feat(D.2b): chat wiring — menu/input sprites, button reflow, char-wrap, panel wash fix

- ChatWindowController: wires the menu chrome (popup bevel, row/checkbox
  sprites), the input focused-field sprite + keyboard, and autosizes the channel
  button + reflows the input field to start after it (anchor re-capture so the
  per-frame layout doesn't fight it). DefaultTextInput / write-mode focus hooked
  up.
- WrapText now breaks an over-long UNBROKEN token at character boundaries (no
  hyphen), packed onto the current line first — so a spaceless token wraps
  instead of overflowing, and a "You say," prefix stays on the same row as the
  start of the message.
- UiChatView: transcript background + selection highlight use DrawFill (sprite
  bucket) so the transcript text draws ON TOP instead of being dimmed by its own
  translucent rect background.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/AcDream.App/UI/UiChatView.cs

@@ -93,7 +93,11 @@ public sealed class UiChatView : UiElement
 
     protected override void OnDraw(UiRenderContext ctx)
     {
-        ctx.DrawRect(0, 0, Width, Height, BackgroundColor);
+        // Background must draw UNDER the transcript text. DrawStringDat emits into the
+        // sprite bucket which flushes BEFORE rects, so a DrawRect background would wash
+        // over the text. DrawFill routes the background through the sprite bucket too,
+        // submitted first → text on top.
+        ctx.DrawFill(0, 0, Width, Height, BackgroundColor);
 
         // Prefer the retail dat font when set; fall back to BitmapFont.
         var datFont = DatFont;
@@ -161,7 +165,9 @@ public sealed class UiChatView : UiElement
                         hx = Padding + bitmapFont!.MeasureWidth(text.Substring(0, c0));
                         hw = bitmapFont.MeasureWidth(text.Substring(c0, c1 - c0));
                     }
-                    ctx.DrawRect(hx, y, hw, lh, SelectionColor);
+                    // Highlight sits BEHIND the line's text → sprite bucket, submitted
+                    // before this line's DrawStringDat.
+                    ctx.DrawFill(hx, y, hw, lh, SelectionColor);
                 }
             }