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/frontend/src/lib/hooks/use-config.ts

@@ -1,4 +1,4 @@
-import { useState, useEffect } from "react";
+import { useEffect, useState } from "react";
 import { configApi } from "@/lib/api";
 
 export interface AppConfig {