feat(browser): 浏览器插件行补「入口」开关（可固定设置页一级导航）

apps/desktop/src/main/plugins/plugin-host.ts

@@ -362,7 +362,8 @@ class PluginHost {
   /** 设置入口是否固定到设置页一级导航（仅声明了设置表单的插件可开） */
   async setSettingsNav(id: string, on: boolean): Promise<void> {
     const plugin = this.resolved.get(id)
-    if (!plugin || !this.settingsSchemas.has(id)) return
+    // 可固定入口 = 声明了设置表单，或内置插件带宿主专属设置页（如浏览器）
+    if (!plugin || (!this.settingsSchemas.has(id) && !this.builtinSettingsPage(id))) return
     log.info('set settings nav', { pluginId: id, on })
     if (on) this.settingsNavSet.add(id)
     else this.settingsNavSet.delete(id)
@@ -467,6 +468,11 @@ class PluginHost {
     return !this.disabled.has(id)
   }
 
+  /** 内置插件是否带宿主专属二级设置页（不走声明式表单，设置页特判渲染） */
+  private builtinSettingsPage(id: string): boolean {
+    return BUILTIN_PLUGINS.some((b) => b.manifest.id === id && b.settingsPage === true)
+  }
+
   list(): PluginInfo[] {
     return [...this.resolved.values()]
       .map((p) => ({
@@ -478,8 +484,13 @@ class PluginHost {
         hasPage: Boolean(p.source === 'external' && p.manifest.entry?.page),
         hasComponent: Boolean(p.componentKey),
         hasRenderer: Boolean(p.source === 'external' && p.manifest.entry?.renderer),
-        hasSettings: (this.settingsSchemas.get(p.manifest.id)?.items.length ?? 0) > 0,
-        settingsNav: this.settingsNavSet.has(p.manifest.id) && (this.settingsSchemas.get(p.manifest.id)?.items.length ?? 0) > 0,
+        hasSettings:
+          (this.settingsSchemas.get(p.manifest.id)?.items.length ?? 0) > 0 ||
+          this.builtinSettingsPage(p.manifest.id),
+        settingsNav:
+          this.settingsNavSet.has(p.manifest.id) &&
+          ((this.settingsSchemas.get(p.manifest.id)?.items.length ?? 0) > 0 ||
+            this.builtinSettingsPage(p.manifest.id)),
         dependencies: this.depStatus(p),
         storageSchema: this.storageSchemas.get(p.manifest.id),
         error: p.error