fix(web): replace Zustand device store with local useDeviceId hook

Move device ID logic from @multica/store (Zustand persist) into a
simple useDeviceId hook in the web app. SSR returns empty string,
client reads/writes localStorage directly — no hydration mismatch,
no suppressHydrationWarning needed.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/web/package.json

@@ -11,6 +11,7 @@
   "dependencies": {
     "@multica/store": "workspace:*",
     "@multica/ui": "workspace:*",
+    "uuid": "^13.0.0",
     "@hugeicons/core-free-icons": "^3.1.1",
     "@hugeicons/react": "^1.1.4",
     "next": "16.1.6",