Fix/log time on click

[nakenyon]

Fix: Use current time when logging plays, not page load time

Summary

When logging a new play, the datetime field was pre-filled with the time the page was loaded rather than the time the user actually interacted with the form. This affected two separate code paths:

• Main track modal (mediaStatusDateHandler.js): The current time was captured once into a const now variable during Alpine.js component initialisation and reused for all subsequent writes — including inside the status-change event listener, which could fire minutes after the page loaded.
• Episode track modal (fill_track_episode.html,fill_track_song.html ): The watch date was set server-side using Django's {% now %} template tag, baking the page-render time into the HTML before the user had even opened the modal.

Changes

• src/static/js/mediaStatusDateHandler.js: Removed the upfront const now = getCurrentDateTime() call and replaced each usage with a fresh getCurrentDateTime() call at the moment the field value is actually written.
• src/templates/app/components/fill_track_episode.html and src/templates/app/components/fill_track_song.html: Replaced the server-rendered {% now %} default with an Alpine x-effect that recomputes the current time (with timezone adjustment) each time the modal is opened. fill_track_song.html is shared between music album and podcast episode tracking.

Testing

1. Open a show's season page and wait a minute or two before clicking to log an episode — the watch date should reflect the time you clicked, not the page load time.
2. On a media detail page, open the track modal, wait, then change the status to Completed or In Progress — the auto-filled date should match the time you changed the status.