git stacks can now set a custom icon

src/lib/utils/stack-icon.ts

@@ -0,0 +1,23 @@
+/**
+ * Persist a stack icon to the name-based /api/stacks/[name]/icon endpoint. Shared by
+ * StackModal and GitStackModal so the DELETE/upload/set contract lives in one place. The
+ * caller builds `target` (it owns env resolution and create-vs-edit gating); `value` is
+ * the picker output: '' -> clear (DELETE), 'upload:<dataUrl>' -> custom upload, else a
+ * lucide/selfhst ref. Returns the new icon on success, null after a clear, and undefined
+ * when a POST failed (so the caller leaves the current icon untouched).
+ */
+export async function persistStackIcon(target: string, value: string): Promise<string | null | undefined> {
+	if (!value) {
+		await fetch(target, { method: 'DELETE' });
+		return null;
+	}
+	const body = value.startsWith('upload:')
+		? { image: value.slice('upload:'.length) }
+		: { icon: value };
+	const res = await fetch(target, {
+		method: 'POST',
+		headers: { 'Content-Type': 'application/json' },
+		body: JSON.stringify(body)
+	});
+	return res.ok ? (await res.json()).icon : undefined;
+}