add client: React + Vite + Capacitor prototype

Web app React 18 + TypeScript con quattro schermate: Setup (URL server +
password + test connessione), Ingredients (lista ingredienti e preferenze),
Recipes (lista 3 ricette generate), RecipeDetail (dettaglio e procedimento).
Persistenza URL/password via Capacitor Preferences. Pronto per build Android.

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

client/tsconfig.json

@@ -0,0 +1,21 @@
+{
+  "compilerOptions": {
+    "target": "ES2020",
+    "useDefineForClassFields": true,
+    "lib": ["ES2020", "DOM", "DOM.Iterable"],
+    "module": "ESNext",
+    "skipLibCheck": true,
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    "noEmit": true,
+    "jsx": "react-jsx",
+    "strict": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noFallthroughCasesInSwitch": true
+  },
+  "include": ["src"],
+  "references": [{ "path": "./tsconfig.node.json" }]
+}