docs(test): document and expand coverage for configurable table-skeleton rows (#609)

[apatafamilycompound123-ops]

📌 Description

Completes the acceptance criteria for #609 — "Add a configurable row-count prop to components/ui/table-skeleton.tsx".

TableSkeleton and TransactionTableSkeleton already expose a rows prop (default 6). This PR rounds out that work with clear component documentation and expanded test coverage for the rows prop so the placeholder can match real loaded-content row counts (e.g. a paginated transactions table vs. a short notifications list).

🧩 Changes

• Documentation: added JSDoc + usage examples for the rows (and columns / showHeader) props on TableSkeleton and TransactionTableSkeleton.
• Tests added in components/ui/table-skeleton.test.tsx:
  • Custom larger row count (rows={10}) for both components.
  • Zero body rows when rows={0} for both components.
  • Header row is unaffected by the rows prop.

✅ Acceptance criteria

• rows prop controls rendered skeleton row count.
• Default behavior unchanged for existing call sites that don't pass the prop.
• Test covers a custom row count.

🧪 Verification

npx vitest run components/ui/table-skeleton.test.tsx — 19 tests passing.

🔒 Security notes

N/A — presentational component only.

🔗 Related

Closes #609

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