chore: initialize Vite project with Automerge dependencies

Set up project scaffold for a P2P polling app:
- package.json with @automerge/vanillajs, automerge-repo, vite deps
- vite.config.js with wasm and top-level-await plugins required by Automerge
- pnpm-lock.yaml lockfile
- .gitignore excluding node_modules

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

.gitignore

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+node_modules/

package.json

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+{
+  "name": "p2p-poll-app",
+  "type": "module",
+  "engines": {
+    "node": ">=24"
+  },
+  "scripts": {
+    "dev": "vite",
+    "build": "vite build",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "@automerge/automerge-repo": "^2.0.0",
+    "@automerge/automerge-repo-network-websocket": "^2.0.0",
+    "@automerge/automerge-repo-storage-indexeddb": "^2.0.0",
+    "@automerge/vanillajs": "^2.5.3"
+  },
+  "devDependencies": {
+    "vite": "^6.0.0",
+    "vite-plugin-top-level-await": "^1.4.0",
+    "vite-plugin-wasm": "^3.3.0"
+  }
+}

vite.config.js

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+import { defineConfig } from 'vite'
+import wasm from 'vite-plugin-wasm'
+import topLevelAwait from 'vite-plugin-top-level-await'
+
+export default defineConfig({
+  plugins: [wasm(), topLevelAwait()]
+})