fix: preserve task stop intent and guard remote execution boundaries

frontend/src/components/assistant-editor/background-task-panel.tsx

@@ -76,7 +76,8 @@ export function BackgroundTaskPanel({ assistantId }: { assistantId: string | nul
     <summary className="cursor-pointer text-xs text-muted-foreground">后台任务 {tasks.length ? `· ${tasks.filter(task => !terminal.has(task.status)).length} 项待处理` : ""}</summary>
     <div className="mt-2 max-h-64 space-y-2 overflow-y-auto">
       {error && <p role="alert" className="text-xs text-destructive">{error}</p>}
-      {tasks.slice(0, 20).map(task => <TaskCard key={task.id} task={task} onChanged={refresh} />)}
+      <p className="text-xs text-muted-foreground">最多显示 100 项，优先显示未结束任务</p>
+      {tasks.map(task => <TaskCard key={task.id} task={task} onChanged={refresh} />)}
     </div>
   </details>;
 }

frontend/src/components/pages/ComponentsToolsPage.tsx

@@ -1047,6 +1047,6 @@ function TaskFields({ form, setForm }: { form: ToolForm; setForm: React.Dispatch
     <Field label="远端工作目录" required><Input value={form.directory} placeholder="/workspace/my-project" onChange={e => setForm(v => ({ ...v, directory: e.target.value }))} /></Field>
     <Field label="用户名"><Input value={form.username} onChange={e => setForm(v => ({ ...v, username: e.target.value }))} /></Field>
     <Field label="服务密码"><Input type="password" autoComplete="new-password" value={form.password} onChange={e => setForm(v => ({ ...v, password: e.target.value }))} /><span className="text-xs text-muted-foreground">对应 OPENCODE_SERVER_PASSWORD；编辑时留空保留原密码。</span></Field>
-    <Field label="任务时限（秒）"><Input type="number" min={30} max={7200} value={form.timeoutSeconds} onChange={e => setForm(v => ({ ...v, timeoutSeconds: e.target.value }))} /></Field>
+    <Field label="等待时限（秒）"><Input type="number" min={30} max={7200} value={form.timeoutSeconds} onChange={e => setForm(v => ({ ...v, timeoutSeconds: e.target.value }))} /><p className="text-xs text-muted-foreground">含排队时间；重启或重新观察任务后重新计时。</p></Field>
   </div>;
 }