[Enhancement] adjust inactive button style for a11y

[edschema]

Current State
The inactive button state appears as below. This contrast ratio does not meat WCAG guidelines for accessibility.

Proposed Fix
For inactive buttons, change colors:
Light theme:

• button background: light theme - light: #CCD4E0
• button text: light theme - secondary dark: #3D4964

Dark theme:

• button background: dark theme - light: #8E9BAE
• button text: dark theme - Dark: #19212F