feat(wallet): persist history and surface pending sends

Add an encrypted SQLite transaction history cache with cached tip metadata and
per-address shielded scan progress so startup and full refreshes avoid
re-scanning every z-address while still invalidating on wallet/address/rescan
changes.

Improve wallet history loading by paging transparent transactions, preserving
cached shielded and sent rows, keeping recent/unconfirmed activity visible, and
classifying mining-address receives. Show z_sendmany opid sends immediately in
History and Overview, pin pending rows through refreshes, and apply optimistic
address/balance debits until opids resolve.

Add timestamped RPC console tracing by source/method without logging params or
results, reduce redundant refresh/RPC calls, and cache Explorer recent block
summaries in SQLite.

Expand focused tests for transaction cache encryption, scan-progress
persistence/invalidation, history preservation, operation-status parsing,
pending send visibility, and Explorer/RPC refresh behavior.

src/services/refresh_scheduler.cpp

@@ -16,6 +16,7 @@ RefreshScheduler::Intervals RefreshScheduler::intervalsForPage(ui::NavPage page)
         case NP::Mining:   return {5.0f, 15.0f, 15.0f, 0.0f};
         case NP::Peers:    return {5.0f, 15.0f, 15.0f, 5.0f};
         case NP::Market:   return {5.0f, 15.0f, 15.0f, 0.0f};
+        case NP::Console:  return {10.0f, 30.0f, 30.0f, 0.0f};
         default:           return {5.0f, 15.0f, 15.0f, 0.0f};
     }
 }
@@ -114,14 +115,11 @@ void RefreshScheduler::resetTxAge()
 
 bool RefreshScheduler::shouldRefreshTransactions(int lastTxBlockHeight,
                                                  int currentBlockHeight,
-                                                 bool transactionsEmpty,
                                                  bool transactionsDirty) const
 {
     return lastTxBlockHeight < 0
         || currentBlockHeight != lastTxBlockHeight
-        || transactionsEmpty
-        || transactionsDirty
-        || isDue(Timer::TxAge);
+        || transactionsDirty;
 }
 
 float& RefreshScheduler::timerRef(Timer timer)