Redesign all pages to light theme (Qalby-inspired mobile UI)

Complete UI overhaul replacing dark gold theme with a clean mobile-first
light theme: gradient emerald headers, white card components, light backgrounds,
emerald/amber CTAs, and a new home dashboard with feature grid navigation.

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

next-env.d.ts

@@ -0,0 +1,6 @@
+/// <reference types="next" />
+/// <reference types="next/image-types/global" />
+import "./.next/types/routes.d.ts";
+
+// NOTE: This file should not be edited
+// see https://nextjs.org/docs/app/api-reference/config/typescript for more information.