Add pose icon capture pipeline, icon scale, Esc/Tab opens overview in paint mode

- PoseIconStage: permanent editor capture pipeline (context menu 'Capture All Icons') — renders each entry at 4096x4096, alpha-crops, writes Icon_pose_*.png and wires sprites onto matching PlayerPose assets
- PlayerPose: new iconScale property (0.1-2), applied to the icon child in PoseMenu's radial layout
- OverviewMenu: paint-mode special-case removed — Esc/Tab opens the overview menu in every mode

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

Assets/Scripts/Components/UI/PoseMenu.cs

@@ -132,6 +132,7 @@ public class PoseMenu : MonoBehaviour
                 icon.sprite = p ? p.Icon : null;
                 icon.preserveAspect = true;
                 icon.enabled = icon.sprite; // no icon authored -> no solid white square
+                icon.rectTransform.localScale = Vector3.one * (p ? p.IconScale : 1f);
             }
             TMP_Text label = item.GetComponentInChildren<TMP_Text>(true);
             if (label) label.text = p && !string.IsNullOrEmpty(p.Title) ? p.Title : (p ? p.name : "");