feat(ui): add background colors and padding to headers for better visibility and layout consistency

[raymundo-salazar]

PR Description

This PR fixes styling issues where headers in various sidebar panels appeared transparent or lacked proper spacing, affecting readability during scrolling.

Key Changes:

• Added background colors to headers in the Dependencies, Console, and History sections to ensure they remain visible and distinct.
• Adjusted padding across these headers to improve layout consistency and alignment.
• Fixed the transparency issue reported when scrolling through search results and panel content.

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Screenshots / Evidence

Dependencies Section Header

Before	After

Console Section Header

Before	After

History Section Header

Before	After

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Related Issue: #283