Enhance FM synthesis + cleaning code architecture

src/components/index.ts

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+// UI Components
+export { Knob } from './ui/Knob'
+export { Slider } from './ui/Slider'
+export { Switch } from './ui/Switch'
+export { Dropdown } from './ui/Dropdown'
+
+// Tile Components
+export { BytebeatTile } from './tile/BytebeatTile'
+export { FormulaEditor } from './tile/FormulaEditor'
+
+// Control Components
+export { EngineControls } from './controls/EngineControls'
+export { EffectsBar } from './controls/EffectsBar'
+export { LFOPanel } from './controls/LFOPanel'
+export { MappingEditor } from './controls/MappingEditor'
+
+// Modal Components
+export { AudioContextWarning } from './modals/AudioContextWarning'
+export { HelpModal } from './modals/HelpModal'
+
+// Scope Components
+export { LFOScope } from './scopes/LFOScope'