and work around it.
The UI is also very unhelpful when backups fail, so this PR fixes some state issues and flashes an alert to check server logs when a backup fails.
Which issue(s) this PR fixes:
(REQUIRED)
No open issues, several closed ones where the solution was just to fix the ZIP structure
Testing
(fill-in or delete this section)
I added a mangled zip file test before implementing the workaround, confirmed it failed, and now it passes