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/PaintHud/PaintHud.cs

@@ -1,20 +1,14 @@
 using System;
 using UnityEngine;
 using UnityEngine.UI;
-using UnityEngine.EventSystems;
 #if ENABLE_INPUT_SYSTEM
 using UnityEngine.InputSystem.UI;
 #endif
 
 /// <summary>
-/// In-game paint UI. Shows its panels only while the active <see cref="GameMode"/> is
-/// <see cref="PaintMode"/> (follows the manager's ModeChanged) and binds its widgets directly to the
-/// live <see cref="MeshPainter"/> fields, so edits apply immediately.
-///
-/// The layout (independently draggable sub-panels per channel + a global brush card) comes from the
-/// authored prefab (<see cref="layoutPrefab"/>). The BINDINGS live in code and are (re)applied at
-/// runtime by <see cref="WirePanel"/> against stable widget names - the prefab stores only the
-/// visual layout, never behaviour.
+/// In-game paint UI. Visible only while the active <see cref="GameMode"/> is <see cref="PaintMode"/>;
+/// binds its widgets directly to the live <see cref="MeshPainter"/> fields. The prefab stores only the
+/// visual layout; the bindings live in code, (re)applied by <see cref="WirePanel"/> against stable widget names.
 /// </summary>
 [DisallowMultipleComponent]
 public partial class PaintHud : MonoBehaviour
@@ -119,7 +113,6 @@ public partial class PaintHud : MonoBehaviour
         // (in BindPainter) overwrites them. The reset button restores exactly these.
         CaptureAuthoredLayout();
 
-        // The paint library now lives inside the authored layout prefab; bind its widgets like the brush panel.
         BindLibrary(_panel ? _panel.transform : null);
 
         // Bind as soon as a painter exists. With networked spawn-on-connect there is none at scene
@@ -443,11 +436,8 @@ public partial class PaintHud : MonoBehaviour
         return s;
     }
 
-    /// <summary>
-    /// Attaches (idempotently) a <see cref="DraggablePanel"/> to the whole panel so it can be dragged
-    /// from any of its non-interactive surface (header, padding, labels, background); the component
-    /// ignores presses that start on a widget (toggle, slider, colour picker).
-    /// </summary>
+    /// <summary>Attaches (idempotently) a <see cref="DraggablePanel"/> so the whole panel can be
+    /// dragged from any non-widget surface.</summary>
     private void MakeDraggable(Transform root, string panelName)
     {
         var panel = GeometryUtil.FindDeep(root, panelName) as RectTransform;