fix(web): add missing react-swipeable dependency

`apps/web/components/listings/image-gallery.tsx` imports
`useSwipeable` from `react-swipeable`, but the package was never
declared in `apps/web/package.json`. The dev install resolved it
through hoisted node_modules locally so nobody noticed; the in-cluster
Kaniko `next build` then fails with:

  Module not found: Can't resolve 'react-swipeable'
  ./components/listings/image-gallery.tsx:5:1

Fix by declaring `react-swipeable@^7.0.2` as a real dependency of the
web workspace so pnpm-lock + Docker builds resolve it deterministically.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/web/package.json

@@ -27,6 +27,7 @@
     "react": "^18.3.0",
     "react-dom": "^18.3.0",
     "react-hook-form": "^7.72.1",
+    "react-swipeable": "^7.0.2",
     "recharts": "^3.8.1",
     "socket.io-client": "^4.8.3",
     "sonner": "^2.0.7",