Effects Runtime Redesign

[anders130]

Replaces the old preset/signal system with a persistent layer stack model backed by SQLite. Effects are composited from individually managed layers, each bound to a zone and an effect definition.

Storage

• New store crate with SQLite via sqlx - tables for zones, effects, scenes, and the active layer stack
• Active scene persists across restarts and reloads into the compositor on startup

Effects System

• Built-in effects rewritten as embedded Rhai TOML files with typed param schemas - 14 effects included
• CompositeEffect ticks LiveParam<f32> (brightness) and LiveParam<Rgb> (primary color) once per frame, giving smooth animated transitions on both
• primary variable injected into every Rhai script scope each frame - scripts react live to color changes without a scene reload
• cull_layers: layers fully eclipsed by a later full-strip override layer are skipped before rendering

API

• GET/POST/PUT/DELETE /effects - effect CRUD (builtins exposed as read-only)
• GET/POST/PUT/DELETE /zones - zone CRUD
• GET/POST/PUT/DELETE /scenes - saved scene CRUD
• GET/POST/DELETE /scenes/active - inspect or manage the active layer stack
• POST /scenes/active/layers - add a layer
• PATCH /scenes/active/layers/{id} - toggle/update a layer
• DELETE /scenes/active/layers/{id} - remove a layer
• PUT /scenes/active/layers/reorder - reorder layers
• PUT /scenes/active - atomically replace all active layers
• POST /scenes/active/save - save current stack as a named scene
• GET/PATCH /device/state - brightness, on/off, color

Internals

• RenderTaskRuntime split into focused modules (mod.rs, reload.rs, state.rs)
• SceneRuntime trait simplified — bus/signal system removed