fix: replace frontend with Rust OPAQUE API + Flutter keypad UI

- Full OPAQUE auth flow via WASM client SDK (client-wasm crate)
- New user: Key Register → Key Login → Code Register (icon selection) → done
- Existing user: Key Login → get login-data → icon keypad → Code Login → done
- Icon-based keypad matching Flutter design:
  - 2 cols portrait, 3 cols landscape
  - Key tiles with 3-col sub-grid of icons
  - Navy border press feedback
  - Dot display with backspace + submit
- SVGs rendered as-is (no color manipulation)
- SusiPage with Login/Signup tabs
- LoginKeypadPage and SignupKeypadPage for code flows
- Secret key display/copy on signup
- Unit tests for Keypad component
- WASM pkg bundled locally (no external dep)

vite.config.ts

@@ -1,12 +1,36 @@
+/// <reference types="vitest/config" />
 import { defineConfig } from 'vite'
 import react from '@vitejs/plugin-react'
 import tailwindcss from '@tailwindcss/vite'
+import wasm from 'vite-plugin-wasm'
+import topLevelAwait from 'vite-plugin-top-level-await'
+import path from 'path'
 
 export default defineConfig({
-  plugins: [react(), tailwindcss()],
+  plugins: [react(), tailwindcss(), wasm(), topLevelAwait()],
+  test: {
+    globals: true,
+    environment: 'jsdom',
+    setupFiles: ['./src/__tests__/setup.ts'],
+    css: true,
+  },
   resolve: {
     alias: {
-      '@': '/src',
+      'nkode-client-wasm': path.resolve(__dirname, 'pkg'),
     },
   },
+  server: {
+    proxy: {
+      '/v1': {
+        target: 'http://localhost:3000',
+        changeOrigin: true,
+      },
+    },
+    fs: {
+      allow: ['..'],
+    },
+  },
+  optimizeDeps: {
+    exclude: ['nkode-client-wasm'],
+  },
 })