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feat(D.2b): chat polish — typing fix, opacity, scrollbar 3-slice, retail channel menu

Visual-iteration batch (decomp-grounded), each fix verified against the retail screenshots:
- typing: UiElement.HitTest aborted on ClickThrough BEFORE walking children, so the
  ClickThrough UiDatElement panels blocked hit-testing to the input/transcript inside
  them. Check ClickThrough AFTER the child walk (it only gates whether THIS element
  claims the hit). Restores input focus + typing.
- opacity: UiElement.Opacity + a UiRenderContext alpha stack applied to sprite/rect
  draws (text bypasses it, stays sharp); chat frame Opacity=0.75 → translucent chat.
- brown sliver: grow the transcript panel up 9px to cover the dropped resize-bar strip.
- scrollbar: real 3-slice thumb (caps 0x06004C60/66 + tiled mid) + tiled track.
- max/min: shifted one button-width left of the scrollbar (dat right-anchors collide).
- system text now green (retail ChatMessageType 5; was yellow).
- word-wrap: transcript lines wrap to the panel width (greedy, ports GlyphList::Recalculate).
- channel menu reworked to retail gmMainChatUI::InitTalkFocusMenu: "Chat" button + a
  TWO-COLUMN popup of the 14 talk-focus items (Squelch, Tell to Selected, Chat to All,
  Tell to Fellows, ...) on a tan panel; channel items set the active outbound channel.

Build + 392 App tests green. Visual confirmation in progress.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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src/AcDream.App/Rendering/GameWindow.cs

@@ -1857,19 +1857,36 @@ public sealed class GameWindow : IDisposable
                     // Ctrl+C / Ctrl+A on the transcript need the keyboard for clipboard + modifiers.
                     // _uiHost.Keyboard is set by WireKeyboard above — it is non-null here.
                     chatController.Transcript.Keyboard = _uiHost.Keyboard;
-                    // Top-level retail window: user-positioned at the bottom-left, movable + resizable.
-                    // KEEP the dat-authored size (do NOT override Width/Height) so the child anchors
-                    // capture their dat margins on the first layout — the same reason the vitals root
-                    // keeps its dat size. The user resizes/moves from there.
+                    // Wrap the dat content in the universal 8-piece beveled window chrome —
+                    // the SAME UiNineSlicePanel the vitals window uses. The chat's own dat
+                    // layout only carries flat background sprites, so without this the window
+                    // has no retail-style border (the user asked for the vitals border). The
+                    // nine-slice IS the movable/resizable window; the dat content fills its
+                    // interior, inset by the border. The gmMainChatUI content is authored 490
+                    // wide (its transcript/input panels) — KEEP that width + the dat-authored
+                    // HEIGHT so the content's child anchors (input-bar-at-bottom, transcript-
+                    // fills) capture correct margins on first layout; resizing the frame reflows
+                    // them correctly from there.
+                    const int chatBorder = AcDream.App.UI.RetailChromeSprites.Border;
                     var chatRoot = chatController.Root;
-                    chatRoot.Left = 10;
-                    chatRoot.Top = 460;          // bottom-left default; pending the user's visual review
-                    chatRoot.Anchors = AcDream.App.UI.AnchorEdges.None;
-                    chatRoot.Draggable = true;
-                    chatRoot.Resizable = true;
-                    chatRoot.MinWidth = 200f;
-                    chatRoot.MinHeight = 80f;
-                    _uiHost.Root.AddChild(chatRoot);
+                    float contentW = 490f, contentH = chatRoot.Height;   // dat-authored height
+                    var chatFrame = new AcDream.App.UI.UiNineSlicePanel(ResolveChrome)
+                    {
+                        Left = 10, Top = 440,
+                        Width = contentW + 2 * chatBorder, Height = contentH + 2 * chatBorder,
+                        MinWidth = 200f, MinHeight = 90f,
+                        // Retail chat is translucent — fade the window's backgrounds/chrome
+                        // (text stays opaque). Configurable opacity is a later step; 0.75 reads
+                        // as see-through-but-readable. (retail SetDefaultOpacity ~0.5 / active 1.0)
+                        Opacity = 0.75f,
+                    };
+                    chatRoot.Left = chatBorder; chatRoot.Top = chatBorder;
+                    chatRoot.Width = contentW; chatRoot.Height = contentH;
+                    chatRoot.Anchors = AcDream.App.UI.AnchorEdges.Left | AcDream.App.UI.AnchorEdges.Top
+                                     | AcDream.App.UI.AnchorEdges.Right | AcDream.App.UI.AnchorEdges.Bottom;
+                    chatRoot.Draggable = false; chatRoot.Resizable = false;
+                    chatFrame.AddChild(chatRoot);
+                    _uiHost.Root.AddChild(chatFrame);
                     Console.WriteLine("[D.2b] retail chat window from LayoutDesc importer (0x21000006).");
                 }
                 else Console.WriteLine("[D.2b] chat: required role elements missing in 0x21000006.");