fix(nitro): normalise uploaded bundles so meta.image matches the texture

An uploaded .nitro was written to disk byte-for-byte, so a bundle from a
third-party tool that ships a WebP member while still pointing
spritesheet.meta.image at a .png was accepted and stored as-is. The client
resolves the spritesheet through that pointer, so the result was a file
that validates fine and then renders nothing.

Re-write the bundle through createNitroBundle on import, which labels the
member from the actual bytes and repairs the pointer. No texture is
re-encoded, so the bytes stay identical, and the member keeps the base
name it arrived with so `chair*2` colour variants that share the `chair`
library are not renamed.

src/lib/services/upload-import.ts

@@ -17,7 +17,10 @@ import {
 	IMPORTED_PAGE_CAPTION_SAVE,
 } from "@/lib/services/furni-import";
 import { nitroAnimationStatesCount } from "@/lib/services/furni-real-interaction";
-import { parseNitroBundle } from "@/lib/services/swf/nitro-builder";
+import {
+	createNitroBundle,
+	parseNitroBundle,
+} from "@/lib/services/swf/nitro-builder";
 import { getRuntimePath, getRuntimeResolve } from "@/lib/utils/runtime-path";
 
 export interface UploadResult {
@@ -275,9 +278,19 @@ export async function uploadSingleFurni(params: {
 	}
 
 	let nitroMeta: Record<string, unknown> | null = null;
+	// The client resolves the spritesheet through `spritesheet.meta.image`, so
+	// that pointer must name the member we actually ship. A bundle from a
+	// third-party tool can arrive with a stale pointer (say `.png` next to a
+	// WebP member), which stores fine and then renders nothing. Re-writing
+	// through the builder repairs it without touching a single texture byte.
+	// The member keeps its own base name, so `chair*2` colour variants that
+	// share the `chair` library are not renamed.
+	let storedNitro = nitroBuffer;
 	try {
 		const parsed = parseNitroBundle(nitroBuffer);
 		nitroMeta = parsed.json;
+		const memberBase = parsed.textureFileName.replace(/\.(?:png|webp)$/i, "");
+		storedNitro = createNitroBundle(parsed.json, parsed.texture, memberBase);
 	} catch {
 		return { ok: false, classname, warnings, error: "invalid .nitro bundle" };
 	}
@@ -299,7 +312,7 @@ export async function uploadSingleFurni(params: {
 			error: ".nitro file already exists on disk",
 		};
 	}
-	await fs.writeFile(nitroPath, nitroBuffer);
+	await fs.writeFile(nitroPath, storedNitro);
 
 	let iconFileName: string | null = null;
 	let iconPath: string | null = null;