fix(wallet): retire tracked sends that only paid the wallet itself

A send stays tracked until z_viewtransaction shows an outgoing output.
Shields, merges/consolidations and chat note splits pay only the wallet
itself, so they never showed one. They stayed tracked for the whole
session and forced a full history refresh past the scan throttle on
every tab.

- A tracked send whose view has no outgoing output is retired once it
  is mined (1+ confirmations) or conflicted.
- Tracked sends are enriched first, and reaching the per-cycle view cap
  no longer ends the loop, so the cap can't starve them.
- Backstop: a tracked send still unsettled 20 blocks after it was added
  (expired, dropped from the mempool) stops being tracked.
- Tracked sends are cleared on disconnect: they belong to that
  connection's wallet.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/services/network_refresh_service.h

@@ -222,6 +222,10 @@ public:
         std::vector<chat::HushChatTransactionMetadata> hushChatMetadata;
         int blockHeight = -1;
         TransactionViewCache newViewTxEntries;
+        // Tracked sends whose view result is final although it shows no outgoing output: the op only
+        // paid the wallet itself (shield, merge/consolidate, auto-shield, chat note split, a transfer
+        // between own addresses) and is now mined or conflicted. Applying the result stops tracking them.
+        std::unordered_set<std::string> resolvedSendTxids;
         std::size_t nextShieldedScanStartIndex = 0;
         std::size_t shieldedAddressesScanned = 0;
         std::size_t shieldedAddressCount = 0;