feat(voice): reconcile preview and settings with main

add the shared Voice Preview and Settings panel with browser-local preview
and inactivity preferences, keyboard controls and responsive positioning

preserve main’s Rotation and Context behavior, clarify panel routing and
refresh schema pins within the unchanged prompt limit

src/standalone/tools.js

@@ -19,6 +19,7 @@ export function createStandaloneTools(options) {
     ...options,
     voice: {
       supportedProviders: ['openai', 'gemini'],
+      panel: true,
       toolCatalog: loadToolCatalog,
       ...options?.voice,
     },