One Save/Discard bar with an inline (Settings card) and floating (Config page)
variant, replacing the two near-identical hand-rolled bars + their state machine.
components/ui/form.tsx replaces the per-panel copies:
- Switch — was duplicated in SettingsPanel (Switch) + ConfigPanel (Toggle) +
Sidebar (inline labeled toggle).
- Section (with a card variant) — was in SettingsPanel + Stats (plain) and
AdminUsers (glass card).
- SettingRow + HintLabel — the label+hint+control row was identical in SettingsPanel + Stats.
No visual change intended (Sidebar's toggle gains the standard knob shadow).
