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/Layout/ChatWindowController.cs

@@ -49,6 +49,9 @@ public sealed class ChatWindowController
     private const uint UpSprite       = 0x06004C6Cu;   // up arrow (top button)
     private const uint DownSprite     = 0x06004C69u;   // down arrow (bottom button)
 
+    // Chat input focused-field background (element 0x10000016 Normal_focussed state).
+    private const uint InputFocusField  = 0x060011ABu;   // gold "lit" field when in write mode
+
     // Channel menu sprite ids (confirmed in chat element dump).
     private const uint MenuNormal       = 0x06004D65u;   // button face
     private const uint MenuPressed      = 0x06004D66u;   // button pressed
@@ -187,6 +190,8 @@ public sealed class ChatWindowController
             Anchors = ElementReader.ToAnchors(iInfo.Left, iInfo.Top, iInfo.Right, iInfo.Bottom),
             DatFont = datFont,
             Font    = debugFont,
+            SpriteResolve   = resolve,
+            FocusFieldSprite = InputFocusField,
         };
         inputBar.AddChild(c.Input);
         c.Input.OnSubmit = text => ChatCommandRouter.Submit(text, vm, busProvider(), c._activeChannel);
@@ -257,6 +262,28 @@ public sealed class ChatWindowController
             sendEl.LabelColor = new Vector4(1f, 0.92f, 0.72f, 1f);
         }
 
+        // ── Size the channel button to its label + reflow the input field ─
+        // Retail's talk-focus button autosizes to the selected channel name; the input
+        // field then fills the gap from the button's right edge to the Send button. The
+        // dat authors the button at a fixed 46px (too narrow for "Chat" once the LED +
+        // arrow are accounted for), so widen it to its content and shift the input.
+        // Recompute on every channel change (the button grows/shrinks with the label).
+        if (c.Menu is not null)
+        {
+            float inputRight = c.Input.Left + c.Input.Width;   // == Send button's left edge
+            void ReflowInputRow()
+            {
+                c.Menu.Width = System.MathF.Round(c.Menu.NaturalButtonWidth());
+                c.Menu.ResetAnchorCapture();
+                c.Input.Left  = c.Menu.Left + c.Menu.Width;
+                c.Input.Width = System.MathF.Max(40f, inputRight - c.Input.Left);
+                c.Input.ResetAnchorCapture();
+            }
+            var onChanged = c.Menu.OnChannelChanged;
+            c.Menu.OnChannelChanged = k => { onChanged?.Invoke(k); ReflowInputRow(); };
+            ReflowInputRow();
+        }
+
         // ── Max/min toggle — simplified gmMainChatUI::HandleMaximizeButton ──
         if (layout.FindElement(MaxMinId) is UiDatElement maxMinEl)
         {
@@ -349,33 +376,47 @@ public sealed class ChatWindowController
     /// <summary>
     /// Greedy word-wrap: split <paramref name="text"/> into fragments that each fit in
     /// <paramref name="maxW"/> pixels (per <paramref name="measure"/>), breaking at spaces.
-    /// A single word longer than the width overflows its own line (retail does not
+    /// A word that is itself wider than the line is broken at CHARACTER boundaries (no
-    /// hyphenate chat). Mirrors retail GlyphList::Recalculate's per-GlyphLine emission.
+    /// hyphen), packed onto the current line first — so a long unbroken token (e.g. a URL
+    /// or "wwwww…") wraps instead of overflowing, and a "You say," prefix stays on the same
+    /// row as the start of the message. Mirrors retail GlyphList::Recalculate's per-GlyphLine
+    /// emission (which breaks mid-glyph-run when a run exceeds the wrap width).
     /// </summary>
     public static IEnumerable<string> WrapText(string text, float maxW, Func<string, float> measure)
     {
         if (string.IsNullOrEmpty(text) || maxW <= 0f || measure(text) <= maxW)
         {
-            yield return text;
+            yield return text ?? string.Empty;
             yield break;
         }
 
         var line = new System.Text.StringBuilder();
         foreach (var word in text.Split(' '))
         {
-            if (line.Length == 0)
+            string sep = line.Length > 0 ? " " : string.Empty;
+            if (measure(line.ToString() + sep + word) <= maxW)
             {
-                line.Append(word);
+                line.Append(sep).Append(word);          // fits on the current line
+                continue;
             }
-            else if (measure(line.ToString() + " " + word) > maxW)
+            if (line.Length > 0 && measure(word) <= maxW)
             {
-                yield return line.ToString();
+                yield return line.ToString();            // word fits alone → push to a new line
                 line.Clear();
                 line.Append(word);
+                continue;
             }
-            else
+            // Word too long for any single line: char-wrap it, packing onto the current
+            // line's remaining space first (keeps the prefix with the message start).
+            if (line.Length > 0) line.Append(' ');
+            foreach (char ch in word)
             {
-                line.Append(' ').Append(word);
+                if (line.Length > 0 && measure(line.ToString() + ch) > maxW)
+                {
+                    yield return line.ToString();
+                    line.Clear();
+                }
+                line.Append(ch);
             }
         }
         if (line.Length > 0) yield return line.ToString();

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);
                 }
             }