fix(ui): include transactionrecord.h in overviewpage.cpp

The 3-tier amount color rule references TransactionStatus::Confirming
directly. transactiontablemodel.h only forward-declares TransactionStatus
(it does not include transactionrecord.h), so the inner enum value
'Confirming' was not visible in the overviewpage.cpp translation unit.

This manifested as a build failure on every Qt build (linux-qt, macos,
windows-qt) on the rebased PR #22. Daemon builds were unaffected because
they don't compile overviewpage.cpp.

Fix: include transactionrecord.h in overviewpage.cpp so the
TransactionStatus enum values are in scope.

src/qt/overviewpage.cpp

@@ -5,6 +5,7 @@
 #include "trianglesunits.h"
 #include "optionsmodel.h"
 #include "transactiontablemodel.h"
+#include "transactionrecord.h"
 #include "transactionfilterproxy.h"
 #include "guiutil.h"
 #include "guiconstants.h"