style: implement custom IDE scrollbars

[spiffamani]

Closes #286

Summary

Implemented custom styled scrollbars in the IDE to match the dark VS Code aesthetic.

Changes Made

ide/src/index.css

• Added Firefox fallback using scrollbar-width: thin and scrollbar-color with brand colors
• Set webkit scrollbar width and height to 8px
• Set scrollbar track background to transparent for overlay effect
• Styled scrollbar thumb using hsl(var(--border)) to match brand colors
• Added border-radius: 4px to thumb for smooth rounded appearance
• Added hover state on thumb using hsl(var(--muted-foreground)) for subtle feedback
• Added transition: background 0.2s ease for smooth hover animation
• Set scrollbar corner to transparent

Acceptance Criteria Met

• Webkit scrollbars styled globally (thin, dark thumb, transparent track)
• Firefox scrollbar-color implemented as fallback
• border-radius applied to thumb
• Hover state on thumb for premium feel

Brand visual identity maintained using existing CSS variables

[vercel]

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[0xVida]

Please resolve the conflicting files