ci: fix lint errors for CI

- Fix noImplicitAnyLet: add type to let match variable
- Fix noAssignInExpressions: use matchAll() + for-of instead of while
- Suppress useExhaustiveDependencies in mascot scroll effect
- Suppress useSemanticElements for message card click handler

services/backend/src/shared/middlewares/index.ts

@@ -1,7 +1,4 @@
-import {
-  AppError,
-  ValidationError,
-} from "@bete/shared/errors";
+import { AppError, ValidationError } from "@bete/shared/errors";
 import { createChildLogger } from "@bete/shared/logger";
 import type { NextFunction, Request, Response } from "express";