ci(deploy-web): bump Node to 22 for wrangler@4 (#1111)

wrangler 4 requires Node.js >=22; the deploy job was pinned to 20
and failed at `npx wrangler deploy` with "Wrangler requires at
least Node.js v22.0.0".

Co-authored-by: Claude Opus 4.7 (1M context) <[email protected]>

.github/workflows/deploy-web.yml

@@ -41,7 +41,8 @@ jobs:
 
       - uses: actions/setup-node@v4
         with:
-          node-version: 20
+          # wrangler@4 requires Node 22+
+          node-version: 22
           cache: npm
           cache-dependency-path: web/package-lock.json