Add BrowserComponent screenshot test and screenshot comparison automation

[shai-almog]

Summary

• add a BrowserComponent instrumentation test that emits its own CN1SS screenshot stream
• extend the CN1SS helpers and runner to decode multiple tests, compare against stored references, and post PR comments when screenshots change
• add a scripts/android/screenshots directory and a PNG comparison utility to ignore metadata differences
• restore full-resolution screenshot archiving by publishing PNGs as workflow artifacts, encode PR previews as size-capped JPEGs, and add detailed logging and failure markers around PR comment delivery

Testing

• python3 -m compileall scripts/android/tests

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https://chatgpt.com/codex/tasks/task_e_68ee94695b88833195124cff2ce7f8a9

[github-actions]

Android screenshot updates

• BrowserComponent — missing reference. Reference screenshot missing at /home/runner/work/CodenameOne/CodenameOne/scripts/android/screenshots/BrowserComponent.png.

  
  Preview info: Pillow library not available; falling back to PNG previews..
  Full-resolution PNG saved as BrowserComponent.png in workflow artifacts.

[github-actions]

Android screenshot updates

• BrowserComponent — missing reference. Reference screenshot missing at /home/runner/work/CodenameOne/CodenameOne/scripts/android/screenshots/BrowserComponent.png.

  
  Preview info: Pillow library not available; falling back to PNG previews..
  Full-resolution PNG saved as BrowserComponent.png in workflow artifacts.

[github-actions]

✅ Native Android screenshot tests passed.