fix(arena): resolve consecutive-invocation navigation issue by ensuring return to home before opening Tactical Challenge
docs(mapping): update Arena task description with navigation bug fix details
- Updated `mapping.md` to reflect completed migration and testing status for event sweep and arena tasks.
- Improved `arena.py` to ensure a return to home screen before opening tactical challenges, preventing navigation errors.
- Enhanced `event_sweep.py` with robust handling for badge carousel navigation, including direct pagination dot clicks and extended wait times for cold-start scenarios.
- Implemented Japanese OCR support for finished event detection in `event_sweep.py`, adding a definitive check to avoid false positives on stale event pages.
- Adjusted retry logic and timeouts in `event_sweep.py` to accommodate longer loading times and ensure accurate stage row detection.
- Updated `setup.sh` to check for the presence of the Japanese OCR language pack, providing installation instructions if missing.
- Documented live testing results and fixes in `plan.md`, confirming successful sweeps and addressing previously reported bugs.
