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/Layout/ToolbarControllerTests.cs

@@ -149,7 +149,12 @@ public class ToolbarControllerTests
         repo.AddOrUpdate(new ClientObject { ObjectId = player, Type = ItemType.Creature });
         repo.AddOrUpdate(new ClientObject { ObjectId = pack, Type = ItemType.Container, ItemsCapacity = 24 });
         repo.MoveItem(pack, player, 0);
-        repo.AddOrUpdate(new ClientObject { ObjectId = kit, Type = ItemType.Misc, Useability = 0x000A0008u });
+        repo.AddOrUpdate(new ClientObject
+        {
+            ObjectId = kit, Type = ItemType.Misc,
+            Useability = 0x00220008u,               // USEABLE_SOURCE_CONTAINED_TARGET_REMOTE_OR_SELF
+            TargetType = (uint)ItemType.Creature,   // retail kind gate
+        });
         repo.MoveItem(kit, pack, 0);
         var useWithTarget = new List<(uint Source, uint Target)>();
         var interaction = new ItemInteractionController(