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/UiField.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Numerics;
 
@@ -11,16 +11,16 @@ namespace AcDream.App.UI;
 /// as stubs for future item-window use.
 ///
 /// <para>
-/// Caret is a glyph index; the caret pixel-X is Σ glyph advances (UiDatFont) to the
+/// Caret is a glyph index; the caret pixel-X is Σ glyph advances (UiDatFont) to the
 /// caret. Supports mouse + Shift-arrow SELECTION, clipboard cut/copy/paste, and
 /// held-key auto-repeat (hold Backspace deletes continuously). Submit (Enter / Send)
 /// fires <see cref="OnSubmit"/>, clears, and pushes history (100-entry cap,
-/// sentinel 0xFFFFFFFF — port of <c>ChatInterface::ProcessCommand @0x4f5100</c>).
+/// sentinel 0xFFFFFFFF — port of <c>ChatInterface::ProcessCommand @0x4f5100</c>).
 /// </para>
 ///
 /// Decomp: UIElement_Text MoveCursor @0x468d00, FindPixelsFromPos @0x472b40.
 /// </summary>
-internal sealed class UiField : UiElement
+public sealed class UiField : UiElement
 {
     private readonly record struct WrappedLine(int Start, int Length, string Text);
 
@@ -71,9 +71,9 @@ internal sealed class UiField : UiElement
     /// Wired by the host from <see cref="UiHost.Keyboard"/>.</summary>
     public Silk.NET.Input.IKeyboard? Keyboard { get; set; }
 
-    /// <summary>Dat sprite resolver (id → GL texture + size) for the focused-field
+    /// <summary>Dat sprite resolver (id → GL texture + size) for the focused-field
     /// background. Null = fall back to the flat <see cref="BackgroundColor"/> rect.</summary>
-    public Func<uint, (GpuTextureSlot tex, int w, int h)>? SpriteResolve { get; set; }
+    public Func<uint, (uint tex, int w, int h)>? SpriteResolve { get; set; }
     /// <summary>Unfocused/default state sprite imported from the DAT.</summary>
     public uint BackgroundSprite { get; set; }
     /// <summary>Gold "lit" field background drawn when focused (retail Normal_focussed
@@ -120,7 +120,7 @@ internal sealed class UiField : UiElement
     /// are reproduced procedurally, so the importer must not build them as widgets.</summary>
     public override bool ConsumesDatChildren => true;
 
-    // ── Editing primitives ──────────────────────────────────────────────
+    // ── Editing primitives ──────────────────────────────────────────────
 
     public void InsertChar(char c)
     {
@@ -169,7 +169,7 @@ internal sealed class UiField : UiElement
 
     private void MoveCaret(int delta, bool shift) => MoveCaretTo(_caret + delta, shift);
 
-    // ── Selection ────────────────────────────────────────────────────────
+    // ── Selection ────────────────────────────────────────────────────────
 
     private (int lo, int hi) SelSpan()
     {
@@ -268,7 +268,7 @@ internal sealed class UiField : UiElement
         _historyIndex = -1;
     }
 
-    // ── Submit + history ─────────────────────────────────────────────────
+    // ── Submit + history ─────────────────────────────────────────────────
 
     public void Submit()
     {
@@ -315,9 +315,9 @@ internal sealed class UiField : UiElement
         _selAnchor = null;
     }
 
-    // ── Geometry ─────────────────────────────────────────────────────────
+    // ── Geometry ─────────────────────────────────────────────────────────
 
-    /// <summary>Pixel-X of the caret (Σ glyph advances to <paramref name="i"/>).</summary>
+    /// <summary>Pixel-X of the caret (Σ glyph advances to <paramref name="i"/>).</summary>
     private float MeasureTo(int i)
     {
         if (i <= 0) return 0f;
@@ -328,7 +328,7 @@ internal sealed class UiField : UiElement
 
     public float CaretPixelX() => MeasureTo(_caret);
 
-    /// <summary>Map a local X (click) to the nearest caret index — retail
+    /// <summary>Map a local X (click) to the nearest caret index — retail
     /// FindPixelsFromPos inverse. Accounts for the horizontal scroll offset.</summary>
     private int HitCharX(float localX)
     {
@@ -344,25 +344,25 @@ internal sealed class UiField : UiElement
         return best;
     }
 
-    // ── Draw ─────────────────────────────────────────────────────────────
+    // ── Draw ─────────────────────────────────────────────────────────────
 
     protected override void OnDraw(UiRenderContext ctx)
     {
         // Focused = "write mode": draw the gold lit field sprite (retail Normal_focussed).
         // Unfocused: draw the imported default state, then the flat translucent fallback.
         // Both go through the sprite bucket
-        // (DrawFill / DrawSprite) so the text — also sprite-bucket — draws on top.
+        // (DrawFill / DrawSprite) so the text — also sprite-bucket — draws on top.
         bool lit = _focused && SpriteResolve is not null && FocusFieldSprite != 0;
         if (lit)
         {
             var (tex, tw, th) = SpriteResolve!(FocusFieldSprite);
-            if (tex.IsAssigned && tw > 0) ctx.DrawSprite(tex, 0, 0, Width, Height, 0f, 0f, 1f, 1f, Vector4.One);
+            if (tex != 0 && tw > 0) ctx.DrawSprite(tex, 0, 0, Width, Height, 0f, 0f, 1f, 1f, Vector4.One);
             else lit = false;
         }
         if (!lit && SpriteResolve is not null && BackgroundSprite != 0)
         {
             var (tex, tw, th) = SpriteResolve(BackgroundSprite);
-            if (tex.IsAssigned && tw > 0 && th > 0)
+            if (tex != 0 && tw > 0 && th > 0)
             {
                 ctx.DrawSprite(tex, 0, 0, Width, Height, 0f, 0f,
                     Width / tw, Height / th, Vector4.One);
@@ -382,7 +382,7 @@ internal sealed class UiField : UiElement
         float visibleW = MathF.Max(1f, Width - 2f * Padding);
 
         // Horizontal scroll: keep the caret inside the field; clamp so we never scroll past
-        // the text. Then draw only the glyph window that lands inside the field — a single-
+        // the text. Then draw only the glyph window that lands inside the field — a single-
         // line text box clips + scrolls (retail UIElement_Text) rather than overflowing the
         // field (which previously spilled the text out into the 3D world).
         float caretX = MeasureTo(_caret);
@@ -417,7 +417,7 @@ internal sealed class UiField : UiElement
 
         if (_focused)
         {
-            // Caret on TOP of the text → submitted after the text in the same bucket.
+            // Caret on TOP of the text → submitted after the text in the same bucket.
             float cx = Padding + alignX + (caretX - _scrollX);
             if (cx >= Padding - 1f && cx <= Width - Padding + 1f)
                 ctx.DrawFill(cx, ty, 1f, lh, TextColor);
@@ -620,7 +620,7 @@ internal sealed class UiField : UiElement
         return line.Start + best;
     }
 
-    // ── Auto-repeat ──────────────────────────────────────────────────────
+    // ── Auto-repeat ──────────────────────────────────────────────────────
 
     protected override void OnTick(double deltaSeconds)
     {
@@ -649,7 +649,7 @@ internal sealed class UiField : UiElement
         && (Keyboard.IsKeyPressed(Silk.NET.Input.Key.ShiftLeft)
             || Keyboard.IsKeyPressed(Silk.NET.Input.Key.ShiftRight));
 
-    // ── Events ───────────────────────────────────────────────────────────
+    // ── Events ───────────────────────────────────────────────────────────
 
     public override bool OnEvent(in UiEvent e)
     {