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/main.cpp

@@ -1224,6 +1224,8 @@ int main(int argc, char* argv[])
 
                 // Immediate triggers: async RPC results or visible notifications
                 bool hasImmediateWork = app.hasPendingRPCResults()
+                                     || app.hasTransactionSendProgress()
+                                     || app.isTransactionRefreshInProgress()
                                      || dragonx::ui::Notifications::instance().hasActive();
 
                 // Periodic maintenance: fire refresh timers in app.update()
@@ -1801,6 +1803,8 @@ int main(int argc, char* argv[])
                                       && !opaqueBackground;
             bool animating = app.isShuttingDown()
                           || backdropNeedsFrames
+                          || app.hasTransactionSendProgress()
+                          || app.isTransactionRefreshInProgress()
                           || dragonx::ui::effects::ThemeEffects::instance().hasActiveAnimation()
                           || dragonx::ui::Notifications::instance().hasActive()
                           || dragonx::ui::material::SmoothScrollAnimating();