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/features/catalog/server/search.ts

@@ -1,6 +1,6 @@
 import "server-only";
 import { sql } from "drizzle-orm";
-import { db } from "@/lib/db";
+import { queryRows } from "@/lib/db";
 import { type CatalogSearchResult, parseCatalogSearch } from "../domain/search";
 
 const LIMIT = 25;
@@ -29,18 +29,15 @@ export async function searchCatalog(
 	);
 	const number = input.numericId;
 	const [categoryData, furnitureData] = await Promise.all([
-		db.execute(
+		queryRows<PageRow>(
 			sql`SELECT id, caption, parent_id AS parentId FROM ${pages} WHERE caption LIKE ${input.pattern} ESCAPE '=' ${number === null ? sql`` : sql`OR id=${number}`} ORDER BY ${number === null ? sql`id` : sql`CASE WHEN id=${number} THEN 0 ELSE 1 END, id`} LIMIT 12`,
 		),
-		db.execute(
+		queryRows<FurnitureRow>(
 			sql`SELECT id, item_name AS classname, sprite_id AS spriteId FROM items_base WHERE item_name LIKE ${input.pattern} ESCAPE '=' OR public_name LIKE ${input.pattern} ESCAPE '=' ${number === null ? sql`` : sql`OR id=${number} OR sprite_id=${number}`} ORDER BY ${number === null ? sql`id` : sql`CASE WHEN id=${number} THEN 0 ELSE 1 END, id`} LIMIT 25`,
 		),
 	]);
-	const categories = (categoryData[0] as unknown as PageRow[]).slice(0, 12);
-	const furniture = (furnitureData[0] as unknown as FurnitureRow[]).slice(
-		0,
-		LIMIT,
-	);
+	const categories = categoryData.slice(0, 12);
+	const furniture = furnitureData.slice(0, LIMIT);
 	const predicates = [sql`i.catalog_name LIKE ${input.pattern} ESCAPE '='`];
 	if (number !== null) {
 		predicates.push(sql`i.id=${number}`, sql`i.page_id=${String(number)}`);
@@ -51,13 +48,10 @@ export async function searchCatalog(
 		predicates.push(
 			sql`FIND_IN_SET(${String(base.id)}, REPLACE(i.item_ids, ';', ',')) > 0`,
 		);
-	const [offerData] = await db.execute(
+	const offerData = await queryRows<OfferRow>(
 		sql`SELECT i.id, i.catalog_name AS caption, i.page_id AS pageId, i.item_ids AS itemIds, p.caption AS pageCaption, p.parent_id AS parentId FROM ${offers} i INNER JOIN ${pages} p ON p.id=i.page_id WHERE ${sql.join(predicates, sql` OR `)} ORDER BY ${number === null ? sql`i.id` : sql`CASE WHEN i.id=${number} THEN 0 ELSE 1 END, i.id`} LIMIT ${LIMIT - categories.length}`,
 	);
-	const matches = (offerData as unknown as OfferRow[]).slice(
-		0,
-		LIMIT - categories.length,
-	);
+	const matches = offerData.slice(0, LIMIT - categories.length);
 	const pageMap = new Map<number, PageRow>();
 	for (const page of categories)
 		pageMap.set(Number(page.id), {
@@ -79,11 +73,11 @@ export async function searchCatalog(
 			.slice(0, LIMIT);
 		if (!ids.length) break;
 		for (const id of ids) attempted.add(id);
-		const [parents] = await db.execute(
+		const parents = await queryRows<PageRow>(
 			sql`SELECT id, caption, parent_id AS parentId FROM ${pages} WHERE id IN (${sql.join(ids, sql`, `)}) LIMIT 25`,
 		);
 		frontier = [];
-		for (const raw of parents as unknown as PageRow[]) {
+		for (const raw of parents) {
 			const page = {
 				...raw,
 				id: Number(raw.id),