fix(i18n): 崩溃兜底页不再停留旧语言

ErrorBoundary / PanelErrorBoundary 是 class 组件（拥有错误生命周期），
不能用 hook 订阅 settings store；根边界还是 App 的父级，语言切换时
App 的重渲染传导不到它——崩溃兜底页因此停留在启动时的语言，恰好是
用户最需要读得懂的一屏。

修法：导出改为一层薄函数包装（订阅 language 传 prop），class 内部经
tFor(language, …) 翻译。错误边界行为不变（边界仍是 class、仍在
children 之上）。使用方（main.tsx / TerminalPanel）无需改动。

ROADMAP 已知待办补录两项 i18n 质量专项：zh-TW 用语统一（命令/指令、
口令/密碼 等）、ja 片假名长音符号统一（フォルダ/フォルダー）。

docs/ROADMAP.md

@@ -162,6 +162,8 @@
 - [x] ~~布局塌陷~~（v0.2.1 修复：antd `<App>` 包裹层 `.ant-app` 无高度导致百分比高度链断裂）
 - [x] ~~关闭标签页整窗崩溃~~（v0.2.1 修复：xterm IDisposable 对象被当函数调用；并新增 ErrorBoundary 兜底 + 渲染层报错转发主进程日志）
 - [x] ~~首启动空屏~~（v0.2.1：启动自动打开一个终端）
+- [ ] zh-TW 用语统一（i18n 质量专项）：`命令/指令` 全文件混用（panels/ssh/settings/terminal，台湾惯用「指令」）、`口令`→`密碼`（ssh.secret.passphrase）、顺带通读 服务器→伺服器 / 默认→預設 / 网络→網路 / 软件→軟體。需要一次全局连贯的专项，零散改会制造新的不一致
+- [ ] ja 片假名长音符号统一：`フォルダ`(6) / `フォルダー`(7) 混用，二选一全局统一
 - [ ] autoWrap=false 的固定列宽模式（xterm.js 无原生 wrapMode，需自定义列数控制）
 - [ ] 终端标题跟随 OSC 序列（窗格标题显示当前目录/命令）
 - [ ] 内置等宽字体打包（OFL 许可：JetBrains Mono / Fira Code 等）

src/renderer/src/ErrorBoundary.tsx

@@ -1,6 +1,7 @@
 import { Component } from 'react'
 import type { ErrorInfo, ReactNode } from 'react'
-import { t } from '@shared/i18n'
+import { DEFAULT_LANGUAGE, tFor, type Language } from '@shared/i18n'
+import { useSettingsStore } from './settings/store'
 
 interface ErrorBoundaryProps {
   children: ReactNode
@@ -11,10 +12,29 @@ interface ErrorBoundaryState {
 }
 
 /**
- * Last-resort boundary: a render/effect crash must never take the whole app
- * down to a black window. Shows the error and a reload escape instead.
+ * Error boundaries must stay class components (they own the error lifecycle),
+ * and class components cannot subscribe to the settings store the way function
+ * components do — nor do they re-render when App re-renders on a language
+ * switch (the root boundary is App's *parent*). So the exported boundaries are
+ * thin function wrappers that subscribe to the language and hand it down as a
+ * prop; the classes translate through `tFor(language, …)`. Without this, a
+ * crashed panel showed its fallback screen in whatever language the app was
+ * launched in — the one screen where reading it matters most.
  */
-export class ErrorBoundary extends Component<ErrorBoundaryProps, ErrorBoundaryState> {
+function useBoundaryLanguage(): Language {
+  return useSettingsStore((s) => s.settings.system.language ?? DEFAULT_LANGUAGE)
+}
+
+/** Last-resort boundary: a render/effect crash must never take the whole app
+ *  down to a black window. Shows the error and a reload escape instead. */
+export function ErrorBoundary(props: ErrorBoundaryProps): ReactNode {
+  const language = useBoundaryLanguage()
+  return <ErrorBoundaryClass {...props} language={language} />
+}
+
+type ErrorBoundaryClassProps = ErrorBoundaryProps & { language: Language }
+
+class ErrorBoundaryClass extends Component<ErrorBoundaryClassProps, ErrorBoundaryState> {
   state: ErrorBoundaryState = { error: null }
 
   static getDerivedStateFromError(error: Error): ErrorBoundaryState {
@@ -39,7 +59,7 @@ export class ErrorBoundary extends Component<ErrorBoundaryProps, ErrorBoundarySt
             color: '#cccccc'
           }}
         >
-          <div>{t('workspace.error.title')}</div>
+          <div>{tFor(this.props.language, 'workspace.error.title')}</div>
           <pre
             style={{
               maxWidth: 720,
@@ -57,7 +77,7 @@ export class ErrorBoundary extends Component<ErrorBoundaryProps, ErrorBoundarySt
             onClick={() => window.location.reload()}
             style={{ padding: '6px 18px', cursor: 'pointer' }}
           >
-            {t('workspace.error.reload')}
+            {tFor(this.props.language, 'workspace.error.reload')}
           </button>
         </div>
       )
@@ -78,7 +98,14 @@ interface PanelErrorBoundaryProps {
  * other live session. A crashed pane is replaced in place and can be remounted
  * on retry; the rest of the workspace is untouched.
  */
-export class PanelErrorBoundary extends Component<PanelErrorBoundaryProps, ErrorBoundaryState> {
+export function PanelErrorBoundary(props: PanelErrorBoundaryProps): ReactNode {
+  const language = useBoundaryLanguage()
+  return <PanelErrorBoundaryClass {...props} language={language} />
+}
+
+type PanelErrorBoundaryClassProps = PanelErrorBoundaryProps & { language: Language }
+
+class PanelErrorBoundaryClass extends Component<PanelErrorBoundaryClassProps, ErrorBoundaryState> {
   state: ErrorBoundaryState = { error: null }
 
   static getDerivedStateFromError(error: Error): ErrorBoundaryState {
@@ -98,10 +125,12 @@ export class PanelErrorBoundary extends Component<PanelErrorBoundaryProps, Error
     if (!this.state.error) return this.props.children
     return (
       <div className="panel-error">
-        <div className="panel-error-title">{this.props.label ?? t('workspace.error.panelTitle')}</div>
+        <div className="panel-error-title">
+          {this.props.label ?? tFor(this.props.language, 'workspace.error.panelTitle')}
+        </div>
         <pre className="panel-error-message">{this.state.error.message}</pre>
         <button type="button" className="panel-error-retry" onClick={this.retry}>
-          {t('workspace.error.panelRetry')}
+          {tFor(this.props.language, 'workspace.error.panelRetry')}
         </button>
       </div>
     )