design: color-blind safe palette for critical signals#190
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Overview
This PR refactors the critical-signal palette within src/index.css to implement a colorblind-safe design system compliant with WCAG 2.1 AA requirements. By shifting the semantic color definitions (Success, Warning, Error, Info, Pending), it ensures clear distinction under Protanopia, Deuteranopia, and Tritanopia simulations without relying on color hue alone to convey status.
Changes
Luminance & Saturation Calibration: Reconfigured the status utility token mappings inside src/index.css to introduce distinct contrast and luminance variances between alert states.
CVD-Safe Tokens: Adjusted critical feedback colors to remain distinct across the three major Color Vision Deficiency types (Protanopia, Deuteranopia, and Tritanopia).
Multi-Dimensional Affordance Support: Paired the underlying semantic adjustments to align seamlessly with paired icon layout components, satisfying the design requirement that color is never used as the sole indicator of structural information.
Verification
Tested contrast compliance profiles against AA accessibility baseline specifications across light and dark theme matrices.
Evaluated utility variations under simulated colorblind workspace filters to confirm layout visibility.
closes #154