Audit light/dark mode and contrast

[jovanadinic]

Description:
Some UI areas should be reviewed in both light and dark mode to ensure enough contrast, readability, and consistent appearance across the application.

Tasks:

• Check all main pages in light and dark mode.
• Review text contrast, button contrast, borders, cards, labels, and disabled states.
• Adjust low-contrast elements where necessary.
• Ensure interactive elements remain clearly recognizable in both modes.

Acceptance Criteria:

• Important text is readable in both modes.
• Buttons and interactive elements are clearly visible.
• Cards, borders, and subtle UI elements do not disappear visually.
• Light and dark mode feel equally polished.