Port AtomCMS atom theme faithfully (Tailwind v4 + real CSS/assets + shell)

Make the template match the atom theme, not just approximate it:
- Add Tailwind v4 (+forms/typography plugins, postcss) and port the real atom
  CSS (global.css + atom app.css) into globals.css: nav-item underline, currency
  + navigation icon classes, site-bg, card-base/hover-lift, text utils — asset
  paths adapted to /assets.
- Copy the real theme assets (backgrounds, icons/currency/navigation, profile,
  leaderboards) into public/assets.
- Rebuild the shell 1:1 from the atom Blade: TopHeader (currency pills +
  user/admin dropdowns, auth-only), SiteHeader (header image + black/50 overlay,
  logo+online+Nitro client / guest Login+Create-account CTA), Navigation (white
  bar, nav-item + Community/Assistance dropdowns), Footer. ThemeVars injects the
  DB-driven CSS custom properties into :root like app.blade.php. Layout uses the
  atom body/site-bg + grid-cols-12 max-w-7xl content wrapper.

Verified: tsc 0, next build exit 0; curl confirms the atom markup, compiled CSS
references the assets, and background-light.jpg + currency/navigation icons all
serve 200.

package.json

@@ -2,7 +2,9 @@
   "name": "atomcms-next",
   "private": true,
   "type": "module",
-  "engines": { "node": ">=22" },
+  "engines": {
+    "node": ">=22"
+  },
   "packageManager": "[email protected]",
   "scripts": {
     "dev": "next dev",
@@ -19,26 +21,36 @@
     "@prisma/client": "^7.8.0",
     "bcryptjs": "^3.0.2",
     "hash-wasm": "^4.12.0",
-    "nodemailer": "^6.9.0",
     "next": "^16.2.9",
     "next-auth": "5.0.0-beta.31",
+    "nodemailer": "^6.9.0",
     "otplib": "^12.0.1",
     "react": "^19.2.0",
     "react-dom": "^19.2.0",
     "zod": "^3.24.0"
   },
   "devDependencies": {
+    "@tailwindcss/forms": "^0.5.11",
+    "@tailwindcss/postcss": "^4.3.1",
+    "@tailwindcss/typography": "^0.5.20",
     "@types/node": "^22.10.0",
     "@types/nodemailer": "^6.4.0",
     "@types/react": "^19.2.0",
     "@types/react-dom": "^19.2.0",
     "dotenv": "^16.4.0",
+    "postcss": "^8.5.15",
     "prisma": "^7.8.0",
+    "tailwindcss": "^4.3.1",
     "tsx": "^4.19.0",
     "typescript": "^5.7.0",
     "vitest": "^2.1.0"
   },
   "pnpm": {
-    "onlyBuiltDependencies": ["esbuild", "prisma", "@prisma/client", "@prisma/engines"]
+    "onlyBuiltDependencies": [
+      "esbuild",
+      "prisma",
+      "@prisma/client",
+      "@prisma/engines"
+    ]
   }
 }