test(coordinators): expand test coverage for batch 2 coordinators

[MarkSant]

Summary

This PR continues the systematic coordinator test coverage boost (Batch 2).

Coverage & Test Suite Improvements

• Added new test suite \ ests/coordinators/test_video_processing_coordinator_full.py\
• Expanded \ ests/coordinators/test_dialog_coordinator.py\
• Expanded \ ests/coordinators/test_live_camera_session_coordinator.py\
• Expanded \ ests/coordinators/test_report_generation_coordinator.py\
• Expanded \ ests/coordinators/test_ui_state_coordinator.py\

Key Coverage Jumps:

• \dialog_coordinator.py: 97.54%
• \ui_state_coordinator.py: 77.17%
• 
  eport_generation_coordinator.py: 69.18%
• \�ideo_processing_coordinator.py: 66.51%
• \live_camera_session_coordinator.py: 46.84%

Quality & Validation:

• Total 717 coordinator unit tests passing (100% pass rate)
• \mypy\ type checks: 0 issues across all 33 source files
• 
  uff\ lint & formatting: 100% compliant
• All pre-push hooks (formatting, mypy, GUI tests) verified clean.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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