Fixes three critical production issues discovered on upskillhvac.com:
✅ Dashboard Fatal Errors (class-hvac-dashboard-data.php):
- Added class_exists('Tribe__Events__Main') checks before accessing TEC constants
- Prevents fatal errors when TEC plugin loads after our code
- Applied to get_total_events_count(), get_upcoming_events_count(), and get_past_events_count()
- Gracefully returns 0 when TEC is not available
✅ Event Edit Security Check Failure (page-edit-event-custom.php):
- Fixed nonce action mismatch: changed 'hvac_edit_event' to 'hvac_event_action'
- Aligns with HVAC_Event_Manager::NONCE_ACTION constant
- Resolves "Security check failed" error on event update forms
✅ Google Drive Folder Update:
- Updated embedded folder ID from 16uDRkFcaEqKUxfBek9VbfbAIeFV77nZG to 1-SDHGR9Ix6BmUVTHa3wI99K0rwfWL-vs
- Applied to templates/page-trainer-resources.php (trainer resources page)
- Applied to includes/class-hvac-announcements-display.php (shortcode default)
- Updated tests/unit/test-announcements-display.php (test references)
All changes tested and verified on production.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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