Add Deckyfin plugin

[avivkilloz]

Add Deckyfin to Plugin Store

Deckyfin lets you manage a Windows game library from the Decky sidebar without leaving Gaming Mode. It's aimed at users who store games on a home server, NAS, or local drive and want to add them to Steam as non-Steam shortcuts with proper Proton configuration and artwork — all from the Deck.

What it does:

• Library view — scans a configured games folder and lists detected games in a card or list view with SteamGridDB artwork
• Steam shortcut integration — adds any game as a non-Steam shortcut with a single tap; removes it just as easily
• Proton version picker — sets a per-game Proton/Wine version via CompatToolMapping (all installed Proton versions listed)
• Dependency installation — installs Windows runtimes (vcrun2022, dotnet40/48, directx9, etc.) into the game's Proton prefix via a 4-method fallback chain (native protontricks → flatpak protontricks → runuser → sudo), with xvfb-run wrapping for headless X display
• Prefix initialization — creates and initializes a fresh Wine/Proton prefix for the game
• SteamGridDB artwork — searches SteamGridDB and applies portrait, hero, logo, and wide art directly to Steam's grid folder; also supports applying any image type manually via URL

Multiple game sources (folders) can be configured, each with its own scan path. Offline network mounts are handled gracefully — the source shows as offline rather than freezing the UI.

Task Checklist

Developer

• I am the original author or an authorized maintainer of this plugin.
• I have abided by the licenses of the libraries I am utilizing, including attaching license notices where appropriate.
• Generative AI was NOT used to write a majority of the code I am submitting.

Plugin

• I have verified that my plugin works properly on the Stable and Beta update channels of SteamOS.
• I have verified my plugin is unique or provides more/alternative functionality to a plugin already on the store.

Backend

• No: I am using a custom backend other than Python.
• No: I am using a tool or software from a 3rd party FOSS project that does not have it's dependencies statically linked.
• No: I am using a custom binary that has all of it's dependencies statically linked.

Community

• I have tested and left feedback on two other pull requests for new or updating plugins.
• I have commented links to my testing report in this PR.

Testing

• Tested by a third party on SteamOS Stable or Beta update channel.

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[avivkilloz]

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[avivkilloz]

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[avivkilloz]

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[avivkilloz]

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