fix(chargen): Campaign CC gate round 1 closeout — Group 3: round review fixes (F4-F11, F14, F16)

The remaining code-bearing findings from the round review, F4-F16 minus
the doc-only items (batched separately):

- F4: three client-wide UiButton corpus sweeps (LabelBox path — exactly
  the 4 Town buttons, confined to chargen; conflicting custom-selection-
  pair + standard Normal/Highlight media — zero found, no gate
  tightening needed; per-state label-color map — 209 matches beyond
  chargen, confirming AP-222's mechanism has always been broadly active
  since it shipped generically in DatWidgetFactory).
- F5/F6: LayoutImporter's Batch C un-consumed-children carve-out now
  honors a child's own AuthoredInvisible flag (a narrow honor scoped to
  exactly that carve-out, not the general #408 client-wide one) — the
  chat transcript's new-text indicator (0x1000048C) was building as a
  visible phantom element retail never shows; verified both directions
  against the gold-frame pieces, which do not author Invisible.
- F7: BoundedProcessOutputCapture.AppendLine combines the line text and
  its trailing newline into one buffer and one file open/write/close
  instead of two.
- F9: corrected a stale comment in RuntimeSettingsTargets — #407 split
  DisplayModeCatalog's Resolutions/WindowedResolutions in two, so the
  fullscreen validator's own narrower list is now DELIBERATELY different
  from the Config dropdown's fuller offering, not the "must match" bug
  the comment described.
- F10: documented (not changed) why the LabelBox path's default 3px
  inset and the face-relative +4px gap in DatWidgetFactory.BuildButton
  are deliberately different numbers — neither carries a retail
  citation, and moving either to match the other would be an unfounded
  guess on a button that currently works correctly.
- F11: Heritage/Profession/Summary/Town description pages now compose
  DatRichText.Compose's result ONCE inside their already revision-gated
  Refresh, caching the built line list instead of re-wrapping on every
  draw call.
- F14: documented (not changed) why PrivateEntityViewportRenderer's
  _animatedIds set carrying a reserved-but-never-drawn backdrop id is
  harmless — BuildDrawEntities already excludes a null/empty backdrop
  from the actual draw list, so the id is never looked up.
- F16: the Summary preview now uses its own render-id pair
  (SummaryPreviewRenderId/SummaryPreviewBackdropRenderId, 0xDA11D035/
  0xDA11D036) instead of sharing the Appearance page's
  (0xDA11D032/0xDA11D034) — confirmed by tracing
  FixedEntityTextureOwnerLease through TextureCache to
  CompositeTextureArrayCache's shared owner tracker that both pages'
  previews share ONE process-wide TextureCache, so sharing render ids
  was a real cross-page texture-release collision (either page's own
  re-dress or disposal could release the OTHER page's still-active
  textures), not a theoretical one.

F3's own register bookkeeping (AP-229 addendum) and F12's register/AD
header-count corrections land in the docs-only commit alongside F15.

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

src/AcDream.App/Rendering/ChargenPreviewController.cs

@@ -180,6 +180,8 @@ internal sealed class ChargenPreviewController :
     private readonly IChargenClothingTableSource _clothingTables;
     private readonly object _datLock;
     private readonly bool _useZoomedOutEye;
+    private readonly uint _renderId;
+    private readonly uint _backdropRenderId;
     private readonly Stopwatch _clock = Stopwatch.StartNew();
 
     private ChargenPreviewAnimator? _animator;
@@ -228,7 +230,19 @@ internal sealed class ChargenPreviewController :
         IChargenPalSetSource palSets,
         IChargenClothingTableSource clothingTables,
         object datLock,
-        bool useZoomedOutEye = false)
+        bool useZoomedOutEye = false,
+        // F16 (Campaign CC gate round 1 closeout): the render-id pair this
+        // controller stamps on the entities it builds — MUST match the
+        // pair the sibling ChargenPreviewRenderer was constructed with (see
+        // that class's own renderId/backdropRenderId parameters), since
+        // both feed the SAME shared TextureCache owner-tracking key.
+        // Defaults to the Appearance page's pair; the composition root
+        // passes the Summary pair explicitly for its own instance — see
+        // ChargenPreviewEntityBuilder.SummaryPreviewRenderId's own doc for
+        // why sharing the default here would be a real collision, not
+        // merely untidy.
+        uint renderId = ChargenPreviewEntityBuilder.PreviewRenderId,
+        uint backdropRenderId = ChargenPreviewEntityBuilder.PreviewBackdropRenderId)
     {
         _renderer = renderer ?? throw new ArgumentNullException(nameof(renderer));
         _camera = camera ?? throw new ArgumentNullException(nameof(camera));
@@ -239,6 +253,8 @@ internal sealed class ChargenPreviewController :
         _clothingTables = clothingTables ?? throw new ArgumentNullException(nameof(clothingTables));
         _datLock = datLock ?? throw new ArgumentNullException(nameof(datLock));
         _useZoomedOutEye = useZoomedOutEye;
+        _renderId = renderId;
+        _backdropRenderId = backdropRenderId;
         _rotation = new ChargenPreviewRotationController();
         // Seed the eye NOW, matching whatever the first Rebuild's own
         // heritageOrGenderChanged branch below would otherwise defer until
@@ -298,7 +314,7 @@ internal sealed class ChargenPreviewController :
         Quaternion heading = MoveToMath.SetHeading(
             Quaternion.Identity, _rotation.HeadingDegrees);
         ChargenPreviewAnimatedBuild? build = ChargenPreviewEntityBuilder.TryBuildAnimated(
-            _dats, _animations, result, heritageId, heading, _datLock);
+            _dats, _animations, result, heritageId, heading, _datLock, _renderId);
         if (build is null)
             return false;
 
@@ -335,7 +351,7 @@ internal sealed class ChargenPreviewController :
             WorldEntity? backdrop =
                 options.TryGetHeritage(heritageId, out ChargenHeritageOptions? heritage)
                     ? ChargenPreviewEntityBuilder.TryBuildBackdrop(
-                        _dats, heritage!.EnvironmentSetupId, _datLock)
+                        _dats, heritage!.EnvironmentSetupId, _datLock, _backdropRenderId)
                     : null;
             _renderer.SetBackdrop(backdrop);
         }