feat(UI): implement dark theme for courses page

[mdimado]

• Implemented gradient background (from-slate-950 to-indigo-950) to match homepage
• Updated course cards with semi-transparent dark backgrounds and backdrop blur
• Added consistent violet accent colors across components

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[deepsource-io]

Here's the code health analysis summary for commits 9f3fee0..450ccc7. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
JavaScript	❌ Failure	❗ 1 occurence introduced 🎯 1 occurence resolved	View Check ↗

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[yours7himanshu]

@mdimado Thank u for your work