fix(chat): CH6a/b rework — grip media, retail window-id model, floaty fixture

Applies docs/research/2026-08-10-ch6ab-review-findings.md in full:

- BLOCKER 1: UiResizeGrip now carries its ElementInfo/resolve pair and
  draws its own authored DirectState media (a synthetic parameterless
  grip still draws nothing, preserving existing resize-drag tests).
  DatWidgetFactory.BuildResizeGrip threads resolve through. All seven
  live grips on the main chat window now resolve a non-zero sprite,
  restoring the visible borders/corners CH6a silently dropped.

- SHOULD-FIX 2: ChatWindowState gains BroadcastTargetWindow, a sentinel
  distinct from every real window id (0-4), fixing the bug where the
  main window's explicit-addressing branch coincided with the broadcast
  check (both were literal 0). SetFilter's main-window no-op is dropped
  — the main window's filter is now genuinely settable. ChatWindowController
  .Bind takes a ChatWindowState (the same canonical instance the floating
  windows already share) and GetTranscriptLines builds a real accept
  predicate instead of accept:null. Verified safe: ClientLocal (0x1A)
  never reaches ChatLog (AddText routes it to the SpewBox and returns),
  so nothing observable regresses.

- SHOULD-FIX 3: UiButton.SuppressSelfToggle stops the four chat-window
  indicator buttons (DAT property 0x0B=true, no retail click handler)
  from flipping their own Selected mirror on a stray click.

- SHOULD-FIX 4: generated and committed chat_floaty_2100005b.json from
  the real installed dats; added the permanent RetailLayoutFixtureGenerator
  entry. All three flagged FloatingChatWindowController assumptions
  (input field, title bar, close button) are confirmed correct against
  real data — no controller code changes needed. New finding: unlike the
  main window, ALL EIGHT floaty border/corner elements are live Type-9
  grips (the floaty's own title bar is its move handle), so a floaty
  window resizes from every edge and corner.

- SHOULD-FIX 5: register row AP-189 documents the shared-500-entry/
  200-line-tail vs retail's per-window 10,000-line scrollback depth gap.

- NITs 1-5: documented the filter-persistence-only-on-/saveautoui
  asymmetry and the reconnect-preserves-filters intent; corrected the
  research doc's modifier-mask mislabel and the "ONLY function" false
  superlative; moved WrapText off ChatWindowController onto
  ChatTranscriptRenderer, closing the circular dependency.

Full Release suite: 12,420 passed / 4 skipped / 0 failed (baseline
12,392/4/0 at 22020ef2; net +28 tests, zero regressions).

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

tests/AcDream.App.Tests/UI/Layout/ChatLayoutConformanceTests.cs

@@ -77,7 +77,7 @@ public class ChatLayoutConformanceTests
         var infos = FixtureLoader.LoadChatInfos();
         var layout = LayoutImporter.Build(infos, NoTex, null);
         var controller = ChatWindowController.Bind(
-            infos, layout, new ChatVM(new ChatLog()), () => NullCommandBus.Instance, null, null, NoTex);
+            infos, layout, new ChatVM(new ChatLog()), () => NullCommandBus.Instance, new ChatWindowState(), null, null, NoTex);
         Assert.NotNull(controller);
 
         UiElement? indicator = layout.FindElement(indicatorId);
@@ -91,6 +91,18 @@ public class ChatLayoutConformanceTests
         var button = Assert.IsType<UiButton>(indicator);
         Assert.Null(button.OnClick);
         Assert.Null(button.OnClickAt);
+
+        // CH6a/b REJECT-review SHOULD-FIX 3: OnClick==null is the wrong level
+        // to prove "inert" — the fixture's own 0x0B (ToggleBehavior) = true
+        // means a plain press/release would still flip UiButton's internal
+        // Selected mirror even with no OnClick bound. SuppressSelfToggle
+        // (set by ChatWindowController.Bind) is the actual guard; a press
+        // and release must leave Selected unchanged.
+        Assert.True(button.SuppressSelfToggle);
+        bool before = button.Selected;
+        button.OnEvent(new UiEvent(0, button, UiEventType.MouseDown, Data1: 2, Data2: 2));
+        button.OnEvent(new UiEvent(0, button, UiEventType.MouseUp, Data1: 2, Data2: 2));
+        Assert.Equal(before, button.Selected);
     }
 
     [Theory]
@@ -110,7 +122,7 @@ public class ChatLayoutConformanceTests
         var infos = FixtureLoader.LoadChatInfos();
         var layout = LayoutImporter.Build(infos, NoTex, null);
         var controller = ChatWindowController.Bind(
-            infos, layout, new ChatVM(new ChatLog()), () => NullCommandBus.Instance, null, null, NoTex);
+            infos, layout, new ChatVM(new ChatLog()), () => NullCommandBus.Instance, new ChatWindowState(), null, null, NoTex);
         Assert.NotNull(controller);
 
         UiElement? twin = layout.FindElement(lockedTwinId);
@@ -191,6 +203,7 @@ public class ChatLayoutConformanceTests
             layout,
             new ChatVM(new ChatLog()),
             () => NullCommandBus.Instance,
+            new ChatWindowState(),
             null,
             null,
             NoTex);
@@ -226,6 +239,7 @@ public class ChatLayoutConformanceTests
             layout,
             new ChatVM(new ChatLog()),
             () => NullCommandBus.Instance,
+            new ChatWindowState(),
             null,
             null,
             NoTex);
@@ -250,6 +264,7 @@ public class ChatLayoutConformanceTests
             layout,
             new ChatVM(new ChatLog()),
             () => NullCommandBus.Instance,
+            new ChatWindowState(),
             null,
             null,
             NoTex)!;
@@ -324,6 +339,27 @@ public class ChatLayoutConformanceTests
         Assert.True(topStrip!.WindowMoveHandle);
     }
 
+    [Theory]
+    [InlineData(0x1000069Bu)]   // TL corner
+    [InlineData(0x1000069Du)]   // TR corner
+    [InlineData(0x1000069Eu)]   // left edge
+    [InlineData(0x1000069Fu)]   // BL corner
+    [InlineData(0x100006A0u)]   // bottom edge
+    [InlineData(0x100006A1u)]   // BR corner
+    [InlineData(0x100006A2u)]   // right edge
+    public void MountedChatWindow_LiveGrip_ResolvesNonZeroSprite(uint elementId)
+    {
+        // CH6a/b REJECT-review BLOCKER 1: pre-fix, UiResizeGrip drew nothing —
+        // it was constructed without its ElementInfo/resolve pair, so all seven
+        // live Type-9 grips rendered NOTHING even though the fixture proves
+        // every one of them carries real authored art (the 0x06006129 family).
+        // This is the regression guard: every live grip must resolve a non-zero
+        // DirectState sprite id, not just decode the right BorderLocation.
+        var layout = FixtureLoader.LoadChat();
+        var grip = Assert.IsType<UiResizeGrip>(layout.FindElement(elementId));
+        Assert.NotEqual(0u, grip.SpriteFile);
+    }
+
     [Fact]
     public void MountedChatWindow_BottomRightGrip_GrowsBothAxes_NotOnlyShrinks()
     {
@@ -340,6 +376,7 @@ public class ChatLayoutConformanceTests
             layout,
             new ChatVM(new ChatLog()),
             () => NullCommandBus.Instance,
+            new ChatWindowState(),
             null,
             null,
             NoTex)!;
@@ -396,6 +433,7 @@ public class ChatLayoutConformanceTests
             layout,
             new ChatVM(new ChatLog()),
             () => NullCommandBus.Instance,
+            new ChatWindowState(),
             null,
             null,
             NoTex)!;