feat: add Settings and Suite pages with comprehensive settings management and question suite builder

- Implemented SettingsPage for configuring default provider, temperature, and model paths.
- Added SuitePage for managing a suite of questions with features to add, edit, duplicate, and delete questions.
- Introduced TypeScript configuration files for app and node environments.
- Set up Vite configuration for development server with API proxying to backend.

web/vite.config.ts

@@ -0,0 +1,31 @@
+import { defineConfig } from 'vite'
+import react from '@vitejs/plugin-react'
+import tailwindcss from '@tailwindcss/vite'
+
+// The Python server owns /api. In dev, Vite serves the UI on :5173 and proxies
+// API + SSE calls through to uvicorn on :8765 so both share one origin.
+export default defineConfig({
+  plugins: [react(), tailwindcss()],
+  server: {
+    port: 5173,
+    proxy: {
+      '/api': {
+        target: 'http://127.0.0.1:8765',
+        changeOrigin: true,
+        // Server-sent events must not be buffered by the proxy.
+        configure: (proxy) => {
+          proxy.on('proxyRes', (proxyRes) => {
+            if (proxyRes.headers['content-type']?.includes('text/event-stream')) {
+              delete proxyRes.headers['content-length']
+            }
+          })
+        },
+      },
+    },
+  },
+  build: {
+    outDir: 'dist',
+    emptyOutDir: true,
+    chunkSizeWarningLimit: 900,
+  },
+})