fix(D.2b): Slice 2 visual gate — frame the whole doll + caption the Slots toggle

Visual gate 1 (user): the doll rendered but only the legs showed (camera
aimed at the model origin = the feet) and the Slots button was invisible.

- DollCamera: aim the look-at at mid-body (~0.95 m) and stand back ~3.7 m
  so the whole ~1.9 m figure fits. (Size is a later retail-comparison
  polish per the user.)
- PaperdollController: the Slots button (0x100005BE) is found + wired
  (diagnostic confirmed armorSlots=9/9, viewport=UiViewport,
  slotsButton=UiButton) but its dat element has no face sprite, so it drew
  nothing. Give it a gold "Slots" caption (UiButton.Label, like chat Send)
  via a new datFont param on Bind. Temporary [Slice2-paperdoll] diagnostic
  logs the button rect + the found widgets (stripped at wrap-up).

Idle animation deferred to a focused follow-up (faithful idle needs a full
AnimatedEntity + Sequencer through the TickAnimations multi-branch path +
re-dress coordination — real integration risk vs the verified static doll).

Build + full App suite green (594).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

tests/AcDream.App.Tests/Rendering/DollCameraTests.cs

@@ -7,14 +7,16 @@ namespace AcDream.App.Tests.Rendering;
 public class DollCameraTests
 {
     [Fact]
-    public void Eye_position_is_the_retail_camera_offset()
+    public void Eye_position_frames_the_doll_from_the_front()
     {
         var cam = new DollCamera { Aspect = 100f / 214f };
         Assert.True(Matrix4x4.Invert(cam.View, out var inv));
         var eye = inv.Translation;
+        // Tuned at the visual gate: aim at mid-body (z≈0.95) and stand back ~3.7 m so the whole
+        // figure fits (model origin is at the feet, so aiming at the origin framed only the legs).
         Assert.Equal(0.12f, eye.X, 3);
-        Assert.Equal(-2.4f, eye.Y, 3);
-        Assert.Equal(0.88f, eye.Z, 3);
+        Assert.Equal(-3.7f, eye.Y, 3);
+        Assert.Equal(0.95f, eye.Z, 3);
     }
 
     [Fact]