Second phase of #118 for settings_plugin: the 2,857-line mod.rs becomes
four focused submodules along existing system boundaries —
mod.rs 561 types, markers, SettingsButton, plugin build, persistence
input.rs 632 button/hotkey handlers, focus attachment, scrolling
updates.rs 495 per-frame value-text updater systems + label helpers
ui.rs 1,231 spawn_settings_panel + row builders + thumbnails
Moved items are pub(super); mod.rs glob-imports the submodules so
system registration and tests keep their bare names. No behaviour
change; all 29 settings tests pass unchanged.
Refs #118
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
funman300