add gtk typings and renderer for window

lib/jsx/types/gtk.ts

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+import Gtk40 from "gi://Gtk?version=4.0";
+
+export const GtkClasses = {
+	window: Gtk40.Window,
+};
+export type GtkElements = {
+	[K in keyof typeof GtkClasses]: ConstructorParameters<
+		(typeof GtkClasses)[K]
+	>[0];
+};
+export type GtkTag = keyof typeof GtkClasses;

lib/jsx/types/index.ts

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+export * from "./gtk";
+export * from "./jsx";

lib/jsx/types/jsx.ts

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+import type { JSX } from "@lib/jsx/jsx-runtime";
+
+export type RenderedNode = JSX.Element;
+
+export type JSXNode =
+	| RenderedNode
+	| (() => JSXNode)
+	| boolean
+	| number
+	| bigint
+	| string
+	| null
+	| undefined;
+
+export interface JSXChildren {
+	children?: JSXNode | JSXNode[] | undefined;
+}
+
+export type FunctionComponent = (
+	props?: Record<string, unknown>,
+) => RenderedNode;