fix: 搜索防抖、防止旧结果覆盖新搜索、修复 Windows 假失焦#1252
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- SearchInput 添加 200ms 防抖，减少频繁查库 - useHistoryList 添加 fetchId 机制，丢弃过期请求结果，防止旧结果覆盖新搜索 - useHistoryList 添加 pendingReload，查询中途触发新搜索时自动接力 - useTauriFocus 添加 isFocused() 二次确认，缓解 Windows 上假失焦导致的 hideWindow/autoClear 相关 issues：EcoPasteHub#524 EcoPasteHub#882 EcoPasteHub#966
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概述
修复搜索历史记录时的三个问题：频繁查库卡顿、旧搜索结果覆盖新搜索、Windows 上假失焦导致窗口消失/搜索框清空。
问题 1：搜索无防抖
每个按键都立即触发一次数据库查询，快速输入时造成多次无意义的全表扫描。
修复：SearchInput 添加 200ms 防抖。
问题 2：旧搜索结果覆盖新搜索
用户快速输入时，先发出的查询可能晚于后发的查询返回，导致列表显示旧结果（视觉上"搜索回退"）。
修复：
fetchId机制，每次查询递增 ID，返回时比对是否仍是最新请求queryKey比对，确保结果对应当前搜索条件pendingReload，查询中途触发新搜索时自动接力问题 3：Windows 假失焦
Windows 上
onFocusChanged偶尔会发出错误的失焦事件，触发hideWindow()隐藏窗口和autoClear清空搜索框。修复：
useTauriFocus在收到失焦事件后，用appWindow.isFocused()二次确认，减少误触发。相关 issues：#524 #882 #966