Add Next.js 15 app skeleton with Tailwind v4 and shadcn/ui

Next.js 15 + React 19, Tailwind v4, shadcn/ui (button, card, input,
dialog), postcss config, standalone output. ESLint extended with
next/core-web-vitals via eslint-config-next flat export. node-linker=hoisted
in .npmrc to allow standalone builds on Windows (symlink restriction).
next-env.d.ts added to .gitignore.

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

tsconfig.json

@@ -1,7 +1,11 @@
 {
   "compilerOptions": {
     "target": "ES2022",
-    "lib": ["ES2023", "DOM", "DOM.Iterable"],
+    "lib": [
+      "ES2023",
+      "DOM",
+      "DOM.Iterable"
+    ],
     "module": "ESNext",
     "moduleResolution": "bundler",
     "resolveJsonModule": true,
@@ -20,10 +24,28 @@
     "jsx": "preserve",
     "incremental": true,
     "baseUrl": ".",
+    "plugins": [
+      {
+        "name": "next"
+      }
+    ],
     "paths": {
-      "@/*": ["src/*"]
+      "@/*": [
+        "src/*"
+      ]
     }
   },
-  "include": ["src/**/*", "*.ts", "*.mts", "*.cts"],
-  "exclude": ["node_modules", ".next", "dist", "drizzle"]
+  "include": [
+    "*.cts",
+    "*.mts",
+    "*.ts",
+    "src/**/*",
+    ".next/types/**/*.ts"
+  ],
+  "exclude": [
+    "node_modules",
+    ".next",
+    "dist",
+    "drizzle"
+  ]
 }