Define severity-driven visual emphasis

ui/SEVERITY_VISUALS.md

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+Severity visual treatment:
+
+Low:
+- Neutral color
+- No animation
+
+Medium:
+- Accent color
+- Subtle hover animation
+
+High:
+- Strong color contrast
+- Brief entrance animation on appearance
+
+Critical:
+- High-contrast color
+- One-time attention animation on arrival
+- No looping or persistent motion