refactor: only include template in share url if it's custom

src/lib/components/Modal.svelte

@@ -0,0 +1,25 @@
+<script lang="ts">
+	let { onClose, children }: { onClose: () => void; children: any } = $props();
+
+	function handleKeydown(e: KeyboardEvent) {
+		if (e.key === 'Escape') onClose();
+	}
+</script>
+
+<svelte:window onkeydown={handleKeydown} />
+
+<!-- svelte-ignore a11y_no_static_element_interactions -->
+<div
+	class="fixed inset-0 z-50 flex items-center justify-center"
+	onmousedown={onClose}
+>
+	<div class="absolute inset-0 bg-black/50"></div>
+	<!-- svelte-ignore a11y_no_static_element_interactions -->
+	<div
+		class="relative rounded-lg shadow-xl max-w-md w-full mx-4 p-6"
+		style="background: var(--bg-card); color: var(--text);"
+		onmousedown={(e) => e.stopPropagation()}
+	>
+		{@render children()}
+	</div>
+</div>