use:components and remove storybook integration

src/lib/components/Button.svelte

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+<script lang="ts">
+	interface Props {
+		type?: 'button' | 'submit' | 'reset';
+		variant?: 'primary' | 'secondary';
+		disabled?: boolean;
+		formaction?: string;
+		children?: import('svelte').Snippet;
+	}
+
+	let {
+		type = 'button',
+		variant = 'primary',
+		disabled = false,
+		formaction,
+		children
+	}: Props = $props();
+</script>
+
+<button class="button {variant}" {type} {disabled} {formaction}>
+	{@render children?.()}
+</button>
+
+<style>
+	.button {
+		flex: 1;
+		padding: 1.25rem 2rem;
+		border: none;
+		border-radius: 2rem;
+		font-size: 1rem;
+		font-weight: 500;
+		transition: all 0.2s ease;
+		cursor: pointer;
+		height: 3.5rem;
+	}
+
+	.button:disabled {
+		opacity: 0.6;
+		cursor: not-allowed;
+		transform: none;
+	}
+
+	.button:disabled:hover {
+		transform: none;
+	}
+
+	.primary {
+		background-color: #3a4553;
+		color: white;
+	}
+
+	.primary:hover:not(:disabled) {
+		background-color: #2d3441;
+		transform: translateY(-1px);
+	}
+
+	.secondary {
+		background-color: #6c757d;
+		color: white;
+	}
+
+	.secondary:hover:not(:disabled) {
+		background-color: #5a6268;
+		transform: translateY(-1px);
+	}
+</style>

src/lib/components/ErrorMessage.svelte

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+<script lang="ts">
+	interface Props {
+		message?: string;
+		show?: boolean;
+	}
+
+	let { message, show = true }: Props = $props();
+</script>
+
+{#if message && show}
+	<p class="error-message">{message}</p>
+{/if}
+
+<style>
+	.error-message {
+		color: #e53e3e;
+		font-size: 0.875rem;
+		text-align: center;
+		margin-top: 1rem;
+		padding: 0.5rem;
+	}
+</style>

src/lib/components/Input.svelte

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+<script lang="ts">
+	interface Props {
+		name: string;
+		type?: 'text' | 'email' | 'password';
+		placeholder?: string;
+		required?: boolean;
+		value?: string;
+	}
+
+	let { name, type = 'text', placeholder, required = false, value = $bindable() }: Props = $props();
+</script>
+
+<div class="input-group">
+	<input class="input-field" {name} {type} {placeholder} {required} bind:value />
+</div>
+
+<style>
+	.input-group {
+		display: flex;
+		flex-direction: column;
+	}
+
+	.input-field {
+		padding: 1.25rem 1.5rem;
+		border: none;
+		border-radius: 2rem;
+		background-color: #e0e0e0;
+		font-size: 1rem;
+		color: #333;
+		outline: none;
+		transition: background-color 0.2s ease;
+		height: 3.5rem;
+	}
+
+	.input-field:focus {
+		background-color: #d5d5d5;
+	}
+
+	.input-field::placeholder {
+		color: #888;
+	}
+</style>

src/lib/components/UserInfo.svelte

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+<script lang="ts">
+	interface Props {
+		username: string;
+		id: string;
+		showId?: boolean;
+	}
+
+	let { username, id, showId = true }: Props = $props();
+</script>
+
+<div class="user-info">
+	<p class="greeting">Hi, {username}!</p>
+	{#if showId}
+		<p class="user-id">Your user ID is {id}.</p>
+	{/if}
+</div>
+
+<style>
+	.user-info {
+		margin-bottom: 2rem;
+		text-align: center;
+	}
+
+	.greeting {
+		font-size: 1.25rem;
+		color: #333;
+		margin-bottom: 0.5rem;
+		font-weight: 500;
+	}
+
+	.user-id {
+		font-size: 0.95rem;
+		color: #666;
+		margin-bottom: 0;
+		font-family: monospace;
+	}
+
+	@media (max-width: 480px) {
+		.greeting {
+			font-size: 1.1rem;
+		}
+
+		.user-id {
+			font-size: 0.85rem;
+		}
+	}
+</style>