fix(ui): Map tab player/house icon resolution — build the button-swallowed icons from the panel-slot resolve tree, detached from the per-frame layout pass

Two mechanisms, both live-verified (register row AD-108 updated to match):

1. RESOLUTION. The player/house icons (0x100001ED/0x100001EE) are authored
   as nested dat children of m_pMap (0x100001EC), itself a Type-1 button
   whose UiButton.ConsumesDatChildren swallows them at build. The old
   ResolveSwallowedIcon re-imported them standalone via
   ImportInfos(hostLayout, iconId) — which returns null on the live DAT:
   FindDesc walks the raw top-level Elements table (one entry for
   0x2100006E) and never reaches them. Their ElementInfos only materialize
   inside the full panel-slot resolve (ImportInfos(0x2100006E, 0x1000018C))
   that MountMapHousePanel already imports — the pageInfo Bind already
   receives. The fix finds each icon's info under m_pMap's own resolved
   info subtree and BUILDS it through the new Bindings.IconBuilder seam
   (production: LayoutImporter.Build under the DAT lock — the build half
   of RowTemplateResolver's shape). An icon the normal walk DID build is
   preferred (FindDescendant first), so a future ConsumesDatChildren
   policy change cannot double-build.

2. POSITION. Found by this fix's own F1 live verification: the resolved
   ring rendered pinned to m_pMap's top-left. PlaceMarker owns marker
   position outright (retail's gmMapUI::Update re-places every tick;
   retail's UpdateForParentSizeChange runs only on real parent resize),
   but acdream re-runs ApplyAnchor per frame and the icon's compatibility
   anchor had captured the authored (0,0) rect while the panel was still
   hidden, re-asserting it over PlaceMarker's writes every frame.
   PrepareIcon now sets Anchors=None (clearing any imported LayoutPolicy),
   the established runtime-positioned-element convention.

Live numeric gate (session character +Acdream, cell 0xF07E003F):
independent computation (gid_to_lcoord -> display (90.8E, 0.5S) ->
byte-decoded PlaceMarkerOnMap formula, 17x16 icon, marker area
(6,8)-(247,258)) predicts local pixel (226,125); the connected client's
UI-tree dump shows the icon at screen (1166,195) under m_pMap (940,70) =
local (226,125) — exact match in both panel-open dumps. Coordinate text
"0.5S,90.8E", Holtburg town-marker tooltip (real-mouse hover), and the
House tab's "You may buy another house immediately." sentence all
confirmed on screen; ACE-confirmed graceful logout.

New pin: MapHousePanelLiveDatMountTests ([InstalledDatFact]) reproduces
the production mount recipe against the installed DATs — the test that
would have caught this at Batch C: pins the cold-import null, the
panel-slot resolution of both icons with non-degenerate extents, AND
that PlaceMarker's writes survive the per-frame ApplyAnchor pass.

Gates: Release build green; App suite (live-DAT mode) 5479/3 skips
(baseline 5478 + the new pin); Runtime 1744/0; full solution green.

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

src/AcDream.App/UI/RetailUiRuntime.cs

@@ -3329,6 +3329,25 @@ public sealed class RetailUiRuntime : IDisposable
                 return hotspotTemplate.Resolve(templateLayoutId, templateElementId);
         }
 
+        // m_pMap's two button-swallowed icon children (player/house markers)
+        // only exist as ElementInfos INSIDE rootInfo's own panel-slot resolve
+        // tree — a cold ImportInfos(hostLayout, iconId) re-import returns
+        // null on the live DAT (register row AD-108). MapPageController.Bind
+        // locates each icon's info under m_pMap and calls this seam to build
+        // it: the build half of RowTemplateResolver's shape, no import half.
+        // Monitor re-entrancy on DatLock is established for this mount path
+        // (Bind itself runs under the lock below, same as
+        // ResolveHotspotTemplate's own re-entrant take).
+        UiElement? BuildSwallowedIcon(ElementInfo iconInfo)
+        {
+            lock (_bindings.Assets.DatLock)
+                return LayoutImporter.Build(
+                    iconInfo,
+                    _bindings.Assets.ResolveSprite,
+                    _bindings.Assets.DefaultFont,
+                    _bindings.Assets.ResolveFont).Root;
+        }
+
         MapHouseRuntimeBindings mh = _bindings.MapHouse;
         var callbacks = new Layout.MapHousePanelController.Callbacks(
             Toggle: () => ToggleWindow(WindowNames.MapHouse),
@@ -3336,7 +3355,8 @@ public sealed class RetailUiRuntime : IDisposable
                 CurrentCalendar: mh.CurrentCalendar,
                 PlayerCellId: mh.PlayerCellId,
                 HousePosition: mh.HousePosition ?? (static () => null),
-                TemplateResolver: ResolveHotspotTemplate),
+                TemplateResolver: ResolveHotspotTemplate,
+                IconBuilder: BuildSwallowedIcon),
             House: new Layout.HousePageController.Bindings(
                 Lines: mh.HouseLines ?? (static () => Array.Empty<string>()),
                 OnShown: mh.HouseShown,