feat(cms): recover drafts and failed imports with verified UI workflows

src/lib/services/furni-import.ts

@@ -20,6 +20,7 @@ import {
 	getFurnitureDataWritePaths,
 	removeFurniEntry,
 } from "@/lib/services/furni-data";
+import { diagnosticAssetUrl } from "@/lib/services/furniture-source-assets";
 import {
 	lookupOfficialHabboFurni,
 	type OfficialHabboFurniEntry,
@@ -707,6 +708,7 @@ export async function importSingleFurni(params: {
 			? Promise.resolve(true)
 			: tryDownloadCandidates(iconUrls, iconPath, "png", (detail) => {
 					iconFailure = detail;
+					warnings.push(`Icon download failed: ${detail}`);
 				}),
 		params.providedNitro || (params.preserveAssets && existsSync(nitroPath))
 			? Promise.resolve(false)
@@ -714,6 +716,7 @@ export async function importSingleFurni(params: {
 				? Promise.resolve(true)
 				: tryDownloadCandidates(swfUrls, swfPath, "swf", (detail) => {
 						swfFailure = detail;
+						warnings.push(`SWF download failed: ${detail}`);
 					}),
 	]);
 	let iconOk = iconOkResult;
@@ -729,6 +732,10 @@ export async function importSingleFurni(params: {
 		const nitroUrl = `${sourceNitroBaseUrl}/${encodeURIComponent(safeNitroName)}.nitro`;
 		const dl = await downloadFile(nitroUrl, nitroPath, { validate: "nitro" });
 		if (dl.ok) nitroDownloadOk = true;
+		else
+			warnings.push(
+				`Nitro download failed: ${diagnosticAssetUrl(nitroUrl)}: ${dl.error ?? "unknown cause"}`,
+			);
 	}
 
 	// ── Icon fallback: extract from SWF if download failed ────────────