refactor(db): typed query helpers, shared test FormData helper

Replace raw db.execute tuple casts with queryRows/rowsFrom/execResult/
affectedRows helpers from lib/db, drop redundant mysql2 casts on typed
query builders, and centralize per-test fakeForm into test/fake-form.
Update db mocks in tests so helpers resolve against mocked execute.

src/lib/services/furniture-inspection.ts

@@ -1,7 +1,7 @@
 import { promises as fs } from "node:fs";
 import path from "node:path";
 import { sql } from "drizzle-orm";
-import { db } from "@/lib/db";
+import { queryRows } from "@/lib/db";
 import { normalizeClassname } from "@/lib/furni/classname";
 import type { FurnitureInspection } from "@/lib/furni/studio-inspection";
 import { getFurniAssetDirs } from "@/lib/services/furni-asset-dirs";
@@ -42,18 +42,16 @@ export async function inspectFurniture(
 		names.map((name) => sql`${normalizeClassname(name)}`),
 		sql`, `,
 	);
-	const [rows] = (await db.execute(
+	const rows = await queryRows<
+		FurnitureInspection["sql"][number] & { classname: string }
+	>(
 		sql`SELECT id, sprite_id AS spriteId, item_name AS classname, public_name AS name, type FROM items_base WHERE LOWER(TRIM(item_name)) IN (${namesSql})`,
-	)) as unknown as [
-		Array<FurnitureInspection["sql"][number] & { classname: string }>,
-		unknown,
-	];
-	const [offers] = (await db.execute(
+	);
+	const offers = await queryRows<
+		FurnitureInspection["catalog"][number] & { classname: string }
+	>(
 		sql`SELECT ib.item_name AS classname, ci.id, ci.page_id AS pageId, ci.cost_credits AS credits, ci.cost_points AS points FROM items_base ib JOIN catalog_items ci ON FIND_IN_SET(ib.id, REPLACE(ci.item_ids, ';', ',')) > 0 WHERE LOWER(TRIM(ib.item_name)) IN (${namesSql})`,
-	)) as unknown as [
-		Array<FurnitureInspection["catalog"][number] & { classname: string }>,
-		unknown,
-	];
+	);
 	let readable = true;
 	let data: Record<string, unknown> = {};
 	try {