- Refactored fallback submission logic in `class-event-handler.php` to remove `wp_die`/`exit` calls and use redirects for error handling, enabling proper unit testing.
- Implemented meta-data saving (dates, venue, organizer) in the fallback logic using `update_post_meta`.
- Updated unit tests (`test-event-management.php`) to remove `markTestIncomplete` calls related to handler errors and uncommented meta assertions. Unit tests for fallback logic now pass.
- Added Instructions section and Return to Dashboard button to the event form shortcode (`display_event_form_shortcode`).
- Applied basic theme styling classes (`ast-container`, `notice`, `ast-button`) to the event form.
- Updated `docs/implementation_plan.md` to reflect completion of tasks 4.1-4.5 and set focus to Task 5.
Refs: Task 4.1, 4.2, 4.3, 4.4, 4.5
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