feat(D.2b): window resize (UiRoot edge-grip resize-drag mode)

Add parallel resize mode to the UiRoot retained-mode input state machine.
A left-drag starting within ResizeGrip=5px of a Resizable window's edge or
corner resizes it (min-size clamped); interior drags on a Draggable window
still reposition it.

Changes:
- UiElement: Resizable, MinWidth, MinHeight properties
- UiRoot: ResizeEdges flags enum; _resizeTarget state fields; FindWindow
  (replaces FindDraggable, matches Draggable||Resizable); HitEdges (static,
  internal, testable); ResizeRect (static, public, testable); OnMouseDown
  checks edge-grip before move; OnMouseMove resize branch precedes move;
  OnMouseUp clears _resizeTarget
- UiNineSlicePanel: Resizable = true (retail windows are resizable)
- UiRootInputTests: 4 new tests — ResizeRect_RightBottom, ResizeRect_LeftTop
  (min-clamp + origin shift), HitEdges_DetectsCornerAndInteriorNone,
  EdgeDrag_ResizesPanel_InteriorDragMoves (full integration path)

Note on test coordinate: right-edge grab uses x=298 (2px inside the panel's
hit-test boundary) rather than x=300 (exactly at edge, misses OnHitTest's
strict `<` check). This is intentional — the grip zone extends inward from
the edge boundary, so a click 2px inside correctly lands in both the
hit-test rect AND the resize-grip zone.

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

src/AcDream.App/UI/UiElement.cs

@@ -93,6 +93,14 @@ public abstract class UiElement
     /// whose Left/Top are screen coordinates (Root sits at the origin).</summary>
     public bool Draggable { get; set; }
 
+    /// <summary>If true, a left-drag starting near this element's edge/corner
+    /// resizes it (window resize). Intended for top-level panels.</summary>
+    public bool Resizable { get; set; }
+
+    /// <summary>Minimum size enforced while resizing.</summary>
+    public float MinWidth { get; set; } = 40f;
+    public float MinHeight { get; set; } = 40f;
+
     // ── Tree structure ──────────────────────────────────────────────────
     public UiElement? Parent { get; private set; }