feat: auto interaction detection from real furniture data

Replace classname/name keyword guessing with real data so sit/lay/stand
has zero false positives:
- autoDetectInteraction() now accepts real flags (cansiton/canlayon/
  canstandon), logicType, and animation-state count; real data wins and
  keywords are only a fallback when no real data exists.
- New furni-real-interaction helper reads the local FurnitureData.json
  (highest-revision entries win; a true flag in any duplicate is kept)
  and falls back to the official Habbo furnidata.
- interaction_modes_count now uses emulator conventions: dice=6,
  gate/teleport=2, roller=1, generic multistate = animation-state count,
  chairs/beds=1, plain items=0.
- verifyAndFixInteractionModesCount only touches items with real data
  and skips everything else (no keyword overwrites).
- parseNitroBundle falls back to gunzip for gzip-compressed .nitro files.
- Wired through furni-import, upload-import, clone-import, and the nitro
  editor auto-detect button.

src/app/admin/import/furni/nitro-editor-dialog.tsx

@@ -35,6 +35,7 @@ import { adminFetch } from "@/lib/admin-fetch";
 import {
 	autoDetectInteraction,
 	getInteractionTypeLabel,
+	nitroAnimationStatesCount,
 } from "@/lib/furni/auto-interaction";
 
 interface NitroEditorDialogProps {
@@ -154,7 +155,20 @@ export function NitroEditorDialog({
 	const [jsonError, setJsonError] = useState<string | null>(null);
 
 	const handleAutoDetect = () => {
-		const result = autoDetectInteraction(classname, name);
+		// Use real data when available: the DB flags for this item plus the
+		// .nitro animation states already loaded in the editor. Keyword
+		// detection only kicks in when neither is present — no false positives.
+		const nitroJson =
+			metadata && typeof metadata === "object"
+				? (metadata as Record<string, unknown>)
+				: null;
+		const result = autoDetectInteraction(classname, name, {
+			cansiton: flags.cansiton,
+			canlayon: flags.canlayon,
+			canstandon: flags.canstandon,
+			logicType: nitroJson?.logicType as string | undefined,
+			animationStates: nitroAnimationStatesCount(nitroJson),
+		});
 		setAutoDetectResult(result);
 		setFlags({
 			canstandon: result.canStand,

src/lib/services/clone-import.ts

@@ -16,6 +16,7 @@ import {
 	ensureDirectories,
 	getOrCreateCategoryPage,
 } from "@/lib/services/furni-import";
+import { nitroAnimationStatesCount } from "@/lib/services/furni-real-interaction";
 import { browserHeaders } from "@/lib/services/import/core/browser-headers";
 import {
 	curlDownload,
@@ -314,8 +315,12 @@ export async function cloneSingleFurni(params: {
 		}
 	}
 	// Validate it is a real Nitro bundle.
+	let clonedNitroJson: Record<string, unknown> | null = null;
 	try {
-		parseNitroBundle(await fs.readFile(/*turbopackIgnore: true*/ nitroPath));
+		const parsed = parseNitroBundle(
+			await fs.readFile(/*turbopackIgnore: true*/ nitroPath),
+		);
+		clonedNitroJson = parsed.json as Record<string, unknown>;
 	} catch {
 		await fs.unlink(/*turbopackIgnore: true*/ nitroPath).catch(() => {});
 		logger.warn("[clone-import] invalid .nitro bundle for", { classname });
@@ -367,8 +372,16 @@ export async function cloneSingleFurni(params: {
 	// allow_walk = canstandon, allow_sit = cansiton, allow_lay = canlayon.
 	const allowStack = stackHeight > 0 ? "1" : "0";
 
-	// Auto-detect interaction modes count from classname/name
+	// Auto-detect interaction modes count. The source furnidata flags and the
-	const autoInteraction = autoDetectInteraction(classname, entry.name);
+	// cloned .nitro animation states are real data — keyword guessing is only
+	// used when neither is available, so there are no false positives.
+	const autoInteraction = autoDetectInteraction(classname, entry.name, {
+		cansiton: entry.cansiton,
+		canlayon: entry.canlayon,
+		canstandon: entry.canstandon,
+		logicType: (clonedNitroJson?.logicType as string) || undefined,
+		animationStates: nitroAnimationStatesCount(clonedNitroJson),
+	});
 	const interactionModesCount = autoInteraction.interactionModesCount;
 
 	let newId: number;

src/lib/services/swf/nitro-builder.ts

@@ -1,4 +1,4 @@
-import { deflateSync, inflateSync } from "node:zlib";
+import { deflateSync, gunzipSync, inflateSync } from "node:zlib";
 import type { SpriteImage } from "./image-decoder";
 
 // ── Minimal PNG Encoder ────────────────────────────────────────────
@@ -267,7 +267,7 @@ export function parseNitroBundle(buffer: Buffer): {
 	offset += 4;
 	const jsonCompressed = buffer.subarray(offset, offset + jsonCompressedLen);
 	offset += jsonCompressedLen;
-	const jsonStr = inflateSync(jsonCompressed).toString("utf-8");
+	const jsonStr = inflateJsonOrGzip(jsonCompressed).toString("utf-8");
 	const json = JSON.parse(jsonStr);
 
 	// File 2: PNG
@@ -279,7 +279,20 @@ export function parseNitroBundle(buffer: Buffer): {
 	offset += 4;
 	const pngCompressed = buffer.subarray(offset, offset + pngCompressedLen);
 	offset += pngCompressedLen;
-	const png = inflateSync(pngCompressed);
+	const png = inflateJsonOrGzip(pngCompressed);
 
 	return { json, jsonFileName, png, pngFileName };
 }
+
+/**
+ * Some bundled .nitro files (e.g. official /var/www/Gamedata furniture)
+ * gzip their contents instead of raw-deflate. Try inflate first, then fall
+ * back to gunzip so both formats parse.
+ */
+function inflateJsonOrGzip(input: Buffer): Buffer {
+	try {
+		return inflateSync(input);
+	} catch {
+		return gunzipSync(input);
+	}
+}

src/lib/services/upload-import.ts

@@ -15,6 +15,7 @@ import {
 	IMPORTED_PAGE_CAPTION,
 	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";
 
 export interface UploadResult {
@@ -330,8 +331,15 @@ export async function uploadSingleFurni(params: {
 
 	const price = autoPriceFurni(classname);
 
-	// Auto-detect interaction modes count from classname/name
+	// Auto-detect interaction modes count. Real flags + .nitro animation
-	const autoInteraction = autoDetectInteraction(classname, name);
+	// states win over keyword guessing — no false positives.
+	const autoInteraction = autoDetectInteraction(classname, name, {
+		cansiton,
+		canlayon,
+		canstandon,
+		logicType: (nitroMeta?.logicType as string) || undefined,
+		animationStates: nitroAnimationStatesCount(nitroMeta),
+	});
 	const interactionModesCount = autoInteraction.interactionModesCount;
 
 	let newId: number;