Add icon + description to plugin.json for the v3 Pedalboard Plugins page

[mogul]

Restored from slopsmith/slopsmith-plugin-practice#8 — original issue, opened by @byrongamatos on 2026-06-10.
[restored-from: slopsmith/slopsmith-plugin-practice#8]

The v0.3.0 ("fee[dB]ack") v3 UI redesigns the Plugins page as a set of guitar pedalboards — each plugin renders as a stompbox pedal with a thumbnail, name, and short description, grouped by category.

To make your plugin's pedal look its best, please consider adding these optional, additive fields to your plugin.json. They're fully backward-compatible — omit them and the plugin still loads (it just gets a default pedal graphic and no blurb):

{
  "description": "One short sentence describing the plugin.",
  "category": "audio",
  "icon": "assets/thumb.png"
}

• description — one short sentence, shown under the pedal name (clamped to ~2 lines).
• category — which pedalboard the pedal sits on: one of audio | creation | practice | game | tools (free-form; unknown/absent falls back to a sensible default).
• icon — an assets/-relative thumbnail (roughly square, ~256×256, PNG or SVG), served via the sandboxed /api/plugins/<id>/assets/... route (same containment rule as the styles field).
  • Shortcut: if you ship assets/thumb.png and omit icon, the loader auto-detects it — no manifest change needed.

These fields are surfaced by slopsmith core's /api/plugins (landing in v0.3.0). Full details in core: docs/plugin-v3-ui.md and docs/plugin-manifest.schema.json.

Thanks for keeping your plugin looking sharp on the new pedalboard! 🎸