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/catalog-items-loader.ts

@@ -1,7 +1,7 @@
 import { promises as fs } from "node:fs";
 import { asc, sql } from "drizzle-orm";
 import { numericValue } from "@/features/catalog/domain/offer-input";
-import { CatalogPages, db } from "@/lib/db";
+import { CatalogPages, db, queryRows } from "@/lib/db";
 import { getFurnitureDataPath } from "@/lib/services/furni-data";
 import { getHabboGamedataHotel } from "@/lib/services/habbo-gamedata-hotel";
 
@@ -140,12 +140,12 @@ export async function loadCatalogItemsData(
 	// Load items via raw query to work around pageId Int vs VARCHAR mismatch
 	const pageIdStr = String(pageId);
 	// CAST: live Habbo DBs often store page_id as VARCHAR while schema maps Int.
-	const [rawItems] = (await db.execute(sql`
+	const rawItems = await queryRows<Record<string, unknown>>(sql`
     SELECT * FROM catalog_items
     WHERE CAST(page_id AS CHAR) = ${pageIdStr}
     ORDER BY order_number ASC, id ASC
-  `)) as unknown as [Record<string, unknown>[], unknown[]];
-	const items: RawItem[] = rawItems.map((r: Record<string, unknown>) => ({
+  `);
+	const items: RawItem[] = rawItems.map((r) => ({
 		id: Number(r.id),
 		itemIds: String(r.item_ids ?? ""),
 		pageId: numericValue(r.page_id, 0),
@@ -169,14 +169,9 @@ export async function loadCatalogItemsData(
 			.select({ id: CatalogPages.id, caption: CatalogPages.caption })
 			.from(CatalogPages)
 			.orderBy(asc(CatalogPages.caption)),
-		db
-			.execute(sql`
+		queryRows<{ interaction_type: string }>(sql`
       SELECT DISTINCT interaction_type FROM items_base ORDER BY interaction_type ASC
-    `)
-			.then(
-				(result) =>
-					(result as unknown as [{ interaction_type: string }[], unknown[]])[0],
-			),
+    `),
 		getHabboGamedataHotel(),
 	]);
 
@@ -199,9 +194,9 @@ export async function loadCatalogItemsData(
 
 	// Raw query to work around ENUM('0','1') columns returning numeric values.
 	// baseItemIds is built from numeric splits + filter(n > 0); joined via sql.join.
-	const [baseItemRows] =
+	const baseItemRows =
 		baseItemIds.length > 0
-			? ((await db.execute(sql`
+			? await queryRows<Record<string, unknown>>(sql`
             SELECT id, sprite_id, public_name, item_name, type, width, length,
                    stack_height, allow_stack, allow_sit, allow_lay, allow_walk,
                    allow_gift, allow_trade, allow_recycle, allow_marketplace_sell,
@@ -209,8 +204,8 @@ export async function loadCatalogItemsData(
                    vending_ids, customparams, effect_id_male, effect_id_female,
                    clothing_on_walk
             FROM items_base WHERE id IN (${sql.join(baseItemIds, sql`, `)})
-          `)) as unknown as [Record<string, unknown>[], unknown[]])
-			: [[], []];
+          `)
+			: [];
 
 	const baseItems: BaseItem[] = baseItemRows.map((r) => ({
 		id: Number(r.id),