[Client] Sync conflict dialog, onboarding and conflict default

cockatrice/src/interface/deck_sync/deck_sync_conflict.h

@@ -0,0 +1,50 @@
+/**
+ * @file deck_sync_conflict.h
+ * @brief Conflict payload between the sync engine and the conflict dialog.
+ */
+
+#ifndef DECK_SYNC_CONFLICT_H
+#define DECK_SYNC_CONFLICT_H
+
+#include <QString>
+
+/** @brief How a both-sides-changed deck is resolved. */
+enum DeckSyncResolutionAction
+{
+    DeckSyncKeepMine,     ///< Upload the local deck, discarding the server version.
+    DeckSyncKeepServer,   ///< Download the server deck, discarding local changes.
+    DeckSyncKeepBoth,     ///< Keep the local deck and store the server version aside.
+    DeckSyncUseMerge,     ///< Upload the auto-merged deck (only when mergeable).
+    DeckSyncSkipConflict, ///< Leave both sides untouched for this run.
+};
+
+/** @brief Sync direction for one run. */
+enum class DeckSyncMode
+{
+    TwoWay,       ///< Mirror both sides (default).
+    UploadOnly,   ///< Push local content; never download or propagate deletes.
+    DownloadOnly, ///< Take server content; never upload or push deletes.
+    Separate,     ///< First-sync verdict only: keep this profile out of sync.
+};
+
+/** @brief One deck that changed both locally and on the server. */
+struct DeckSyncConflict
+{
+    QString relativePath;      ///< Local deck path relative to the deck folder.
+    QString localAbsolutePath; ///< Absolute local file path.
+    QString serverDeckString;  ///< Server deck content in native format.
+    QString baseDeckString;    ///< Last-synced content, empty when no snapshot exists.
+    bool hasBase = false;      ///< False when the base snapshot is missing.
+    qint64 localSecs = 0;      ///< Local modification time, seconds since epoch.
+    qint64 serverSecs = 0;     ///< Server modification time, seconds since epoch.
+};
+
+/** @brief The dialog verdict for one DeckSyncConflict. */
+struct DeckSyncResolution
+{
+    DeckSyncResolutionAction action = DeckSyncKeepMine;
+    bool rememberSession = false; ///< Reuse this verdict for later conflicts this run.
+    bool rememberAlways = false;  ///< Store this verdict as the conflict default setting.
+};
+
+#endif // DECK_SYNC_CONFLICT_H