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This PR fixes a browser resource leak in the serverless export service where puppeteer.launch() opened a browser but only the Page handle was returned and eventually closed, leaving the browser process running indefinitely.

• render-serverless.ts: open() now returns { browser, page } instead of just page, and adds a try/catch to close the browser if page initialization fails mid-setup.
• handler.ts: Destructures both handles from open(), wraps performExport in a try/finally that calls browser.close() — which closes all pages and the browser process — guaranteeing cleanup even when the export throws.

Safe to merge — the fix correctly closes both the browser and all its pages in every exit path.

The change is minimal and targeted: the open function now returns the browser handle alongside the page, and the finally block ensures browser.close() is always called regardless of whether the export succeeds or throws. The try/catch inside open handles the case where page initialization itself fails, closing the browser before re-throwing. No new logic paths are introduced that could behave unexpectedly.

No files require special attention.