fix(ui): polish loading skeleton states

[prudentbird]

Summary

• redesign the base skeleton primitive with a surfaced shimmer treatment
• replace generic auth, root, sidebar, and chat loading screens with structured layouts
• align loader padding and max-width constraints with the real app shells

Verification

• pnpm lint
• pnpm typecheck
• pnpm build

---

Summary by cubic

Polished all loading skeletons with a new shimmer-based primitive and structured shells that mirror the real app. Improves visual consistency and perceived speed across auth, chat, and the sidebar, with reduced-motion support.

• Refactors
  • Rebuilt Skeleton with shimmer layers, light/dark styles, and a reduced-motion fallback.
  • Added ChatLoadingShell and used it for /chat and /chat/[id] loading routes.
  • Updated chat sidebar loader with SidebarHeader, SidebarContent, SidebarFooter, and SidebarMenuSkeleton to match the real shell.
  • Refreshed auth and root loaders with proper max-width, padding, and background treatments.
  • Added skeleton-shimmer keyframes in globals.css.

^{Written for commit ded65ce. Summary will update on new commits.}

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Project	Deployment	Actions	Updated (UTC)
fuseion	Error		Apr 3, 2026 11:03pm

[changeset-bot]

⚠️ No Changeset found

Latest commit: ded65ce

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 5ae4e9c1-077b-403d-9081-c2de2c514524

📥 Commits

Reviewing files that changed from the base of the PR and between 59253d4 and ded65ce.

📒 Files selected for processing (8)

• src/app/(auth)/auth/loading.tsx
• src/app/(chat)/chat/[id]/loading.tsx
• src/app/(chat)/chat/_components/chat-loading-shell.tsx
• src/app/(chat)/chat/loading.tsx
• src/app/(chat)/layout.tsx
• src/app/globals.css
• src/app/loading.tsx
• src/components/ui/skeleton.tsx

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/loader-skeleton-polish

---

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[cubic-dev-ai]

No issues found across 8 files