[DeckSync] Pass the sync summary through the signal and tidy the manager API

- Emit SyncSummary from syncFinished() instead of four positional ints, and
  build it from a single currentSummary() helper, so the counts cannot drift
  between the status message and the signal.
- Use a designated initializer for LocalFile, like the other records.
- Drop setClient() and setColorIdentityProvider(): both fields are already
  constructor parameters and the setters had no callers. setProfile() and
  setDeckPath() stay, since the tab re-reads them before every run.
- Fix the include paths in tab_deck_storage.h and the narrowing conversion of
  the tree item id, so the branch builds again.

cockatrice/src/interface/widgets/tabs/tab_deck_storage.h

@@ -8,8 +8,8 @@
 #ifndef TAB_DECK_STORAGE_H
 #define TAB_DECK_STORAGE_H
 
-#include "../deck_sync/deck_sync_manager.h"
-#include "../interface/widgets/server/remote/remote_decklist_tree_widget.h"
+#include "../../deck_sync/deck_sync_manager.h"
+#include "../server/remote/remote_decklist_tree_widget.h"
 #include "tab.h"
 
 #include <QList>
@@ -129,7 +129,7 @@ private slots:
 
     void actSyncNow();
     void onSyncStatusMessage(const QString &message);
-    void onSyncFinished(int uploaded, int downloaded, int unchanged, int skipped, const QString &error);
+    void onSyncFinished(const SyncSummary &summary, const QString &error);
 
 public:
     TabDeckStorage(TabSupervisor *_tabSupervisor, AbstractClient *_client, const ServerInfo_User *currentUserInfo);