fix: add CSS variables for status colors to playground

Added error, warning, success, and info color CSS variables to
playground globals.css so that Badge component variants display
with correct colors. The error variant will now show red as expected.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

apps/playground/src/app/globals.css

@@ -1,3 +1,30 @@
 @tailwind base;
 @tailwind components;
 @tailwind utilities;
+
+@layer base {
+  /* Light mode (default) */
+  :root {
+    /* Status Colors */
+    --error: 0 65% 51%; /* Red */
+    --error-foreground: 0 0% 100%; /* White text */
+    --warning: 36 100% 50%; /* Amber */
+    --warning-foreground: 0 0% 100%;
+    --success: 152 57% 45%; /* Green */
+    --success-foreground: 0 0% 100%;
+    --info: 210 100% 56%; /* Blue */
+    --info-foreground: 0 0% 100%;
+  }
+
+  /* Dark mode */
+  .dark {
+    --error: 0 65% 58%; /* Brighter red for dark mode */
+    --error-foreground: 0 0% 100%;
+    --warning: 36 100% 55%;
+    --warning-foreground: 0 0% 100%;
+    --success: 152 57% 50%;
+    --success-foreground: 0 0% 100%;
+    --info: 210 100% 60%;
+    --info-foreground: 0 0% 100%;
+  }
+}