feat(frontend): Kinetic Precision design system — new lime theme, glassmorphism, redesigned pages

- New design system: Stitch (kinetic-precision.css) with lime (#cafd00) accent
- New Google Fonts: Lexend, Plus Jakarta Sans, Space Grotesk
- New page: BenchmarksPage with strength/endurance/body tracking
- Redesigned: Dashboard, ProgressPage, WorkoutPage, LoginPage + LoginPage.css
- Add shared glassmorphism nav, kinetic buttons, intensity indicators
- Build: 265KB JS / 88KB CSS / 2.54s (clean)

scripts/preflight/01-dns-check.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+# DNS Validation for Production Ingress
+NAMESPACE="gravl-prod"
+echo "Checking DNS records for $NAMESPACE..."
+kubectl get ingress -n "$NAMESPACE" -o jsonpath='{.items[*].spec.rules[*].host}' | \
+  tr ' ' '\n' | while read host; do
+    if [ -n "$host" ]; then
+      resolved=$(dig +short "$host" 2>/dev/null | head -1 || echo "UNRESOLVED")
+      echo "  $host → $resolved"
+    fi
+  done