Fixissue876 - #931

Description

Skeleton loading placeholders were implemented three inconsistent ways across the codebase:

• ui/Skeleton.tsx used animate-pulse bg-gray-200 dark:bg-gray-700
• dashboard/dashboard-view.tsx had a custom SkeletonCard with a CSS shimmer animation (animate-[shimmer_1.4s_infinite]) and bg-white/5
• wallet/WalletButton.tsx used a dedicated .wallet-btn-skeleton CSS class
• Additionally, StreamListSkeleton was exported from Skeleton.tsx but never imported anywhere

Type of Change

• 🔧 Refactoring (no functional changes)

Related Issues

Closes #876

Changes Made

• ui/Skeleton.tsx: Removed dead StreamListSkeleton export (unreferenced in any component)
• dashboard/dashboard-view.tsx: Replaced custom SkeletonCard shimmer implementation with the shared Skeleton component. Added import from @/components/ui/Skeleton
• wallet/WalletButton.tsx: Replaced wallet-btn-skeleton CSS class with shared <Skeleton className="w-[140px] h-[2.4rem] rounded-full" />. Added import from @/components/ui/Skeleton

Testing

Test Coverage

• Unit tests added/updated
• Integration tests added/updated
• Manual testing performed

Test Steps

1. Load the dashboard — verify loading skeleton cards use the consistent animate-pulse animation and gray color scheme
2. Load the wallet button while unhydrated — verify the placeholder uses the same skeleton styling
3. Navigate to /incoming — verify skeleton cards are visually consistent with dashboard skeletons

Checklist

• My code follows the project's style guidelines
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published
• I have checked for breaking changes and documented them if applicable

Additional Notes

No breaking changes. The .wallet-btn-skeleton CSS class in globals.css remains as dead CSS (out of scope for this change). The incoming page's LoadingCard already used the shared Skeleton component and required no changes.