feat(tooling): add lint-staged with Prettier + ESLint on pre-commit

- Install prettier, lint-staged, eslint-config-prettier
- Configure lint-staged in package.json: Prettier write on staged files, ESLint check on .ts/.html
- Add eslint-config-prettier to .eslintrc.json extends to disable formatting rules that conflict with Prettier
- Configure no-unused-vars to allow _ prefix (intentional destructuring pattern)
- Replace manual prettier/git update-index lines in pre-commit hook with npx lint-staged
- Fix pre-existing ESLint errors: remove unused imports in herowars-guildraid, fix useless escapes in middleware.ts, fix eslint-disable comment in utilityTypes.ts

src/middleware.ts

@@ -1,34 +1,34 @@
-import { NextRequest, NextResponse } from "next/server";
-import { getSession } from "./utils/auth/session";
+import { NextRequest, NextResponse } from 'next/server';
+import { getSession } from './utils/auth/session';
 
 export const config = {
-  matcher: ["/((?!api|_next/static|_next/image|.*\\.png$).*)"],
+    matcher: ['/((?!api|_next/static|_next/image|.*\\.png$).*)'],
 };
 
 const publicRoutes = [
-  /^\/article\/[^\/]+?\/?$/, // /article/sample-slug
-  /^\/login\/?$/,
-  /^\/profile\/[^\/]+?\/?$/, // /profile/sample-username
-  /^\/profile\/[^\/]+?\/favorites\/?$/, // /profile/sample-username/favorites
-  /^\/register\/?$/,
-  /^\/$/,
+    /^\/article\/[^/]+?\/?$/, // /article/sample-slug
+    /^\/login\/?$/,
+    /^\/profile\/[^/]+?\/?$/, // /profile/sample-username
+    /^\/profile\/[^/]+?\/favorites\/?$/, // /profile/sample-username/favorites
+    /^\/register\/?$/,
+    /^\/$/,
 ] as const;
 
 const isPublicRoutes = (pathname: string) => {
-  return publicRoutes.some((route) => route.test(pathname));
+    return publicRoutes.some((route) => route.test(pathname));
 };
 
 const isPrivateRoutes = (pathname: string) => {
-  return !isPublicRoutes(pathname);
+    return !isPublicRoutes(pathname);
 };
 
 const middleware = async (req: NextRequest) => {
-  const session = await getSession();
-  if (isPrivateRoutes(req.nextUrl.pathname) && session == null) {
-    return NextResponse.redirect(new URL("/login", req.nextUrl));
-  }
+    const session = await getSession();
+    if (isPrivateRoutes(req.nextUrl.pathname) && session == null) {
+        return NextResponse.redirect(new URL('/login', req.nextUrl));
+    }
 
-  return NextResponse.next();
+    return NextResponse.next();
 };
 
 export default middleware;