fix(chargen): Campaign CC gate round 1 re-test 3 — R4-1..R4-4

Four visual residuals from the lead's own live-client captures of
1.0.2-cc.m, all root-caused via decomp + live-DAT evidence:

- R4-1: Skills credits value overlapped mid-caption again. Root cause
  was a missing UiLayoutPolicy raw-edge reflow on UiButton's value-child
  rect (the child is base-inherited across four sibling buttons of
  differing widths, so its baked-in OriginalParentWidth diverges from
  the actual 231px-wide Skills credits button) plus an HJustify.Right
  value child mapped to Center instead of a real far-edge Right.
- R4-2: the single-sprite scrollbar thumb tiled (GL_REPEAT) instead of
  drawing once — DrawTiled was reused for a small fixed marker graphic
  whose native size is far smaller than the track-proportional thumb
  rect. New DrawThumbMarker draws exactly one native-size instance.
- R4-3: the skills info-box formula line clipped past the surrounding
  gold frame's own authored bottom edge (the pane's own raw box is 20px
  taller than the frame that visually contains it) — clamp the pane's
  Height to the frame's bottom (register AD-105, since retail's
  ShowSkillsText has no code relationship to the frame to cite).
- R4-4: the Appearance help text started mid-sentence — the box was
  never touched by its page controller, so it kept UiText's chat-style
  PreserveEndOnLayout=true default; the scroll model's wasAtEnd check is
  vacuously true on its first-ever overflow transition, pinning the
  first render to the bottom. Set PreserveEndOnLayout=false (a static
  top-oriented report, not a transcript) and wired the box's own nested
  authored scrollbar, never wired before.

App suite live-DAT env 5372/3 -> 5379/3 (+7, zero regressions). Runtime
1735/0 unchanged. Full solution 14585/4 skips/1 failure (the documented
Core.Net NakEmission full-solution-only flake, confirmed standalone-pass).

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

src/AcDream.App/UI/Layout/CharacterCreationSkillsPage.cs

@@ -341,8 +341,46 @@ internal sealed class CharacterCreationSkillsPage : IDisposable
             infoTitle.VerticalJustify = VJustify.Top;
         if (_infoText is { } infoText)
             infoText.VerticalJustify = VJustify.Top;
+
+        // R4-3 (Campaign CC gate round 1 re-test 3): the description pane's
+        // own raw box (0x100003fc, Y=460 H=100 -> bottom Y=560, live-DAT-
+        // measured) extends 20px PAST the bottom of the gold decorative
+        // frame that visually contains BOTH info panes (0x100003fa, Y=430
+        // H=110 -> bottom Y=540, the SAME GF-12 corner/edge sprite family
+        // Batch C un-consumed — 0x100002de-e3/0x100000e8/0xea). Retail's own
+        // ShowSkillsText @0x00481250 has NO code relationship between the
+        // text panes and this frame (SetText only; no clip/size handoff),
+        // and the frame's 8 children carry no dat property linking them to
+        // 0x100003fc either — so the frame's own geometry is the only
+        // authored ground truth for "the visible box," and this port's
+        // multi-line clip (UiText.DrawText's own PushClip(0,0,Width,Height))
+        // was using the WRONG (larger, unbounded) Height, letting a long
+        // skill's formula line draw into blank page space below the frame's
+        // own border instead of being contained by it. Clamped to the
+        // frame's own bottom edge (never grows it — additive, defensive if a
+        // future dat re-extract makes the frame taller than the pane).
+        // Scoped exactly like the VJustify.Top correction above: this is
+        // NOT the client-wide "does a text pane's clip account for a
+        // sibling decorative frame" mechanism (no evidence any other pane in
+        // this codebase has the SAME independently-authored-taller-than-its-
+        // frame shape), so a general import-time fix is unwarranted here.
+        if (_infoText is { } clampedInfoText
+            && UiElement.FindDescendant(pageRoot, InfoBoxFrameElementId) is { } frame)
+        {
+            float frameBottom = frame.Top + frame.Height;
+            float paneBottom = clampedInfoText.Top + clampedInfoText.Height;
+            if (frameBottom < paneBottom)
+                clampedInfoText.Height = frameBottom - clampedInfoText.Top;
+        }
     }
 
+    /// <summary>
+    /// The gold decorative frame (Type 12, 8 sprite children — the SAME
+    /// GF-12 corner/edge family) that visually contains BOTH info panes
+    /// (<c>0x100003fb</c>/<c>0x100003fc</c>) — see the R4-3 clamp above.
+    /// </summary>
+    private const uint InfoBoxFrameElementId = 0x100003FAu;
+
     internal void Refresh(
         IRuntimeCharacterCreationView view,
         RuntimeCharacterCreationSnapshot snapshot)