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/roll-mode-menu.tsx

@@ -1,6 +1,7 @@
 import type { RollMode } from "@initiative/domain";
 import { ChevronsDown, ChevronsUp } from "lucide-react";
-import { useEffect, useLayoutEffect, useRef, useState } from "react";
+import { useLayoutEffect, useRef, useState } from "react";
+import { useClickOutside } from "../hooks/use-click-outside.js";
 
 interface RollModeMenuProps {
 	readonly position: { x: number; y: number };
@@ -34,22 +35,7 @@ export function RollModeMenu({
 		setPos({ top, left });
 	}, [position.x, position.y]);
 
-	useEffect(() => {
-		function handleMouseDown(e: MouseEvent) {
-			if (ref.current && !ref.current.contains(e.target as Node)) {
-				onClose();
-			}
-		}
-		function handleKeyDown(e: KeyboardEvent) {
-			if (e.key === "Escape") onClose();
-		}
-		document.addEventListener("mousedown", handleMouseDown);
-		document.addEventListener("keydown", handleKeyDown);
-		return () => {
-			document.removeEventListener("mousedown", handleMouseDown);
-			document.removeEventListener("keydown", handleKeyDown);
-		};
-	}, [onClose]);
+	useClickOutside(ref, onClose);
 
 	return (
 		<div