Fix WCAG AA color contrast violations across all pages

Replace incorrect perceived-brightness formula in Stats progress bars
with proper WCAG relative luminance calculation, and convert type bar
colors to hex values for reliable contrast detection. Add light: variant
classes to status badges, yellow/purple text, and admin nav links across
17 files. Darken light-mode status-active token and text-tertiary/muted
tokens. Add aria-labels to admin filter selects and flex-wrap for mobile
overflow on AdminEvolutions.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.beans/nuzlocke-tracker-1qzo--fix-wcag-aa-color-contrast-violations.md

@@ -0,0 +1,9 @@
+---
+# nuzlocke-tracker-1qzo
+title: Fix WCAG AA color contrast violations
+status: completed
+type: bug
+priority: high
+created_at: 2026-02-20T19:19:32Z
+updated_at: 2026-02-20T19:20:25Z
+---