fix: Set timezone for end time and dynamically calculate event end

[shfc]

Description

The event status doesn't update correctly from upcoming to past because the event dates were being parsed with the incorrect timezone (default UTC) and the event end time was calculated outside the component, preventing updates after the initial render.

Changes Made

• Updated the getEventDate function to correctly parse and convert event dates to the ACST timezone using luxon.
• The event filtering logic is replaced inside the Events component, ensuring these values are recalculated on each render.
• Added a comment in events.ts to specify that all event times are in ACST.

Related Issues

Fixes #177

Additional Notes

N/A

[jsun969]

LGTM