feat: blockchain rescan via daemon restart + status bar progress

- Fix z_importwallet to use full path instead of filename only
- Add rescanBlockchain() method that restarts daemon with -rescan flag
- Track rescan progress via daemon output parsing and getrescaninfo RPC
- Display rescan progress in status bar with animated indicator when starting
- Improve dark theme card contrast: lighter surface-variant, tinted borders, stronger rim-light

src/ui/windows/key_export_dialog.cpp

@@ -7,8 +7,6 @@
 #include "../../rpc/rpc_client.h"
 #include "../../rpc/rpc_worker.h"
 #include "../../util/i18n.h"
-#include "../theme.h"
-#include "../effects/imgui_acrylic.h"
 #include "../schema/ui_schema.h"
 #include "../material/draw_helpers.h"
 #include "imgui.h"
@@ -58,15 +56,7 @@ void KeyExportDialog::render(App* app)
     auto copyBtn = S.button("dialogs.key-export", "copy-button");
     auto closeBtn = S.button("dialogs.key-export", "close-button");
 
-    ImGui::SetNextWindowSize(ImVec2(win.width, win.height), ImGuiCond_FirstUseEver);
-    ImGui::OpenPopup(title);
-    
-    ImVec2 center = ImGui::GetMainViewport()->GetCenter();
-    ImGui::SetNextWindowPos(center, ImGuiCond_Appearing, ImVec2(0.5f, 0.5f));
-
-    const auto& acrylicTheme = GetCurrentAcrylicTheme();
-    if (effects::ImGuiAcrylic::BeginAcrylicPopupModal(title, &s_open, 
-            ImGuiWindowFlags_NoResize, acrylicTheme.popup)) {
+    if (material::BeginOverlayDialog(title, &s_open, win.width, 0.94f)) {
         ImGui::Spacing();
 
         // Warning section with colored background
@@ -239,7 +229,7 @@ void KeyExportDialog::render(App* app)
             s_show_key = false;
         }
 
-        effects::ImGuiAcrylic::EndAcrylicPopup();
+        material::EndOverlayDialog();
     }
 }