feat(nitro): normalise hotel and uploaded bundles to WebP Lossless

Importing from a hotel wrote the downloaded .nitro to disk untouched, so
official PNG textures stayed PNG and only SWF imports ended up as WebP.
Every Studio import should produce the same format regardless of where the
bytes came from, so both clone and upload paths now run the bundle through
toWebpLosslessBundle.

The helper decodes the texture and re-encodes it with the same VP8L options
the SWF importer uses, so the artwork round-trips bit-for-bit, and lets
createNitroBundle relabel the member and repair the meta.image pointer. A
bundle that is already lossless WebP is returned untouched, making the
operation idempotent and safe to run on re-import. A colour variant that
shares a library keeps the member base name it arrived with.

A texture that cannot be decoded keeps its original format with a warning
instead of failing the import: the bundle is valid, and losing a furniture
item over a codec edge case is worse than a slightly larger texture.

src/lib/services/clone-import.ts

@@ -24,7 +24,10 @@ import {
 } from "@/lib/services/import/core/curl-fetch";
 import { downloadFile } from "@/lib/services/import/core/download";
 import { siteSettings } from "@/lib/services/site-settings";
-import { parseNitroBundle } from "@/lib/services/swf/nitro-builder";
+import {
+	parseNitroBundle,
+	toWebpLosslessBundle,
+} from "@/lib/services/swf/nitro-builder";
 import { getRuntimePath } from "@/lib/utils/runtime-path";
 
 export interface SourceFurni {
@@ -331,6 +334,22 @@ export async function cloneSingleFurni(params: {
 		logger.warn("[clone-import] invalid .nitro bundle for", { classname });
 		return { ok: false, classname, warnings, error: "invalid .nitro bundle" };
 	}
+	// Hotels ship PNG textures, so normalise every clone to WebP Lossless and
+	// make it match the SWF importer. A texture that will not re-encode is
+	// kept as it arrived rather than failing the whole import — the bundle is
+	// valid, and losing the furniture over a codec edge case is worse.
+	try {
+		const converted = await toWebpLosslessBundle(
+			await fs.readFile(/*turbopackIgnore: true*/ nitroPath),
+		);
+		await fs.writeFile(/*turbopackIgnore: true*/ nitroPath, converted);
+	} catch (err) {
+		warnings.push("texture kept in its original format");
+		logger.warn("[clone-import] WebP normalisation failed for", {
+			classname,
+			err,
+		});
+	}
 	let iconDl: { ok: boolean; size: number };
 	if (source.iconBaseUrl) {
 		iconDl = await downloadFile(