fix(client/electron): handle EPIPE on stdout and stderr to prevent crash on Linux

[sentry]

On Linux desktop environments, launching the Outline client from a terminal and subsequently closing that terminal breaks the stdout and stderr pipes. Any subsequent write to process.stdout or process.stderr (e.g. from console.log or child process output) throws an unhandled EPIPE error, causing the Electron main process to crash fatally.

This change adds error event listeners on both process.stdout and process.stderr in client/electron/index.ts to silently swallow EPIPE errors while re-throwing any other unexpected stream errors.

Fixes OUTLINE-CLIENTS-NF7VF

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[greptile-apps]

Confidence Score: 5/5

[Medium impact] The PR appears safe to merge.

Summary

Adds error listeners to process.stdout and process.stderr so broken output pipes do not crash the Electron client.

• Closing the launch terminal no longer makes later output crash the Linux client.

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