(WIP) feat(desktop): test prediction window

[ZhaoHeh]

Summary

Checklist

• Added or updated necessary tests (Optional).
• Updated documentation to align with changes (Optional).
• Verified no breaking changes, or prepared solutions for any occurring breaking changes (Optional).
• My change does not involve the above items.

[netlify]

✅ Deploy Preview for agent-tars-docs canceled.

Name	Link
🔨 Latest commit	24c6394
🔍 Latest deploy log	https://app.netlify.com/projects/agent-tars-docs/deploys/68b5101180cd2d0008a3167b

[codecov]

Codecov Report

❌ Patch coverage is 0% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 14.19%. Comparing base (5a7200d) to head (24c6394).
⚠️ Report is 28 commits behind head on main.

Files with missing lines	Patch %	Lines
apps/ui-tars/src/main/tray.ts	0.00%	11 Missing ⚠️
apps/ui-tars/src/main/window/ScreenMarker.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1316      +/-   ##
==========================================
- Coverage   14.21%   14.19%   -0.02%     
==========================================
  Files         250      250              
  Lines        8562     8571       +9     
  Branches     1672     1675       +3     
==========================================
  Hits         1217     1217              
- Misses       7170     7179       +9     
  Partials      175      175              

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