Hides the terminator tracker from stripping UI (#4008)

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## Short description
fixes somthing thats probaly an oversight from the orginal terminator
addition

## Why we need to add this
makes it nigh impossible to metagame terminators

## Media (Video/Screenshots)
<img width="233" height="514" alt="image"
src="https://github.com/user-attachments/assets/9611e861-876f-4135-88f6-a9e0b97047d7"
/>

## Checks
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- [x] I do not require assistance to complete the PR.
- [x] Before posting/requesting review of a PR, I have verified that the
changes work.
- [x] I have added screenshots/videos of the changes, or this PR does
not change in-game mechanics.
- [x] I affirm that my changes are licensed under the [MIT
License](https://github.com/ss14Starlight/space-station-14/blob/Starlight/LICENSE.TXT)
and grant permission for use in this repository under its conditions.

**Changelog**

:cl: Scarlet lightweaver
- tweak: Changed the terminators tracking beacon to be entirely hidden
from others in the stripping UI.

Author: ScarletLightweaverSS14

Content.Client/Inventory/StrippableBoundUserInterface.cs

@@ -231,6 +231,11 @@ private void AddInventoryButton(EntityUid invUid, string slotId, InventoryCompon
             if (!_inv.TryGetSlotContainer(invUid, slotId, out var container, out var slotDef, inv))
                 return;
 
+            // Starlight start
+            if (slotDef.HideFromStrip && _player.LocalEntity != invUid)
+                return;
+            // Starlight end
+
             var entity = container.ContainedEntity;
 
             // If this is a full pocket, obscure the real entity

Content.Shared/Inventory/InventoryTemplatePrototype.cs

@@ -46,6 +46,13 @@ public sealed partial class SlotDefinition
     /// </summary>
     [DataField("stripHidden")] public bool StripHidden { get; private set; }
 
+    // Starlight start
+    /// <summary>
+    ///     Whether or not this slot is completely hidden from the strip menu for other players.
+    /// </summary>
+    [DataField("hideFromStrip")] public bool HideFromStrip { get; private set; }
+    // Starlight end
+
     /// <summary>
     ///     Offset for the clothing sprites.
     /// </summary>

Content.Shared/Strip/SharedStrippableSystem.cs

@@ -257,6 +257,15 @@ private bool CanStripInsertInventory(
             return false;
         }
 
+        // Starlight start: server-side HideFromStrip enforcement
+        if (_inventorySystem.TryGetSlot(target, slot, out var insertSlotDef) &&
+            insertSlotDef.HideFromStrip &&
+            user.Owner != target)
+        {
+            return false;
+        }
+        // Starlight end
+
         var targetIdentity = Identity.Entity(target, EntityManager);
 
         if (_inventorySystem.TryGetSlotEntity(target, slot, out _))
@@ -367,6 +376,15 @@ private bool CanStripRemoveInventory(
         EntityUid item,
         string slot)
     {
+        // Starlight start: server-side HideFromStrip enforcement
+        if (_inventorySystem.TryGetSlot(target, slot, out var removeSlotDef) &&
+            removeSlotDef.HideFromStrip &&
+            user != target)
+        {
+            return false;
+        }
+        // Starlight end
+
         if (!_inventorySystem.TryGetSlotEntity(target, slot, out var slotItem))
         {
             _popupSystem.PopupCursor(Loc.GetString("strippable-component-item-slot-free-message", ("owner", Identity.Entity(target, EntityManager))));

Resources/Prototypes/_Starlight/InventoryTemplates/terminator_inventory_template.yml

@@ -97,6 +97,7 @@
       uiWindowPos: 0,4
       strippingWindowPos: 0,3
       displayName: Pocket 3
+      hideFromStrip: true
     - name: suitstorage
       slotTexture: suit_storage
       slotFlags:   SUITSTORAGE