Add import method dialog with file upload and paste options

Replace direct file picker trigger with a modal offering two import
methods: file upload and paste JSON content. Uses a textarea instead
of navigator.clipboard.readText() to avoid browser permission prompts.
Also centers both import dialogs and updates spec for clipboard import.

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

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

@@ -0,0 +1,153 @@
+import { ClipboardPaste, FileUp, X } from "lucide-react";
+import { useCallback, useEffect, useRef, useState } from "react";
+import { Button } from "./ui/button.js";
+
+interface ImportMethodDialogProps {
+	open: boolean;
+	onSelectFile: () => void;
+	onSubmitClipboard: (text: string) => void;
+	onClose: () => void;
+}
+
+export function ImportMethodDialog({
+	open,
+	onSelectFile,
+	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(() => {
+		setMode("pick");
+		setPasteText("");
+	}, []);
+
+	const handleClose = useCallback(() => {
+		reset();
+		onClose();
+	}, [reset, onClose]);
+
+	useEffect(() => {
+		const dialog = dialogRef.current;
+		if (!dialog) return;
+		if (open && !dialog.open) dialog.showModal();
+		else if (!open && dialog.open) {
+			dialog.close();
+			reset();
+		}
+	}, [open, reset]);
+
+	useEffect(() => {
+		if (mode === "paste") {
+			textareaRef.current?.focus();
+		}
+	}, [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"
+		>
+			<div className="mb-4 flex items-center justify-between">
+				<h2 className="font-semibold text-lg">Import Encounter</h2>
+				<Button
+					type="button"
+					variant="ghost"
+					size="icon-sm"
+					onClick={handleClose}
+					className="text-muted-foreground"
+				>
+					<X className="h-4 w-4" />
+				</Button>
+			</div>
+			{mode === "pick" && (
+				<div className="flex flex-col gap-2">
+					<button
+						type="button"
+						className="flex items-center gap-3 rounded-lg border border-border px-4 py-3 text-left text-foreground text-sm hover:bg-hover-neutral-bg"
+						onClick={() => {
+							handleClose();
+							onSelectFile();
+						}}
+					>
+						<FileUp className="h-5 w-5 text-muted-foreground" />
+						<div>
+							<div className="font-medium">From file</div>
+							<div className="text-muted-foreground text-xs">
+								Upload a JSON file
+							</div>
+						</div>
+					</button>
+					<button
+						type="button"
+						className="flex items-center gap-3 rounded-lg border border-border px-4 py-3 text-left text-foreground text-sm hover:bg-hover-neutral-bg"
+						onClick={() => setMode("paste")}
+					>
+						<ClipboardPaste className="h-5 w-5 text-muted-foreground" />
+						<div>
+							<div className="font-medium">Paste content</div>
+							<div className="text-muted-foreground text-xs">
+								Paste JSON content directly
+							</div>
+						</div>
+					</button>
+				</div>
+			)}
+			{mode === "paste" && (
+				<div className="flex flex-col gap-3">
+					<textarea
+						ref={textareaRef}
+						value={pasteText}
+						onChange={(e) => setPasteText(e.target.value)}
+						placeholder="Paste exported JSON here..."
+						className="h-32 w-full resize-none rounded-md border border-border bg-background px-3 py-2 font-mono text-foreground text-xs placeholder:text-muted-foreground focus:border-accent focus:outline-none"
+					/>
+					<div className="flex justify-end gap-2">
+						<Button
+							type="button"
+							variant="ghost"
+							onClick={() => {
+								setMode("pick");
+								setPasteText("");
+							}}
+						>
+							Back
+						</Button>
+						<Button
+							type="button"
+							disabled={pasteText.trim().length === 0}
+							onClick={() => {
+								const text = pasteText;
+								handleClose();
+								onSubmitClipboard(text);
+							}}
+						>
+							Import
+						</Button>
+					</div>
+				</div>
+			)}
+		</dialog>
+	);
+}