User folders: save games and Settings.cfg in Documents\Sacred

The game's ANSI file API calls are hooked; paths under save\ and
Settings.cfg are redirected to Documents\Sacred\save and
Documents\Sacred\config, copied there once from the game folder.
The shared chest uses the same save folder.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

src/mods/sharedchest.cpp

@@ -12,7 +12,7 @@
 // serializer (vf1c(stream, 1, 0)); loadHero recreates them with
 // cObjectManager::Create(type, 0, 0, 0), vf1c(stream, 0, file version) and
 // gives them their new id. The shared chest does the same into
-// save\shared_chest.json: written whenever a hero is saved, read at the start
+// shared_chest.json in the save folder (mods/userfolders.cpp): written whenever a hero is saved, read at the start
 // of each game session; cleared when the session ends (the ids die with the
 // object manager).
 
@@ -38,7 +38,7 @@
 #include "mods/itemstack.h"
 #include "mods/sharedchest.h"
 #include "mods/skillslots.h"
-#include "re/config.h"
+#include "mods/userfolders.h"
 #include "re/hook.h"
 #include "re/log.h"
 
@@ -102,11 +102,7 @@ bool SharedOpen() {
 }
 
 std::string FilePath() {
-    std::string dir = re::ConfigString("paths", "GameDir", "");
-    if (!dir.empty() && dir.back() != '\\' && dir.back() != '/') {
-        dir += '\\';
-    }
-    return dir + "save\\shared_chest.json";
+    return mods::userfolders::SaveDir() + "shared_chest.json";
 }
 
 // --- items <-> JSON ------------------------------------------------------------