Add responsive card layout for SettlementTable with mobile view and e…

[chuks68]

Closes #146
Add responsive card layout for SettlementTable with mobile view and extend tests for card layout

• Introduce hidden‑on‑large, block‑on‑small card UI that mirrors the table data.
• Preserve existing sortable table behavior and totals.
• Add data-testid="settlement-card" for each card.
• Extend test suite to cover the new mobile layout, ensuring each card renders correct settlement details.
• Update imports to include formatAmount in tests.

[Jagadeeshftw]

Closing — this branch's changes (responsive card layout for SettlementTable) are already present on main via earlier merged PRs (#352, #346, #344). Merging main into this branch produces a zero-diff result, so there's nothing left to merge. Thanks for the contribution!