List Disputable Transactions

Queries the connected core banking system for recent transactions on a member's account and returns a filtered list of transactions eligible for dispute — ineligible transactions (too old, wrong status, already disputed) are excluded before being returned. Each transaction includes its full transaction type as a rail label and two boolean flags, disputable and dispute_in_progress, to drive checkbox UI state. Casap paginates core results internally until a minimum display threshold is reached or full transaction history is exhausted.