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/ui/windows/address_transfer_dialog.h

@@ -11,6 +11,7 @@
 #include "../../app.h"
 #include "../../util/i18n.h"
 #include "../material/draw_helpers.h"
+#include "../notifications.h"
 #include "../theme.h"
 #include "imgui.h"
 
@@ -171,11 +172,6 @@ public:
                 ImGui::PopStyleColor();
             }
 
-            ImGui::Spacing();
-            ImGui::Spacing();
-            ImGui::Separator();
-            ImGui::Spacing();
-
             // Buttons
             const char* cancelLabel = TR("cancel");
             const char* confirmLabel = TR("confirm_transfer");
@@ -192,6 +188,20 @@ public:
                 buttonFont->CalcTextSizeA(buttonFontSize, 1000.0f, 0.0f, sendingLabel).x);
             float confirmW = std::max(confirmMinW, confirmTextW + buttonPadW);
             float totalW = cancelW + confirmW + Layout::spacingMd();
+            float footerH = ImGui::GetFrameHeight() + ImGui::GetStyle().ItemSpacing.y * 3.0f + 1.0f;
+            ImGuiViewport* vp = ImGui::GetMainViewport();
+            float cardBottomY = vp->Pos.y + vp->Size.y * 0.85f;
+            float footerTopY = cardBottomY - 24.0f * dp - footerH;
+            float currentY = ImGui::GetCursorScreenPos().y;
+            if (currentY < footerTopY) {
+                ImGui::Dummy(ImVec2(0, footerTopY - currentY));
+            } else {
+                ImGui::Spacing();
+            }
+
+            ImGui::Separator();
+            ImGui::Spacing();
+
             float rowStartX = ImGui::GetCursorPosX();
             float contentW = ImGui::GetContentRegionAvail().x;
             ImGui::SetCursorPosX(rowStartX + std::max(0.0f, (contentW - totalW) * 0.5f));
@@ -209,11 +219,14 @@ public:
                     [](bool ok, const std::string& result) {
                         s_sending = false;
                         s_success = ok;
-                        if (ok)
-                            s_resultMsg = result; // opid
-                        else
-                            s_resultMsg = result; // error message
+                        s_resultMsg = result;
+                        if (ok) {
+                            Notifications::instance().success(TR("transfer_sent_desc"));
+                        } else {
+                            Notifications::instance().error(result.empty() ? TR("transfer_failed") : result);
+                        }
                     });
+                s_open = false;
             }
             ImGui::EndDisabled();