Update File I/O Docs

[tembo]

Summary

Update Playwright file I/O documentation with:

• New download behavior using behavior: 'default'
• Simplified file upload examples using setInputFiles()
• Removed manual file upload to browser VM
• Updated download directory to use ~/Downloads

Description

This PR updates the file I/O documentation to:

• Recommend behavior: 'default' for browser downloads
• Simplify file upload examples using Playwright's native setInputFiles() method
• Remove complex file transfer steps
• Use standard ~/Downloads directory for downloads

Changes include:

• Updated code examples in TypeScript and Python
• Added note about default download behavior
• Demonstrated file upload with local file and buffer

Implementation Checklist

• Updated file I/O documentation
• Verify examples work with current Playwright version

Testing

• Verified examples run correctly
• Confirmed mintlify dev works

Related Issue

Fixes KERNEL-793

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Note

Updates File I/O docs focusing on Playwright downloads and uploads.

• Recommend Browser.setDownloadBehavior with behavior: 'default'; downloads go to ~/Downloads (added note) and examples poll listFiles before reading
• Revise TS/Python download examples: remove custom downloadPath, use home Downloads, add CDP listeners, wait/poll, and save locally
• Simplify uploads: show setInputFiles() with local path or buffer; remove manual file transfer to browser VM; add form submit and result verification
• Minor cleanup of imports and comments across examples

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