fix(C-01): review fixes — missing keys, duplicate, GPS shock i18n

- Add missing keephead_enabled/disabled translation keys (BUG-001)
- Remove duplicate gui.tiedup.close key at line 403 (RISK-004)
- Fix GPS shock: use null addon + send GPS_ZONE_VIOLATION separately (RISK-001)

src/main/java/com/tiedup/remake/state/components/PlayerShockCollar.java

@@ -56,7 +56,8 @@ public class PlayerShockCollar {
      * Triggers a visual and auditory shock effect.
      * Damage is applied (shock can kill).
      *
-     * @param messageAddon Optional message addon for HUD (e.g., GPS violation)
+     * @param messageAddon Optional message addon for HUD (e.g., GPS violation).
+     *        For translatable messages, prefer calling shockKidnapped() then sending the message separately.
      * @param damage Shock damage amount
      */
     public void shockKidnapped(@Nullable String messageAddon, float damage) {
@@ -100,7 +101,7 @@ public class PlayerShockCollar {
 
         // HUD Message via SystemMessageManager
         if (messageAddon != null) {
-            // Custom message with addon (e.g., GPS violation)
+            // Legacy addon path: append literal text to SLAVE_SHOCK message
             MutableComponent msg = Component.translatable(
                 SystemMessageManager.getTranslationKey(MessageCategory.SLAVE_SHOCK)
             ).append(Component.literal(messageAddon));
@@ -197,9 +198,11 @@ public class PlayerShockCollar {
 
         if (shouldShockGPS && gpsStackCopy != null) {
             this.shockKidnapped(
-                " Return back to your allowed area!",
+                null,
                 GameConstants.DEFAULT_SHOCK_DAMAGE
             );
+            // GPS-specific message (replaces hardcoded " Return back to your allowed area!")
+            SystemMessageManager.sendToPlayer(host.getPlayer(), MessageCategory.GPS_ZONE_VIOLATION);
             warnOwnersGPSViolation(gpsStackCopy);
         }
     }

src/main/resources/assets/tiedup/lang/en_us.json

@@ -282,6 +282,8 @@
   "command.tiedup.clothes.unknown_layer": "Unknown layer: %s",
   "command.tiedup.clothes.layer_visible": "Wearer's %s layer is now visible",
   "command.tiedup.clothes.layer_hidden": "Wearer's %s layer is now hidden",
+  "command.tiedup.clothes.keephead_enabled": "Keep head mode enabled",
+  "command.tiedup.clothes.keephead_disabled": "Keep head mode disabled",
 
   "gui.tiedup.command_wand.title": "Command Wand",
   "gui.tiedup.command_wand.personality": "Personality",
@@ -400,7 +402,6 @@
 
   "gui.tiedup.slave_trader": "Slave Trader",
   "gui.tiedup.buy": "Buy",
-  "gui.tiedup.close": "Close",
   "gui.tiedup.no_captives_available": "No captives available for sale",
 
   "gui.tiedup.cell_manager": "Cell Manager",