Critical: All workspace, projects, etc missing after auto update

### Expected Behavior

All my saved data to remain.

### Actual Behavior

Everything is missing and new scratchpad was in its place.

### Reproduction Steps

_No response_

### Is there an existing issue for this?

- [x] I have searched the [issue tracker](https://www.github.com/Kong/insomnia/issues) for this problem.

### Which sync method do you use?

- [ ] Git sync.
- [ ] Insomnia Cloud sync.
- [x] Local only

### Additional Information

happen to update to 12.x

### Insomnia Version

12.4

### What operating system are you using?

Windows

### Operating System Version

Windows 11 Enterprise 25H2

### Installation method

from insomnia.rest

### Last Known Working Insomnia version

before 12.10

No source files, tests, or reproduction steps are named. Start by reproducing the loss on Windows 11 with local-only storage while comparing the pre-12.10 version with Insomnia 12.4. Done means saved workspaces and projects remain available after updating to the affected 12.x release.

Written by the indexing model from the issue text.