feat: study modes (fast/parallel) and course-container completion fix
- settings: study.mode fast|normal and study.parallel 1-5 - normal mode: one headless browser per video, visibility keep-alive, auto-degrade when the platform enforces order - report study/log/detail/save before isComplete; drop lastProgressTime on completion - complete periodType 10/13 container nodes and recompute counters via PUT calFinalScore - capture mode: POST /api/capture records all XHR/fetch including new tabs - UI: study mode in settings, capture / stop-capture menu items
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