fix(ui): retail-faithful use-target compat gate + paperdoll doll self-target

Visual gate on the item-interaction slice found two target-use bugs:
the valid-target bullseye showed over inventory ITEMS (a coat is not a
valid healing-kit target) while the paperdoll doll showed blocked (it
should mean SELF).

- TargetCompatible is now a faithful port of
  ItemHolder::IsTargetCompatibleWithTargetingObject (0x00588070):
  a location constraint applies only when the least-limited target-use
  bit (ItemUses::GetLeastLimitedTargetUse 0x004fcd50, new
  ItemUseability.LeastLimitedTargetUse) is Contained/Wielded; the
  player as target requires the Self bit (IsUseable_SelfTarget
  0x004fcd30); and EVERY target passes retail's kind gate
  source._targetType & target->InqType(). The previous hand-rolled
  arms (Remote => accept anything, invented Viewed/Contained accepts,
  self path skipping the kind gate) were the yellow-over-items bug.
  Retail's tradeState refusal is skipped (no trade state yet).
- The paperdoll doll viewport now carries UseTargetGuidProvider =
  player and Clicked -> AcquireSelfTarget (UiViewport gains an opt-in
  Clicked handler), so hovering the doll resolves the self cursor and
  clicking it applies the armed kit to yourself.
- AcquireTarget logs one [use-target] line (wire useability, TargetType
  mask, target kind, decision) so live refusals are diagnosable from
  the launch log.
- Test fixtures updated from the guessed kit useability 0x000A0008 to
  the real USEABLE_SOURCE_CONTAINED_TARGET_REMOTE_OR_SELF (0x00220008,
  ACE Usable.SourceContainedTargetRemoteOrSelf) + TargetType masks;
  new coverage pins the kind gate, the Self-bit requirement, the
  missing-mask-matches-nothing shape, and the Contained location rule.

Full suite green (3,294).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tests/AcDream.App.Tests/UI/RetailUiInteractionFlowTests.cs

@@ -13,7 +13,8 @@ public sealed class RetailUiInteractionFlowTests
     private const uint HealthKit = 0x50001002u;
     private const uint SlotsButtonId = 0x100005BEu;
     private const uint ChestArmorSlotId = 0x100005ACu;
-    private const uint HealthKitUseability = 0x000A0008u;
+    // USEABLE_SOURCE_CONTAINED_TARGET_REMOTE_OR_SELF — the classic healing-kit value.
+    private const uint HealthKitUseability = 0x00220008u;
 
     private const EquipMask HauberkMask =
         EquipMask.ChestArmor
@@ -194,6 +195,7 @@ public sealed class RetailUiInteractionFlowTests
                 Type = ItemType.Misc,
                 IconId = 0x06001235u,
                 Useability = HealthKitUseability,
+                TargetType = (uint)ItemType.Creature,   // retail kind gate
             });
             Objects.MoveItem(HealthKit, Player, slot);
         }