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.Library.cs

@@ -5,14 +5,10 @@ using UnityEngine;
 using UnityEngine.UI;
 
 /// <summary>
-/// Binder for the "Paintings" library panel. The panel's visual layout (Panel_Paintings, the scrollable
-/// list, an entry template, and the Save / Confirm dialogs) is authored inside the PaintHudPanel layout
-/// prefab - this code only finds those objects by their stable names and wires the behaviour, exactly like
-/// <see cref="WirePanel"/> does for the brush widgets. The list is populated by cloning the authored
-/// Lib_EntryTemplate per saved slot. Save opens a name dialog (an existing name is overwritten, with a
-/// warning shown while typing); Load applies the selected slot immediately; Delete goes through a
-/// confirmation dialog. Loading replaces the current painting and, when networked, re-broadcasts the
-/// loaded state to every other peer.
+/// Binder for the "Paintings" library panel, authored in the PaintHudPanel layout prefab and wired here
+/// by stable names (like <see cref="WirePanel"/> for the brush widgets). The list clones Lib_EntryTemplate
+/// per saved slot; Save overwrites by name (warned while typing), Load applies immediately (re-broadcast
+/// to peers when networked), Delete confirms.
 /// </summary>
 public partial class PaintHud
 {