fix: override rootDir in web tsconfig to "." for Next.js compat

Next.js generates .next/types/ files that must be under rootDir.
Base tsconfig sets rootDir to "src", web needs "." to include both
src/ and .next/types/.

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

packages/web/tsconfig.json

@@ -2,6 +2,7 @@
   "extends": "../../tsconfig.base.json",
   "compilerOptions": {
     "outDir": "dist",
+    "rootDir": ".",
     "jsx": "preserve",
     "module": "ESNext",
     "moduleResolution": "Bundler",