Improved UI, added code styling and dark mode

[onuratakan]

No description provided.

[sentry-io]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: upsonic_on_prem/dash/app/views.py

Function	Unhandled Issue
complate_ai_task	User.DoesNotExist: User matching query does not exist. /complate_a... Event Count: 1
complate_ai_task	NameError: name 'key' is not defined /complate_ai... Event Count: 1

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