Issue #2 - [BUG] Sidebar header text unreadable with certain theme lightness settings

[zenocross]

Description

When adjusting the lightness level of screen themes, sidebar header texts in the explorer become unreadable due to poor contrast between text and background colors.

Current Behavior

• Changing theme lightness affects sidebar colors
• Header text contrast becomes insufficient
• Text is difficult or impossible to read in certain lightness configurations

Expected Behavior

Sidebar header text should remain readable with adequate contrast across all theme lightness settings.

Steps to Reproduce

1. Open Puter explorer
2. Navigate to theme settings
3. Adjust the lightness slider to various levels
4. Observe sidebar header text becoming unreadable at certain lightness values

Proposed Solution

Implement dynamic contrast adjustment for sidebar header text colors that adapts to the current theme lightness setting, ensuring WCAG accessibility standards are met.

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