Declutter action bars: overflow menu, browse toggle, conditional D20

Top bar stripped to turn navigation only (Prev, round badge, Clear, Next).
Roll All Initiative, Manage Sources, and Bulk Import moved to a new
overflow menu in the bottom bar. Player Characters also moved there.

Browse stat blocks is now an Eye/EyeOff toggle inside the search input
that switches between add mode and browse mode. Add button only appears
when entering a custom creature name. Roll All Initiative button shows
conditionally — only when bestiary creatures lack initiative values.

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

apps/web/src/components/ui/overflow-menu.tsx

@@ -0,0 +1,72 @@
+import { EllipsisVertical } from "lucide-react";
+import { type ReactNode, useEffect, useRef, useState } from "react";
+import { Button } from "./button";
+
+export interface OverflowMenuItem {
+	readonly icon: ReactNode;
+	readonly label: string;
+	readonly onClick: () => void;
+	readonly disabled?: boolean;
+}
+
+interface OverflowMenuProps {
+	readonly items: readonly OverflowMenuItem[];
+}
+
+export function OverflowMenu({ items }: OverflowMenuProps) {
+	const [open, setOpen] = useState(false);
+	const ref = useRef<HTMLDivElement>(null);
+
+	useEffect(() => {
+		if (!open) return;
+		function handleMouseDown(e: MouseEvent) {
+			if (ref.current && !ref.current.contains(e.target as Node)) {
+				setOpen(false);
+			}
+		}
+		function handleKeyDown(e: KeyboardEvent) {
+			if (e.key === "Escape") setOpen(false);
+		}
+		document.addEventListener("mousedown", handleMouseDown);
+		document.addEventListener("keydown", handleKeyDown);
+		return () => {
+			document.removeEventListener("mousedown", handleMouseDown);
+			document.removeEventListener("keydown", handleKeyDown);
+		};
+	}, [open]);
+
+	return (
+		<div ref={ref} className="relative">
+			<Button
+				type="button"
+				variant="ghost"
+				size="icon"
+				className="text-muted-foreground hover:text-hover-neutral"
+				onClick={() => setOpen((o) => !o)}
+				aria-label="More actions"
+				title="More actions"
+			>
+				<EllipsisVertical className="h-5 w-5" />
+			</Button>
+			{open && (
+				<div className="absolute bottom-full right-0 z-50 mb-1 min-w-48 rounded-md border border-border bg-card py-1 shadow-lg">
+					{items.map((item) => (
+						<button
+							key={item.label}
+							type="button"
+							className="flex w-full items-center gap-2 px-3 py-1.5 text-left text-sm text-foreground hover:bg-muted/20 disabled:pointer-events-none disabled:opacity-50"
+							disabled={item.disabled}
+							onClick={() => {
+								item.onClick();
+								setOpen(false);
+							}}
+						>
+							{item.icon}
+							{item.label}
+						</button>
+					))}
+				</div>
+			)}
+		</div>
+	);
+}