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/ScriptableObject/PlayerPose.cs

@@ -15,6 +15,11 @@ public class PlayerPose : ScriptableObject
     [Tooltip("Display name shown for this pose in the pose selection menu.")]
     [SerializeField] private string title;
 
+    [Tooltip("Scale multiplier applied to the icon in the pose selection menu. 1 = fills the button's " +
+             "icon area (aspect preserved).")]
+    [Range(0.1f, 2f)]
+    [SerializeField] private float iconScale = 1f;
+
     [Tooltip("Clip held while the player is idle in this pose (looped if the clip itself loops, " +
              "otherwise frozen on its last frame). Authored for the paintman generic rig; clips for " +
              "other hierarchies will not retarget.")]
@@ -77,6 +82,7 @@ public class PlayerPose : ScriptableObject
     // Read-only accessors; semantics are documented on the serialized fields' tooltips above.
     public Sprite Icon => icon;
     public string Title => title;
+    public float IconScale => iconScale;
     public AnimationClip Clip => clip;
     public float ClipSpeed => clipSpeed;
     public AnimationClip WalkClip => walkClip;