test: improve test coverage from 0% to 99%

[GeiserX]

Summary

• Rewrote test suite from 12 shallow tests (0% source coverage) to 68 comprehensive tests achieving 99% coverage across all 4 source modules
• Mocked Selenium, Playwright, and undetected_chromedriver at import level so tests run in CI without heavy browser dependencies
• Covered __main__ entry point blocks via runpy.run_path for main.py, main2.py, and old_main.py
• Added requests to requirements-test.txt since source modules import it at module level

Test plan

• All 68 tests pass locally
• Coverage: main.py 98%, main2.py 99%, old_main.py 100%, old_video.py 100% (total 99%)
• CI workflow passes on GitHub Actions

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: bf1fe7f6-50c7-45b2-9c42-789b5b37bb6b

📥 Commits

Reviewing files that changed from the base of the PR and between cfca71b and 26e58a5.

📒 Files selected for processing (2)

• requirements-test.txt
• tests/test_web_mirror.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch test/improve-coverage

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.98%. Comparing base (cfca71b) to head (26e58a5).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##            main      #11       +/-   ##
==========================================
+ Coverage   0.00%   98.98%   +98.98%     
==========================================
  Files          4        4               
  Lines        197      197               
==========================================
+ Hits           0      195      +195     
+ Misses       197        2      -195     

see 4 files with indirect coverage changes

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