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/Network/SpectatorSetup.cs

@@ -2,12 +2,10 @@ using Unity.Netcode;
 using UnityEngine;
 
 /// <summary>
-/// Per-avatar glue for a mid-match SPECTATOR. The spectator object is deliberately empty - no body, no
-/// renderer, no collider, no controller - because the free-fly camera is a separate, persistent scene
-/// object (in Main) that drives its own rig off Camera.main and needs nothing from this avatar. So the
-/// spectator only has to exist as the owner's player object and flip the local mode set to free-cam-only.
-/// The owner does that here; remote peers do nothing (there is no body to show or simulate). When the
-/// host ends the match, MatchManager respawns this client as a neutral lobby Player.
+/// Per-avatar glue for a mid-match SPECTATOR. The spectator object is deliberately empty (no body,
+/// renderer, collider or controller) - the free-fly camera is a separate, persistent scene object in
+/// Main, so this only has to exist as the owner's player object and flip the local mode set to
+/// free-cam-only; remote peers do nothing. MatchManager respawns it as a lobby Player at match end.
 /// </summary>
 [DisallowMultipleComponent]
 public class SpectatorSetup : NetworkBehaviour