Add export method dialog, extract shared Dialog primitive

Add export dialog with download/clipboard options and optional
undo/redo history inclusion (default off). Extract shared Dialog
component to ui/dialog.tsx, consolidating open/close lifecycle,
backdrop click, and escape key handling from all 6 dialog components.
Update spec to reflect export method dialog and optional history.

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

apps/web/src/components/import-method-dialog.tsx

@@ -1,6 +1,7 @@
 import { ClipboardPaste, FileUp, X } from "lucide-react";
 import { useCallback, useEffect, useRef, useState } from "react";
 import { Button } from "./ui/button.js";
+import { Dialog } from "./ui/dialog.js";
 
 interface ImportMethodDialogProps {
 	open: boolean;
@@ -15,30 +16,22 @@ export function ImportMethodDialog({
 	onSubmitClipboard,
 	onClose,
 }: Readonly<ImportMethodDialogProps>) {
-	const dialogRef = useRef<HTMLDialogElement>(null);
 	const textareaRef = useRef<HTMLTextAreaElement>(null);
 	const [mode, setMode] = useState<"pick" | "paste">("pick");
 	const [pasteText, setPasteText] = useState("");
 
-	const reset = useCallback(() => {
+	const handleClose = useCallback(() => {
 		setMode("pick");
 		setPasteText("");
-	}, []);
-
-	const handleClose = useCallback(() => {
-		reset();
 		onClose();
-	}, [reset, onClose]);
+	}, [onClose]);
 
 	useEffect(() => {
-		const dialog = dialogRef.current;
-		if (!dialog) return;
-		if (open && !dialog.open) dialog.showModal();
-		else if (!open && dialog.open) {
-			dialog.close();
-			reset();
+		if (!open) {
+			setMode("pick");
+			setPasteText("");
 		}
-	}, [open, reset]);
+	}, [open]);
 
 	useEffect(() => {
 		if (mode === "paste") {
@@ -46,29 +39,8 @@ export function ImportMethodDialog({
 		}
 	}, [mode]);
 
-	useEffect(() => {
-		const dialog = dialogRef.current;
-		if (!dialog) return;
-		function handleCancel(e: Event) {
-			e.preventDefault();
-			handleClose();
-		}
-		function handleBackdropClick(e: MouseEvent) {
-			if (e.target === dialog) handleClose();
-		}
-		dialog.addEventListener("cancel", handleCancel);
-		dialog.addEventListener("mousedown", handleBackdropClick);
-		return () => {
-			dialog.removeEventListener("cancel", handleCancel);
-			dialog.removeEventListener("mousedown", handleBackdropClick);
-		};
-	}, [handleClose]);
-
 	return (
-		<dialog
-			ref={dialogRef}
-			className="m-auto w-80 rounded-lg border border-border bg-card p-6 text-foreground shadow-xl backdrop:bg-black/50"
-		>
+		<Dialog open={open} onClose={handleClose} className="w-80">
 			<div className="mb-4 flex items-center justify-between">
 				<h2 className="font-semibold text-lg">Import Encounter</h2>
 				<Button
@@ -148,6 +120,6 @@ export function ImportMethodDialog({
 					</div>
 				</div>
 			)}
-		</dialog>
+		</Dialog>
 	);
 }