Add Flicker — screen-reactive ambient RGB lighting for the ROG Ally

[wjames111]

Add Flicker to Plugin Store

Flicker turns the ROG Ally's RGB joystick rings into screen-reactive ambient lighting — the rings follow the dominant color on screen, in games and on the desktop (red boss room → red rings, forest → green, fire → orange).

• Unified mode is zero-setup: it captures gamescope's PipeWire video node (user-level, no root/caps) and drives the rings through Handheld Daemon's API. Enable it and it works.
• Split / Quad (per-zone) are opt-in and need a one-time sudo ./decky-setup.sh — the Aura MCU hidraw is root-locked by HHD, so that path runs as a root systemd unit.
• It's ROG Ally / Ally X specific (it drives the Asus Aura RGB MCU), so a Steam Deck has no rings to light. Developed and tested on Bazzite on a ROG Ally X. Nothing equivalent exists on the store.

Honest disclosure — please read

I understand the llm usage concerns, plagiarism/bloat/buggy code etc, I feel the frustration and pain but I'd encourage you to reconsider in today's development climate, specifically for this plugin I'm submitting. I think its a really cool addition, that doesn't exist yet. If you want I can rewrite it by hand, fix the commit history, workout the bugs etc.

I've intentionally left the "Generative AI was NOT used" box unchecked rather than falsely certify it — I'd rather be transparent and let you decide on the merits.

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.
• Yes: I am using a tool or software from a 3rd party FOSS project that does not have it's dependencies statically linked. (System GStreamer + ffmpeg.)
• 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 Preview update channel.

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