Add jsinspect-plus structural duplication gate, extract shared helpers

Add jsinspect-plus (AST-based structural duplication detector) to pnpm
check with threshold 50 / min 3 instances. Fix all findings:

- Extract condition icon/color maps to shared condition-styles.ts
- Extract useClickOutside hook (5 components)
- Extract dispatchAction + resolveAndRename in use-encounter
- Extract runEncounterAction in application layer (13 use cases)
- Extract findCombatant helper in domain (9 functions)
- Extract TraitSection in stat-block (4 trait rendering blocks)
- Extract DialogHeader in dialog.tsx (4 dialogs)

Net result: -263 lines across 40 files.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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

@@ -1,5 +1,6 @@
 import { EllipsisVertical } from "lucide-react";
-import { type ReactNode, useEffect, useRef, useState } from "react";
+import { type ReactNode, useRef, useState } from "react";
+import { useClickOutside } from "../../hooks/use-click-outside.js";
 import { Button } from "./button";
 
 export interface OverflowMenuItem {
@@ -18,23 +19,7 @@ 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]);
+	useClickOutside(ref, () => setOpen(false), open);
 
 	return (
 		<div ref={ref} className="relative">