Add player character management feature

Persistent player character templates (name, AC, HP, color, icon) with
full CRUD, bestiary-style search to add PCs to encounters with pre-filled
stats, and color/icon visual distinction in combatant rows. Also stops
the stat block panel from auto-opening when adding a creature.

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

apps/web/src/components/icon-grid.tsx

@@ -0,0 +1,38 @@
+import type { PlayerIcon } from "@initiative/domain";
+import { VALID_PLAYER_ICONS } from "@initiative/domain";
+import { cn } from "../lib/utils";
+import { PLAYER_ICON_MAP } from "./player-icon-map";
+
+interface IconGridProps {
+	value: string;
+	onChange: (icon: string) => void;
+}
+
+const ICONS = [...VALID_PLAYER_ICONS] as PlayerIcon[];
+
+export function IconGrid({ value, onChange }: IconGridProps) {
+	return (
+		<div className="flex flex-wrap gap-2">
+			{ICONS.map((iconId) => {
+				const Icon = PLAYER_ICON_MAP[iconId];
+				return (
+					<button
+						key={iconId}
+						type="button"
+						onClick={() => onChange(iconId)}
+						className={cn(
+							"flex h-9 w-9 items-center justify-center rounded-md transition-all",
+							value === iconId
+								? "bg-primary/20 ring-2 ring-primary text-foreground"
+								: "text-muted-foreground hover:bg-card hover:text-foreground",
+						)}
+						aria-label={iconId}
+						title={iconId}
+					>
+						<Icon size={20} />
+					</button>
+				);
+			})}
+		</div>
+	);
+}