perf(net): one balance scan per poll, filtered opstatus, a guarded merge scope

The Core poll ran z_gettotalbalance twice (minconf 0 and 1), each a whole-
wallet scan under dragonxd's cs_main. The spendable (minconf=1) call now
runs only after the display call succeeded, and only when something is
unconfirmed or pending or the exact total moved: about 95% of polls make
one scan instead of two. A forced post-send balance can no longer be lost
to a refused enqueue, and pending-send debits aren't re-applied each tick.

z_getoperationstatus is filtered to our opids with its real argument form
([[id,...]]; the old ["id"] was rejected), falling back to the unfiltered
call if a daemon refuses the filter. The Shield/Merge dialog's own polls
are filtered and session-guarded too, and finally reach Done; the dead
RPCClient wrappers are deleted.

The Merge/Consolidate scope scan becomes a tested state machine: one scan
at a time, failures latch behind a Retry button, only "node not ready"
retries by itself (10/30/60 s, at most 3), Lite never scans. Its 120 s
calls are maintenance calls: every main-thread disconnect aborts one in
flight first, so a lifecycle action no longer freezes the UI behind it.
An aborted merge that was already sent says it may still go through.

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

src/rpc/rpc_client.h

@@ -257,10 +257,6 @@ public:
     void z_mergeToAddress(const std::vector<std::string>& fromAddrs, const std::string& toAddr,
                           double fee, int limit, Callback cb, ErrorCallback err = nullptr);
     
-    // Operation status monitoring
-    void z_getOperationStatus(const std::vector<std::string>& opids, Callback cb, ErrorCallback err = nullptr);
-    void z_getOperationResult(const std::vector<std::string>& opids, Callback cb, ErrorCallback err = nullptr);
-    
     // Received transactions
     void z_listReceivedByAddress(const std::string& address, int minconf, Callback cb, ErrorCallback err = nullptr);
 
@@ -272,7 +268,6 @@ public:
                           double fee, int limit, UnifiedCallback cb);
     void z_mergeToAddress(const std::vector<std::string>& fromAddrs, const std::string& toAddr,
                           double fee, int limit, UnifiedCallback cb);
-    void z_getOperationStatus(const std::vector<std::string>& opids, UnifiedCallback cb);
     void getBlock(int height, UnifiedCallback cb);
 
 private: