feat: 按机器人选择 Agent Preset

在九个渠道的设置页卡片上选择 Host 已有预设；未选则跟随默认，只影响之后新建的会话。

Co-authored-by: Cursor <cursoragent@cursor.com>

plugin-src/client/agent-preset.js

@@ -0,0 +1,101 @@
+import * as React from 'react';
+
+import { h } from './i18n.js';
+
+export const SET_AGENT_PRESET_ENDPOINT = 'bot.preset.set';
+
+const PRESET_ID = /^[a-z0-9][a-z0-9-]*$/;
+
+export const EMPTY_AGENT_PRESET_CATALOG = Object.freeze({
+  defaultId: '',
+  items: Object.freeze([]),
+});
+
+export const AgentPresetCatalogContext = React.createContext(EMPTY_AGENT_PRESET_CATALOG);
+
+export function normalizeAgentPresetId(value) {
+  if (typeof value !== 'string') return '';
+  const id = value.trim();
+  return PRESET_ID.test(id) ? id : '';
+}
+
+export function normalizeAgentPresetCatalog(value) {
+  if (!value || typeof value !== 'object' || Array.isArray(value)) {
+    return { defaultId: '', items: [] };
+  }
+  const items = [];
+  const seen = new Set();
+  for (const entry of Array.isArray(value.items) ? value.items : []) {
+    const id = typeof entry === 'string'
+      ? normalizeAgentPresetId(entry)
+      : normalizeAgentPresetId(entry?.id);
+    if (!id || seen.has(id)) continue;
+    seen.add(id);
+    const label = typeof entry?.label === 'string' && entry.label.trim()
+      ? entry.label.trim().slice(0, 128)
+      : typeof entry?.name === 'string' && entry.name.trim()
+        ? entry.name.trim().slice(0, 128)
+        : id;
+    items.push({ id, label });
+  }
+  return {
+    defaultId: normalizeAgentPresetId(value.defaultId),
+    items,
+  };
+}
+
+export function AgentPresetEditor({ agentPreset = '', disabled = false, onSave }) {
+  const catalog = React.useContext(AgentPresetCatalogContext) ?? EMPTY_AGENT_PRESET_CATALOG;
+  const current = normalizeAgentPresetId(agentPreset);
+  const [saving, setSaving] = React.useState(false);
+  const [error, setError] = React.useState(null);
+
+  const items = [];
+  const seen = new Set();
+  for (const item of Array.isArray(catalog.items) ? catalog.items : []) {
+    if (!item?.id || seen.has(item.id)) continue;
+    seen.add(item.id);
+    items.push(item);
+  }
+  if (current && !seen.has(current)) {
+    items.push({ id: current, label: current });
+  }
+
+  const inheritLabel = '跟随 Host 默认';
+
+  const change = async (event) => {
+    const next = event.target.value;
+    if (next === current || saving || disabled) return;
+    setSaving(true);
+    setError(null);
+    try {
+      await onSave?.(next || null);
+    } catch (cause) {
+      setError(cause?.message ?? 'Agent Preset 修改失败，请重试。');
+    } finally {
+      setSaving(false);
+    }
+  };
+
+  return h('div', { className: 'dim-preset' },
+    h('div', { className: 'dim-presetHeader' },
+      h('span', null, 'Agent Preset'),
+      saving ? h('span', { className: 'dim-presetStatus' }, '保存中…') : null),
+    React.createElement('select', {
+      className: 'dim-presetSelect',
+      value: current,
+      disabled: disabled || saving,
+      'aria-label': 'Agent Preset',
+      onChange: (event) => { void change(event); },
+    },
+      h('option', { value: '' }, inheritLabel),
+      ...items.map((item) => h(
+        'option',
+        { key: item.id, value: item.id },
+        item.label && item.label !== item.id ? `${item.label}（${item.id}）` : item.id,
+      )),
+    ),
+    h('small', { className: 'dim-presetHelp' }, '只影响之后新建的会话。'),
+    error ? h('p', { className: 'dim-presetError', role: 'alert' }, error) : null,
+  );
+}