Fix rollout history loading and active tab

[arjunkomath]

Summary

• Replace the rollout history spinner with a skeleton list while data loads
• Add a loading skeleton for rollout detail pages
• Keep the Deployments tab active when viewing rollout details

Verification

• pnpm exec tsc --noEmit --pretty false
• pnpm exec biome check components/service/details/rollout-history.tsx components/service/service-layout-client.tsx app/'(dashboard)'/dashboard/projects/'[slug]'/'[env]'/services/'[serviceId]'/rollouts/'[rolloutId]'/loading.tsx

[github-actions]

React Doctor found no new issues. 🎉

_{Reviewed by React Doctor for commit b8d6252.}