* Refactor chapter filtering and auto-save logic
Simplified chapter filtering to only exclude empty titles, allowing default chapter names. Updated auto-save logic to skip saving when there are no chapters or mediaId. Removed unused helper function and improved debug logging.
* Show default chapter title in editor and set initial title
The chapter title is now always displayed in the textarea, including default names like 'Chapter 1'. Also, the initial segment is created with 'Chapter 1' as its title instead of an empty string for better clarity.
* build assets
* Added frontend development files/environment
* More items-categories related removals
* Improvements in pages templates (inc. static pages)
* Improvements in video player
* Added empty home page message + cta
* Updates in media, playlist and management pages
* Improvements in material icons font loading
* Replaced media & playlists links in frontend dev-env
* frontend package version update
* chnaged frontend dev url port
* static files update
* Changed default position of theme switcher
* enabled frontend docker container
