Revert "Campaign V slice V4a" - it lost world multisampling

This reverts ceec3bc4. Two independent reasons, either sufficient.

The rendering regression. The slice deleted TextRenderGlStateScope, which
saved GL_MULTISAMPLE and GL_SAMPLE_ALPHA_TO_COVERAGE on entry, disabled them
for the text pass, and restored them on exit (TextRenderGlStateScope.cs:111-112
and 153-154 at the parent commit). Its replacement bakes that state into the
text pipeline but nothing restores it, and GlGpuPassEncoder.Dispose does not
either. Every world renderer is still raw GL at this point in the campaign, so
from the first UI frame onward the world drew with multisampling disabled.

The offline pixel gate caught it: 1,791 of 563,200 compared pixels differed,
0.318% against a 0.001 threshold. The commit message attributed this to
wall-clock-driven ambient animation shifting phase, and committed through the
failure. That explanation does not survive its own control: capturing twice at
the reverted-to commit differs by 19 pixels and twice at the slice's own commit
by 8, while base-versus-head differs by 1,791 - a 224x gap that no shared-noise
source explains. An amplified difference image settles it visually: the changed
pixels are the silhouette edges of every tree, building and rock, with terrain
interiors, water and the entire UI untouched. That is the signature of losing
edge antialiasing, not of animated sprites.

This is the exact failure mode two existing memory notes already warn about -
a mid-frame renderer must set every GL state it uses rather than inherit it,
and issue #52's lesson that a rendering migration must audit per-pass GL state
before declaring itself done.

The scope. The brief was three small leaf renderers plus additive frame-
lifecycle wiring, roughly ten files. The commit changed 334 files with 3,665
insertions and 3,845 deletions, including 323 public-to-internal visibility
conversions across the App assembly, 55 test files, two retired conformance
tests, and a self-described temporary escape hatch for bridging raw-GL viewport
textures. Even without the regression, that is not separable into the part
worth keeping and the part worth dropping.

Reverting rather than patching because the good work here - the RHI frame
lifecycle wiring and a genuine render-state-cache staleness fix - is small
enough to redo cleanly against a tightened spec, while untangling it from 300+
files of unrelated churn is not.

Post-revert: Release build clean, App suite back to 3,843 passed / 3 skipped,
offline pixel gate passing at 19 differing pixels.

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

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

@@ -1,4 +1,4 @@
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.Numerics;
 
 namespace AcDream.App.UI.Layout;
@@ -53,7 +53,7 @@ public sealed class ElementInfo
     /// <summary>
     /// Raw edge-anchor flag values from the dat (<c>LeftEdge</c>, <c>TopEdge</c>,
     /// <c>RightEdge</c>, <c>BottomEdge</c> fields of <c>ElementDesc</c>).
-    /// Values 0–4. Imported elements preserve these in <see cref="UiLayoutPolicy"/>;
+    /// Values 0–4. Imported elements preserve these in <see cref="UiLayoutPolicy"/>;
     /// <see cref="ElementReader.ToAnchors"/> is only the compatibility projection
     /// for older programmatic consumers.
     /// </summary>
@@ -80,7 +80,7 @@ public sealed class ElementInfo
 
     /// <summary>
     /// Font dat object id inherited from the base element's <c>Properties[0x1A]</c>
-    /// (<c>ArrayBaseProperty → DataIdBaseProperty</c>). 0 = none / not inherited.
+    /// (<c>ArrayBaseProperty → DataIdBaseProperty</c>). 0 = none / not inherited.
     /// </summary>
     public uint FontDid;
 
@@ -109,7 +109,7 @@ public sealed class ElementInfo
     public Vector4? FontColor;
 
     /// <summary>
-    /// Sprite per state: state name → (RenderSurface file id, DrawMode int).
+    /// Sprite per state: state name → (RenderSurface file id, DrawMode int).
     /// The <c>""</c> key represents the unnamed DirectState (<c>ElementDesc.StateDesc</c>).
     /// Named states use the <c>UIStateId.ToString()</c> value as the key
     /// (e.g. <c>"HideDetail"</c>, <c>"ShowDetail"</c>).
@@ -220,16 +220,16 @@ public sealed class ElementInfo
 /// No OpenGL, no DatReaderWriter types, no rendering dependencies beyond
 /// the <see cref="AnchorEdges"/> bit-flag enum from <c>AcDream.App.UI</c>.
 /// </summary>
-internal static class ElementReader
+public static class ElementReader
 {
     /// <summary>Compatibility projection from raw retail modes to the legacy
     /// <see cref="AnchorEdges"/> flags. This projection cannot represent centered
     /// mode 3 or proportional mode 4 exactly. Imported DAT widgets therefore use
     /// <see cref="UiLayoutPolicy"/>; call this only for legacy/programmatic paths.</summary>
-    /// <param name="left">LeftEdge dat field value (0–4).</param>
-    /// <param name="top">TopEdge dat field value (0–4).</param>
-    /// <param name="right">RightEdge dat field value (0–4).</param>
-    /// <param name="bottom">BottomEdge dat field value (0–4).</param>
+    /// <param name="left">LeftEdge dat field value (0–4).</param>
+    /// <param name="top">TopEdge dat field value (0–4).</param>
+    /// <param name="right">RightEdge dat field value (0–4).</param>
+    /// <param name="bottom">BottomEdge dat field value (0–4).</param>
     public static AnchorEdges ToAnchors(uint left, uint top, uint right, uint bottom)
     {
         var a = AnchorEdges.None;
@@ -284,7 +284,7 @@ internal static class ElementReader
             X         = derived.X,
             Y         = derived.Y,
             // NOTE: 0 is the "not set, inherit from base" sentinel for Width/Height. This
-            // diverges from the format doc §12 rule 2 ("derived W/H win even if zero") but is
+            // diverges from the format doc §12 rule 2 ("derived W/H win even if zero") but is
             // indistinguishable for Plan 1 (all base elements are zero-size Type-12 prototypes).
             // If a real zero-size derived element ever needs to override a non-zero base in
             // switch Width/Height to nullable values and use presence-aware merging.
@@ -301,11 +301,11 @@ internal static class ElementReader
             // HJustify/VJustify: derived wins when it carries an explicit non-Center value
             // (the dat property was present and read); otherwise inherit the base prototype's value.
             // Center is the default (= "not set by this element") so Center-derived never overrides
-            // a non-Center base — matching the FontDid "non-zero wins" convention.
+            // a non-Center base — matching the FontDid "non-zero wins" convention.
             HJustify         = derived.HJustify != HJustify.Center ? derived.HJustify : base_.HJustify,
             VJustify         = derived.VJustify != VJustify.Center ? derived.VJustify : base_.VJustify,
             // FontColor: derived wins when it has an explicit (non-null) color; otherwise inherit the base.
-            // Null means "dat carried no 0x1B property" — so null-derived does NOT override a non-null base.
+            // Null means "dat carried no 0x1B property" — so null-derived does NOT override a non-null base.
             FontColor        = derived.FontColor ?? base_.FontColor,
             // DefaultStateName: derived wins if set; otherwise inherit the base's default.
             DefaultStateName = !string.IsNullOrEmpty(derived.DefaultStateName) ? derived.DefaultStateName : base_.DefaultStateName,