/**
 * Main thread Worker host — thin shim that keeps UI responsive.
 *
 * Responsibilities:
 *   1. Create Worker and proxy mailxapi calls to it
 *   2. Proxy TCP calls from Worker to msgapi.tcp (C# native bridge)
 *   3. Proxy native bridge calls (OAuth, device info)
 *   4. Forward events from Worker to UI event handlers
 *   5. Set up visibilitychange/periodic sync triggers
 *
 * The UI code (api-client.ts) calls window.mailxapi.* exactly as before —
 * this host just routes those calls to the Worker instead of running them inline.
 */
export {};
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