feat: Graceful failure for model loading (not `Something's Amiss` Error)

[imtuyethan]

• [x] I have searched the existing issues

Background

I'm always frustrated when users encounter vague "Something's Amiss" errors that don't provide actionable information, especially for common issues like VRAM limitations when loading large models. This leads to confusion and extra support requests.

Feature request

Implement improved error handling in Jan. Some issues that potentially cause this error:

• [ ] OOO (VRAM) https://discord.com/channels/1107178041848909847/1279214570346512425
• [ ] [to be updated]

Proposed Implementation

Based on the lates discussion, it's current pending collecting crash report from users #ana

Additional Notes

No response

[0xSage]

We should bubble up cortex errors Part of a longer discussion here https://github.com/orgs/janhq/projects/5/views/47?pane=issue&itemId=78540537