chore: add spinner component (#16014)

This component is necessary to move forward with the "[Define a global
button style](https://github.com/coder/coder/issues/14978)" issue, as it
requires buttons to support loading states with spinners. The `Spinner`
component is heavily inspired by the [Radix UI Spinner
component](https://www.radix-ui.com/themes/docs/components/spinner) and
was developed with the help of [v0](https://v0.dev/).

**Preview**
![Screen Recording 2025-01-02 at 14 37
18](https://github.com/user-attachments/assets/838f6bb2-2125-4a55-9bee-3b3a52852d40)

---------

Co-authored-by: Jaayden Halko <jaayden.halko@gmail.com>

site/src/components/Loader/Loader.tsx

@@ -1,5 +1,5 @@
 import type { Interpolation, Theme } from "@emotion/react";
-import { Spinner } from "components/Spinner/Spinner";
+import { Spinner } from "components/deprecated/Spinner/Spinner";
 import type { FC, HTMLAttributes } from "react";
 
 interface LoaderProps extends HTMLAttributes<HTMLDivElement> {

site/src/components/Spinner/Spinner.stories.tsx

@@ -0,0 +1,20 @@
+import type { Meta, StoryObj } from "@storybook/react";
+import { PlusIcon } from "lucide-react";
+import { Spinner } from "./Spinner";
+
+const meta: Meta<typeof Spinner> = {
+	title: "components/Spinner",
+	component: Spinner,
+	args: {
+		children: <PlusIcon className="size-icon-lg" />,
+	},
+};
+
+export default meta;
+type Story = StoryObj<typeof Spinner>;
+
+export const Idle: Story = {};
+
+export const Loading: Story = {
+	args: { loading: true },
+};

site/src/components/Spinner/Spinner.tsx

@@ -1,22 +1,77 @@
-import CircularProgress, {
-	type CircularProgressProps,
-} from "@mui/material/CircularProgress";
-import isChromatic from "chromatic/isChromatic";
-import type { FC } from "react";
-
 /**
- * Spinner component used to indicate loading states. This component abstracts
- * the MUI CircularProgress to provide better control over its rendering,
- * especially in snapshot tests with Chromatic.
+ * This component was inspired by
+ * https://www.radix-ui.com/themes/docs/components/spinner and developed using
+ * https://v0.dev/ help.
  */
-export const Spinner: FC<CircularProgressProps> = (props) => {
-	/**
-	 * During Chromatic snapshots, we render the spinner as determinate to make it
-	 * static without animations, using a deterministic value (75%).
-	 */
-	if (isChromatic()) {
-		props.variant = "determinate";
-		props.value = 75;
+
+import isChromatic from "chromatic/isChromatic";
+import { type VariantProps, cva } from "class-variance-authority";
+import type { ReactNode } from "react";
+import { cn } from "utils/cn";
+
+const leaves = 8;
+
+const spinnerVariants = cva("", {
+	variants: {
+		size: {
+			lg: "size-icon-lg",
+			sm: "size-icon-sm",
+		},
+	},
+	defaultVariants: {
+		size: "lg",
+	},
+});
+
+type SpinnerProps = React.SVGProps<SVGSVGElement> &
+	VariantProps<typeof spinnerVariants> & {
+		children?: ReactNode;
+		loading?: boolean;
+	};
+
+export function Spinner({
+	className,
+	size,
+	loading,
+	children,
+	...props
+}: SpinnerProps) {
+	if (!loading) {
+		return children;
 	}
-	return <CircularProgress {...props} />;
-};
+
+	return (
+		<svg
+			viewBox="0 0 24 24"
+			xmlns="http://www.w3.org/2000/svg"
+			fill="currentColor"
+			className={cn(spinnerVariants({ size, className }))}
+			{...props}
+		>
+			<title>Loading spinner</title>
+			{[...Array(leaves)].map((_, i) => {
+				const rotation = i * (360 / leaves);
+
+				return (
+					<rect
+						key={i}
+						x="10.9"
+						y="2"
+						width="2"
+						height="5.5"
+						rx="1"
+						// 0.8 = leaves * 0.1
+						className={
+							isChromatic() ? "" : "animate-[loading_0.8s_ease-in-out_infinite]"
+						}
+						style={{
+							transform: `rotate(${rotation}deg)`,
+							transformOrigin: "center",
+							animationDelay: `${-i * 0.1}s`,
+						}}
+					/>
+				);
+			})}
+		</svg>
+	);
+}

site/src/components/deprecated/Spinner/Spinner.tsx

@@ -0,0 +1,24 @@
+import CircularProgress, {
+	type CircularProgressProps,
+} from "@mui/material/CircularProgress";
+import isChromatic from "chromatic/isChromatic";
+import type { FC } from "react";
+
+/**
+ * Spinner component used to indicate loading states. This component abstracts
+ * the MUI CircularProgress to provide better control over its rendering,
+ * especially in snapshot tests with Chromatic.
+ *
+ * @deprecated prefer `components.Spinner`
+ */
+export const Spinner: FC<CircularProgressProps> = (props) => {
+	/**
+	 * During Chromatic snapshots, we render the spinner as determinate to make it
+	 * static without animations, using a deterministic value (75%).
+	 */
+	if (isChromatic()) {
+		props.variant = "determinate";
+		props.value = 75;
+	}
+	return <CircularProgress {...props} />;
+};

site/tailwind.config.js

@@ -58,6 +58,15 @@ module.exports = {
 					5: "hsl(var(--chart-5))",
 				},
 			},
+			keyframes: {
+				loading: {
+					"0%": { opacity: 0.85 },
+					"25%": { opacity: 0.7 },
+					"50%": { opacity: 0.4 },
+					"75%": { opacity: 0.3 },
+					"100%": { opacity: 0.2 },
+				},
+			},
 		},
 	},
 	plugins: [require("tailwindcss-animate")],