fix: smooth mobile edit transition and align modal validation behavior (#286)

* fix: reliable Escape key close for all modals via useEscapeKey hook

- Add useEscapeKey hook (document-level keydown listener)
- Retrofit all 12 modal/overlay components to use it
- Remove redundant overlay onKeyDown Escape handlers
- Simplify modal-content onKeyDown to plain stopPropagation
- Replace MedDetailModal's capture-phase useEffect with 3 useEscapeKey calls
- Replace SharedSchedule's inline useEffect with useEscapeKey
- Add mandatory modal rules to UI Consistency skill
- All 777 frontend + 569 backend tests pass

* fix: smooth mobile edit transition and align modal validation behavior

* fix: keep overlay keydown non-closing for Enter key

* fix: show mobile name error when validation already exists

* fix: restore app-level escape priority handling

* fix: prioritize schedule lightbox on Escape

frontend/src/components/Auth.tsx

@@ -1,6 +1,7 @@
 /* biome-ignore-all lint/correctness/useExhaustiveDependencies: auth refresh callbacks intentionally coordinate via refs/guards */
 import { createContext, type ReactNode, useCallback, useContext, useEffect, useRef, useState } from "react";
 import { useTranslation } from "react-i18next";
+import { useEscapeKey } from "../hooks/useEscapeKey";
 import { log } from "../utils/logger";
 import { ConfirmModal } from "./ConfirmModal";
 import { PasswordInput } from "./PasswordInput";
@@ -581,16 +582,7 @@ export function UserProfile({ onClose }: { onClose?: () => void }) {
 	const [deleteLoading, setDeleteLoading] = useState(false);
 	const fileInputRef = useRef<HTMLInputElement>(null);
 
-	// Close on Escape key
-	useEffect(() => {
-		const handleEscape = (e: KeyboardEvent) => {
-			if (e.key === "Escape" && onClose) {
-				onClose();
-			}
-		};
-		document.addEventListener("keydown", handleEscape);
-		return () => document.removeEventListener("keydown", handleEscape);
-	}, [onClose]);
+	useEscapeKey(!!onClose, onClose ?? (() => {}));
 
 	async function handleAvatarUpload(e: React.ChangeEvent<HTMLInputElement>) {
 		const file = e.target.files?.[0];