Expose wishlist entries as CalDAV tasks.

[RokeJulianLockhart]

Your system information

Steam client version	flatpak install 'https://dl.flathub.org/repo/appstream/com.valvesoftware.Steam.flatpakref' && flatpak update 'app/com.valvesoftware.Steam/x86_64/stable' --commit=173cd565d98d4951bd858bad290e8481a9e72dbf5f7c9c980165a060666184b1 # https://github.com/flatpak/flatpak/issues/3097#issuecomment-1484796387
Distributions	https://download.fedoraproject.org/pub/fedora/linux/releases/40/Spins/x86_64/iso/Fedora-KDE-Live-x86_64-40-1.14.iso
Opted into Steam client beta?	Yes. Specifically, the Families' Beta.
Have you checked for system updates?	Yes
GPU	XFX AMD Radeon RX 5700 from https://www.amazon.co.uk/XFX-Radeon-5700-Boost-Ultra/dp/B07XVMXBQW

Please describe your issue in as much detail as possible

This application allows the user to add store listings to a Steam-specific wishlist. However, these listings cannot be accessed by the user in a uniform manner with their other task lists. This is problematic for me, because it prevents me knowing cohesively what I still have yet to buy alongside the things that I track elsewhere (for instance, if unavailable via Steam).

Consequently, I suggest that Steam provide a CalDAV calendar for these so that I can more easily budget for my Steam games. Otherwise, I'm going to have to remove all of the entries I currently have on my Steam wishlist to transfer them as URIs to a more cohesive Nextcloud task list, thus losing notifications for sales, etcetera.

As bookwyrm-social/bookwyrm#2952 (comment) states:

Additional context

Read-only exposure would easily be enough for me, at least for now, because it would still allow me to easily see offline what's in each list, although it wouldn't allow me to cache offline changes to later be applied when online, like modification support would.

Relevant

1. https://gitlab.com/gitlab-org/gitlab/-/issues/14390
2. [FR] Add CalDAV support. taigaio/taiga-back#128 (comment)
3. [Feature Request] Task support (CalDAV?) raindropio/app#82 (comment)
4. [Feature Request] Expose lists via CalDAV. wishlephant/wishlephant-website#1 (comment)
5. [Enhancement] Expose user lists via CalDAV. bookwyrm-social/bookwyrm#2952 (comment)
6. Expose user lists via CalDAV. recloudstream/cloudstream#550 (comment)