feat(chat): retail text style — two-plane glyph outlines, authored SpewBox/chat styles

Campaign CH round 4, user-gate items 1+2. Root cause: retail ships a
second (background) glyph atlas per font, dilated 2px on every side,
plus two border-pixel scalars (Font.NumHorizontalBorderPixels/
NumVerticalBorderPixels) that acdream's font reader never read — so
even the pre-existing outline parameter drew almost nothing once
enabled. Landed together (either half alone is a no-op or a
regression):

- UiDatFont carries BorderX/BorderY from the DAT font resource.
- UiRenderContext.DrawStringDat inflates the background blit's source
  and destination rect by that margin and restructures into retail's
  exact two-pass whole-string outline-then-fill model
  (UIElement_Text::DrawSelf), plus the 8-neighbour +-1px fallback for
  fonts with no background atlas. Corrects the stale "property 0xd"
  comment to the real ids, 0x21 (Outline) / 0x22 (OutlineColor).
- LayoutDesc property 0x21/0x22 import (ElementInfo.Outline/
  OutlineColor, LayoutImporter.ReadState, ElementReader.Merge/
  ApplyCanonicalLegacyProjection, DatWidgetFactory.BuildText) so every
  authored-outline element across the DAT set is correct at once.
- SpewBox: RetailFontId corrected from a round-3 heuristic
  (0x40000025) to the actually-authored 0x40000001 (18px bold serif),
  Outline=true set on the controller's UiText. Fill colour stays the
  user-gate-round-1-pinned yellow — font atlases are alpha-only
  (PFID_A8), so there is no baked shading that could explain the
  screenshot's gold as anything other than the outline itself.
- Chat transcript: default fill now seeds from its authored
  ARGB(255,204,204,204) instead of an unrelated color-table slot
  (ChatTranscriptRenderer.BuildLines takes the transcript's own
  DefaultColor as a parameter); the 34-entry LogTextType table is
  untouched, and every existing CH1 conformance test stays green
  unmodified.

Regenerated the committed chat_2100006f.json fixture from the real
installed DAT, confirming end to end (not by missing-field default)
that the transcript carries no outline.

Tests: font-reader border fields + inflation math pinned against the
real DAT font, two-pass draw ordering/tint/inflation via a new
TextRenderer.DebugSpriteSegmentVerts test seam, property 0x21/0x22
import at both the ElementReader.Merge and StateDesc-property layers,
SpewBox font/outline, and the chat default-shade seed with the color
table proven untouched.

Full Release suite: 12,610 passed / 4 skipped / 0 failed
(AcDream.slnx, complete solution).

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

src/AcDream.App/UI/Layout/LayoutImporter.cs

@@ -559,6 +559,27 @@ public static class LayoutImporter
                 float a = c.Alpha == 0 ? 1f : c.Alpha / 255f;
                 info.FontColor = new System.Numerics.Vector4(c.Red / 255f, c.Green / 255f, c.Blue / 255f, a);
             }
+
+            // Outline (0x21): BoolBaseProperty. Retail SetOutline @0x0046a81c / m_bitField &
+            // 0x10. Only update while still at the default (false); derived-wins handled in
+            // ElementReader.Merge — same "only update if still at default" pattern as HJustify.
+            if (!info.Outline
+                && sd.Properties.TryGetValue(0x21u, out var outlineRaw)
+                && outlineRaw is BoolBaseProperty outlineBool)
+            {
+                info.Outline = outlineBool.Value;
+            }
+
+            // OutlineColor (0x22): ColorBaseProperty. Retail m_curOutlineColor, ctor default
+            // RGBAColor_Black. Only read when not already set — same pattern as FontColor.
+            if (info.OutlineColor is null
+                && sd.Properties.TryGetValue(0x22u, out var outlineColorRaw)
+                && outlineColorRaw is ColorBaseProperty outlineColorProp)
+            {
+                var oc = outlineColorProp.Value;
+                float oa = oc.Alpha == 0 ? 1f : oc.Alpha / 255f;
+                info.OutlineColor = new System.Numerics.Vector4(oc.Red / 255f, oc.Green / 255f, oc.Blue / 255f, oa);
+            }
         }
     }