feat: add audio-output-switcher plugin

[rael2pac]

Plugin

• Id: rael2pac/audio-output-switcher
• New plugin

What it does

Route individual apps to different audio outputs. Each playing app appears in the panel with buttons to switch it to any available output (headphones, HDMI, Bluetooth, USB, etc.). Works with PipeWire/PulseAudio.

External dependencies

• pactl for listing sinks and moving sink inputs

Testing

• Tested on Niri
• Tested on Hyprland
• Tested on Sway
• Noctalia version tested against: v5 latest
• Plugin API level: 3

Screenshots / Videos

Checklist

• Directory name matches the part of id after / in plugin.toml exactly.
• Ships plugin.toml, README.md, thumbnail.webp, and translations/en.json.
• README.md follows the README template.
• Created thumbnail.webp with the thumbnail generator. (TODO)
• version follows semver; plugin_api is the oldest API level required.
• Did not edit catalog.toml.
• This PR touches exactly one plugin directory.

Code review attestation

• The code is readable and not obfuscated, minified, or generated.
• It does not download and execute remote code.
• Every network call, filesystem write, and spawned process is accounted for above.
• I have the right to publish this code under the license declared in plugin.toml.

[ItsLemmy]

1. blocking - audio-output-switcher/plugin.toml:1

The manifest omits the required dependencies field even though service.luau:44 and panel.luau:49 execute pactl. This causes validation to fail. Declare
pactl and document it under a Requirements section in the README.

2. blocking - audio-output-switcher/translations/en.json:2

The translations use flat dotted keys, and refreshInterval and noStreams contain uppercase characters. These violate the translation-key rules. Manifest
references at plugin.toml:30 and plugin.toml:31 also fail validation. Use nested JSON objects and consistent lowercase key segments throughout the
manifest and source.

3. blocking - audio-output-switcher/widget.luau:46

The widget toggles rael2pac/audio-switcher:panel, but the declared panel is rael2pac/audio-output-switcher:panel at plugin.toml:1 and plugin.toml:20.
Clicking the bar widget therefore cannot open its panel as advertised.

4. non-blocking - audio-output-switcher/panel.luau:157

Callbacks are generated for every stream, but handlers only exist for streams 1 through 6 at panel.luau:79 through panel.luau:113. The seventh and eighth
streams advertised in README.md:33 receive nonexistent callbacks, so their routing buttons will not work.