feat: add skeleton loading state to CreatorProfileStatRow (#206)

[temisan0x]

Summary

Adds a dedicated skeleton loading state to CreatorProfileStatRow to prevent layout shift during data hydration.

Changes

• src/components/ui/skeleton.tsx — new reusable Skeleton primitive (animate-pulse + bg-white/[0.08])
• src/components/common/CreatorProfileStatRow.tsx — added isLoading and skeletonCount props; skeleton mirrors exact dimensions and classes of CreatorProfileStatItem
• src/components/common/__tests__/CreatorProfileStatRow.test.tsx — new tests covering loaded state, skeleton state, and placeholder card count

Test results

• 3 new tests added — all pass
• 5 failures in KeySupplyBadge.test.tsx are pre-existing (confirmed on main baseline: 7 failed before this PR, now 5)

Validation

pnpm lint  # clean
pnpm test  # 3 new tests pass

Closes #206

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