fix: update local equipment set GUID on save confirmation and auto-request played time on login

SMSG_EQUIPMENT_SET_SAVED now updates the local set's GUID from the
server response, preventing duplicate set creation when clicking
"Update" on a newly-saved set. New sets are also added to the local
list immediately so the UI reflects them without a relog.

Additionally, CMSG_PLAYED_TIME is now auto-sent on initial world entry
(with sendToChat=false) so the character Stats tab shows total and
level time immediately without requiring /played.

include/game/game_handler.hpp

@@ -3479,6 +3479,8 @@ private:
         std::array<uint64_t, 19> itemGuids{};
     };
     std::vector<EquipmentSet> equipmentSets_;
+    std::string pendingSaveSetName_;   // Saved between CMSG_EQUIPMENT_SET_SAVE and SMSG_EQUIPMENT_SET_SAVED
+    std::string pendingSaveSetIcon_;
     std::vector<EquipmentSetInfo> equipmentSetInfo_;  // public-facing copy
 
     // ---- Forced faction reactions (SMSG_SET_FORCED_REACTIONS) ----