add onboarding flow with form, validation, db persistence

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

package.json

@@ -15,8 +15,10 @@
 	"dependencies": {
 		"@electric-sql/pglite": "^0.3.16",
 		"@tailwindcss/vite": "^4.2.1",
+		"@tanstack/react-form": "^1.28.4",
 		"@tanstack/react-router": "^1.166.7",
 		"@tanstack/router-plugin": "^1.166.7",
+		"@tanstack/zod-form-adapter": "^0.42.1",
 		"class-variance-authority": "^0.7.1",
 		"clsx": "^2.1.1",
 		"lucide-react": "^0.577.0",