bug: Update - During the migration of extensions with each update, the Jan app shows blank white page which is confusing

[Van-QA]

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Describe the bug Regarding the white window issue, if you are using the nightly build, the most likely cause is the migration of extensions with each update (required for the new document upload feature - RAG). We will include a loading indicator as well as additional checks to reduce migration time. https://discord.com/channels/1107178041848909847/1201839982923485184/1202285657511428136

Steps to reproduce Steps to reproduce the behavior:

1. Open Jan with a newer version available
2. Allow update
3. Observe the loader

Expected behavior There should be a loader to indicate that the Jan app is still responsive

Screenshots

Environment details

• Operating System: MacOS
• Jan Version: latest nightly build
• Processor: Apple M2 Pro
• RAM: 16GB

Logs If the cause of the error is not clear, kindly provide your usage logs:

• tail -n 50 ~/jan/logs/app.log if you are using the UI
• tail -n 50 ~/jan/logs/server.log if you are using the local api server Making sure to redact any private information.

Additional context Add any other context or information that could be helpful in diagnosing the problem.