Make player character color and icon optional

Clicking an already-selected color or icon in the create/edit form now
deselects it. PCs without a color use the default combatant styling;
PCs without an icon show no icon. Domain, application, persistence,
and display layers all updated to handle the optional fields.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/web/src/components/create-player-modal.tsx

@@ -13,8 +13,8 @@ interface CreatePlayerModalProps {
 		name: string,
 		ac: number,
 		maxHp: number,
-		color: string,
-		icon: string,
+		color: string | undefined,
+		icon: string | undefined,
 	) => void;
 	playerCharacter?: PlayerCharacter;
 }
@@ -40,14 +40,14 @@ export function CreatePlayerModal({
 				setName(playerCharacter.name);
 				setAc(String(playerCharacter.ac));
 				setMaxHp(String(playerCharacter.maxHp));
-				setColor(playerCharacter.color);
-				setIcon(playerCharacter.icon);
+				setColor(playerCharacter.color ?? "");
+				setIcon(playerCharacter.icon ?? "");
 			} else {
 				setName("");
 				setAc("10");
 				setMaxHp("10");
-				setColor("blue");
-				setIcon("sword");
+				setColor("");
+				setIcon("");
 			}
 			setError("");
 		}
@@ -81,7 +81,7 @@ export function CreatePlayerModal({
 			setError("Max HP must be at least 1");
 			return;
 		}
-		onSave(trimmed, acNum, hpNum, color, icon);
+		onSave(trimmed, acNum, hpNum, color || undefined, icon || undefined);
 		onClose();
 	};