eb2499bad3
Move the egui editor from a single editor.rs into an editor/ module: mod.rs (aggregator: create(), EditorState, layout, placeholder slider columns), meter.rs (|L|GR|R| meters + ceiling lamp, owns MeterState), and plot.rs (rolling in/out/GR plot, owns PlotState + PlotHistory). Each visualiser owns its GUI state; the aggregator composes them. No behavior change. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>