refactor(store): migrate device-id hook to @multica/store

- Move useDeviceId from apps/web to packages/store/src/device-id.ts
- Update imports in chat.tsx and use-gateway.ts to use @multica/store
- Add uuid dependency to @multica/store

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

packages/ui/src/components/hub-sidebar.tsx

@@ -68,7 +68,7 @@ export function HubSidebar() {
         <SidebarGroup>
           <SidebarGroupLabel>Agents</SidebarGroupLabel>
           <SidebarGroupAction onClick={() => createAgent()} title="Create agent">
-            <HugeiconsIcon icon={PlusSignIcon} strokeWidth={2} className="size-4" />
+            <HugeiconsIcon icon={PlusSignIcon} />
           </SidebarGroupAction>
           <SidebarGroupContent>
             <SidebarMenu>