feat(theme): complete Minecraft overhaul for all pages including admin/utility

frontend/src/app/backend-logs/page.tsx

@@ -6,6 +6,7 @@ import { useEffect, useState } from "react";
 import { apiFetch } from "@/lib/api";
 import { readToken } from "@/lib/auth";
 import { useI18nText } from "@/lib/i18n";
+import { Activity, AlertCircle, List, Play, RefreshCw, Server, Trash2, Zap } from "lucide-react";
 
 type BackendLogItem = {
   id: number;
@@ -277,7 +278,8 @@ export default function BackendLogsPage() {
   return (
     <main className="mx-auto max-w-7xl px-3 py-6 max-[390px]:px-2 sm:px-4 md:px-6 md:py-8">
       <div className="flex flex-wrap items-center justify-between gap-3">
-        <h1 className="text-xl font-semibold max-[390px]:text-lg sm:text-2xl">
+        <h1 className="text-xl font-semibold max-[390px]:text-lg sm:text-2xl flex items-center gap-2">
+          <Server size={24} />
           {tx("后台日志（题解异步队列）", "Backend Logs (Async Solution Queue)")}
         </h1>
         <div className="flex w-full flex-wrap items-center gap-2 text-sm sm:w-auto sm:justify-end">
@@ -288,10 +290,11 @@ export default function BackendLogsPage() {
             {tx("缺失答案题目", "Problems missing answers")} {missingProblems}
           </span>
           <button
-            className="rounded border px-3 py-1 disabled:opacity-50"
+            className="rounded border px-3 py-1 disabled:opacity-50 flex items-center gap-1"
             onClick={() => void triggerMissingSolutions()}
             disabled={triggerLoading}
           >
+            <Zap size={14} />
             {triggerLoading ? tx("手动补全中...", "Triggering...") : tx("手动补全（可选）", "Manual fill (optional)")}
           </button>
           <select
@@ -303,7 +306,8 @@ export default function BackendLogsPage() {
             <option value={100}>{tx("最近 100 条", "Latest 100")}</option>
             <option value={200}>{tx("最近 200 条", "Latest 200")}</option>
           </select>
-          <button className="rounded border px-3 py-1 sm:ml-auto" onClick={() => void refresh()} disabled={loading}>
+          <button className="rounded border px-3 py-1 sm:ml-auto flex items-center gap-1" onClick={() => void refresh()} disabled={loading}>
+            <RefreshCw size={14} className={loading ? "animate-spin" : ""} />
             {tx("刷新", "Refresh")}
           </button>
         </div>
@@ -401,7 +405,10 @@ export default function BackendLogsPage() {
 
       <section className="mt-4 grid gap-3 md:grid-cols-2">
         <article className="rounded-xl border bg-white p-3">
-          <h2 className="text-sm font-medium">{tx("正在处理（Running）", "Running Jobs")}</h2>
+          <h2 className="text-sm font-medium flex items-center gap-2">
+            <Activity size={16} className="text-emerald-600" />
+            {tx("正在处理（Running）", "Running Jobs")}
+          </h2>
           <p className="mt-1 text-xs text-zinc-600">
             {tx("当前题目 ID：", "Current problem IDs:")}
             {runningIds.length ? runningIds.join(", ") : tx("无", "None")}
@@ -423,7 +430,10 @@ export default function BackendLogsPage() {
         </article>
 
         <article className="rounded-xl border bg-white p-3">
-          <h2 className="text-sm font-medium">{tx("待处理队列（Queued）", "Queued Jobs")}</h2>
+          <h2 className="text-sm font-medium flex items-center gap-2">
+            <List size={16} className="text-amber-600" />
+            {tx("待处理队列（Queued）", "Queued Jobs")}
+          </h2>
           <p className="mt-1 text-xs text-zinc-600">
             {tx("待处理题目 ID（预览）：", "Queued problem IDs (preview):")}
             {queuedIds.length ? queuedIds.join(", ") : tx("无", "None")}