[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.cpp

@@ -565,7 +565,7 @@ void TabDeckStorage::onSyncStatusMessage(const QString &message)
     renderSyncStatus();
 }
 
-void TabDeckStorage::onSyncFinished(int uploaded, int downloaded, int unchanged, int skipped, const QString &error)
+void TabDeckStorage::onSyncFinished(const SyncSummary &summary, const QString &error)
 {
     aSyncNow->setEnabled(remoteEnabled);
     if (!error.isEmpty()) {
@@ -574,7 +574,7 @@ void TabDeckStorage::onSyncFinished(int uploaded, int downloaded, int unchanged,
     } else {
         syncStatusType = SyncStatusType::Finished;
         syncStatusDetail.clear();
-        lastSyncSummary = {uploaded, downloaded, unchanged, skipped};
+        lastSyncSummary = summary;
     }
     renderSyncStatus();
     if (error.isEmpty()) {