Take over and integrate Focal Board as a Desktop client

State

Deck is very nice. However it's a web only tool that requires a user to be online.
It can - depending on the browser and various other circumstances - also be rather slow.
There's a synchronizing client for Android. It's nice. There is none for the desktop, even given the challenges above.

Mattermost created Focalboard. Nowadays a deck equivalent for mostly server & browser use, there used to be a stand alone version, a desktop version if you will.
Made with the usual desktop JS+wrappers stack, thus cross-platform usable.
Functionality is close to what deck offers, however, only running on an embedded sqlite database.

Mattermost abandoned said stand-alone version some years ago and is since searching for new maintainers. The tool is still very useful, albeit obviously outdated.

See here for the repo: https://github.com/mattermost-community/focalboard/issues/5038

Proposal

• Take over maintenance of the Focalboard
• Renovate, turn into the Nextcloud Desktop Client equivalent for Deck.
• In other words: Offline capable, syncing desktop version of Deck.
• Useful standalone, even more useful with Nextcloud & Deck connection.

#7150 is loosely related.

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Start by reviewing the linked Focalboard issue 5038 and the related Deck issue #7150, then inspect how Deck currently handles synchronization and how the former standalone Focalboard client was structured. The issue provides no files, entry points, tests, or concrete acceptance criteria; done would require an agreed scope for a maintained, offline-capable desktop client connected to Deck.