Fixed two visual issues with the navbar:
1. Removed black border line when transparent: Changed borderBottom to
conditionally be 'none' instead of '1px solid transparent', which was
showing up as a visible line when the navbar is transparent on homepage
2. Added 10px gradient fade at bottom: Applied linear-gradient that fades
from the dark background to transparent over the last 10px, creating a
softer transition instead of a sharp cut-off
The navbar now seamlessly blends into the page content with no visual artifacts.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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