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Area: useContractMutation.ts, transaction flows

Transactions only show pending → success/error. Missing intermediate states: submitted (in mempool), confirming (awaiting ledger close), confirmed (N confirmations). If the UI loses track mid-flight, users see a frozen spinner forever.

Fix:

• Add transaction states: idle | pending | submitted | confirming | confirmed | failed
• Poll pollTransaction(txHash) and update UI at each stage
• Show estimated wait time ("Waiting for ledger close...")
• Add a "Transaction stuck?" recovery link after 60s