feat: Added ability to copy the download link of a model

[axetroy]

Problem

I got a bad network, and I cannot download the model from explorer directly.

So I may want to copy the download link, download it myself, and then import the model.

Or improve the UX of Explorer, It's been stuck at 0% for too long and can't be canceled.

Success Criteria

Additional context

[Van-QA]

hi @axetroy, There are multiple options for your cases:

1. You can easily find the download link of the model in the jan data folder: jan/models and there should be a bunch of model.json in side each model folder, where you can get the link: source > url

2. Using Https proxy settings for the download from Hub: https://jan.ai/docs/advanced#https-proxy

On the other hand, we will try to resolve the 0% issue: https://github.com/janhq/jan/issues/2568 Many thanks

[Van-QA]

Feel free to reopen if any concerns. 🙏