Design-system header map

This map is generated from docs/reference/design-system-api.json. It records 8 public-header/type groups and the related contract page. It is header metadata, not a complete function-signature inventory.

Use the design-system guide and each public header for behavior and declarations.

Public header	Type groups recorded in the metadata
`include/imkit/theme.h`	`ColorScheme`, `ContrastMode`, `Density`, `Easing`, `Typography`, `SpacingTokens`, `Radius`, `Stroke`, `Elevation`, `Opacity`, `StateColors`, `SemanticColors`, `Palette`, `Metrics`, `Motion`, `FontSet`, `EditorPalette`, `Theme`, `ThemeScope`, `AnimationState`, `ThemePreset`
`include/imkit/accessibility.h`	`SemanticRole`, `SemanticAction`, `SemanticState`, `SemanticNode`, `AccessibilityTree`, `AccessibilitySink`, `ActionRequest`, `ActionQueue`, `AccessibilityFrame`
`include/imkit/accessibility_win32.h`
`include/imkit/locale.h`	`TextDirection`, `LocaleContext`
`include/imkit/components.h`	`ActionVariant`, `CheckState`, `StatusKind`, `CompactActionRowRequest`, `ComponentOptions`, `CompactActionRowOptions`, `Notification`
`include/imkit/patterns.h`	`Command`, `CommandPaletteState`, `SplitButtonResult`, `ToolbarState`, `DialogState`, `DialogResult`, `FormFieldInfo`, `ProgressStatus`, `ProgressTrackView`, `AdaptiveSplitState`, `VisibleRange`, `ListProvider`, `DataColumn`, `DataAction`, `DataEvent`, `DataProvider`, `DataTableState`
`include/imkit/workflow.h`	`WorkspaceTab`, `ChoiceItem`, `ChoiceGroupOptions`, `HierarchyRowView`, `HierarchyRowAction`, `StageProgressItem`, `StageProgressView`, `TaskProgressCardView`, `TaskProgressCardOptions`
`include/imkit/toast.h`	`ToastView`, `ToastPosition`, `ToastPhase`, `ToastViewportState`, `ToastViewportOptions`, `ToastEvent`, `ToastEventBuffer`