Refactor Assets/Scripts: trim restating comments, minor structure cleanups

Sweep over 48 files (Editor/ excluded): remove comments that restate the
code, condense class summaries, fix three stale doc statements
(HsvColorPicker alpha bar, PaintHud layoutPrefab, MasterVolume
FallbackDefault). Inline two single-use wrappers (IsPointerOverUi,
BuildModes), drop an unused using, replace a magic literal with the
existing ParallaxBase constant, and convert ~10 UnityEngine.Object null
checks to the implicit-bool convention. No serialized fields, signatures,
RPC/NetworkVariable names, defaults, or #if blocks touched.

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

Assets/Scripts/Components/UI/DraggablePanel.cs

@@ -3,15 +3,9 @@ using UnityEngine.UI;
 using UnityEngine.EventSystems;
 
 /// <summary>
-/// Makes a UI panel draggable. Attach to the panel itself: it follows the pointer from any of the panel's
-/// non-interactive surface (title bar, padding, labels, background) but ignores presses that begin on a
-/// widget - a <see cref="Selectable"/> (toggle, slider, ...) or a <see cref="UiPointerSurface"/> (the
-/// colour-picker field) - so those keep their own click/drag behaviour. It keeps a slice of the panel on
-/// screen and raises it above its siblings while interacting.
-///
-/// Works under any canvas scale (it tracks the pointer in the drag area's local space and applies the
-/// movement delta) and under any anchor/pivot (the on-screen clamp is derived from the panel's real
-/// corners in its parent, not from a fixed top-left assumption).
+/// Makes a UI panel draggable from any non-interactive surface; presses that begin on a widget
+/// (<see cref="Selectable"/> or <see cref="UiPointerSurface"/>) keep their own click/drag behaviour.
+/// Keeps a slice of the panel on screen and raises it above siblings; canvas-scale/anchor/pivot-agnostic.
 /// </summary>
 [RequireComponent(typeof(RectTransform))]
 public class DraggablePanel : MonoBehaviour, IPointerDownHandler, IBeginDragHandler, IDragHandler, IEndDragHandler
@@ -40,8 +34,6 @@ public class DraggablePanel : MonoBehaviour, IPointerDownHandler, IBeginDragHand
 
     public void OnPointerDown(PointerEventData eventData)
     {
-        // Raise the panel when pressing its own surface. (A press that lands on a widget is consumed by
-        // that widget's own handler and never reaches us, so this rarely needs the guard - but it is cheap.)
         if (!StartedOnWidget(eventData)) BringToFront();
     }