feat(primitives): media-editor components, category reorg, perf + type cleanup

Reorganize components into category folders (forms/canvas/overlays/etc.); add the
media-editor headless family (timeline, curve-editor, waveform, crop, color
picker, etc.); apply perf fixes (O(1) collection lookups, plain-object drag
state, gesture-leak teardown, shallowRef color state, rect caching) and replace
source `any` with proper types.

vue/primitives/src/selection/combobox/index.ts

@@ -0,0 +1,52 @@
+export { default as ComboboxAnchor } from './ComboboxAnchor.vue';
+export { default as ComboboxArrow } from './ComboboxArrow.vue';
+export { default as ComboboxCancel } from './ComboboxCancel.vue';
+export { default as ComboboxContent } from './ComboboxContent.vue';
+export { default as ComboboxContentImpl } from './ComboboxContentImpl.vue';
+export { default as ComboboxEmpty } from './ComboboxEmpty.vue';
+export { default as ComboboxGroup } from './ComboboxGroup.vue';
+export { default as ComboboxInput } from './ComboboxInput.vue';
+export { default as ComboboxItem } from './ComboboxItem.vue';
+export { default as ComboboxItemIndicator } from './ComboboxItemIndicator.vue';
+export { default as ComboboxLabel } from './ComboboxLabel.vue';
+export { default as ComboboxPortal } from './ComboboxPortal.vue';
+export { default as ComboboxRoot } from './ComboboxRoot.vue';
+export { default as ComboboxSeparator } from './ComboboxSeparator.vue';
+export { default as ComboboxTrigger } from './ComboboxTrigger.vue';
+export { default as ComboboxViewport } from './ComboboxViewport.vue';
+
+export {
+  useComboboxContentContext,
+  useComboboxGroupContext,
+  useComboboxItemContext,
+  useComboboxRootContext,
+} from './context';
+
+export type {
+  ComboboxContentContext,
+  ComboboxFilterState,
+  ComboboxGroupContext,
+  ComboboxItemContext,
+  ComboboxItemInfo,
+  ComboboxRootContext,
+} from './context';
+
+export { accentInsensitiveContains } from './utils';
+export type { AcceptableValue, ComboboxFilterFunction, ComboboxFilterItem } from './utils';
+
+export type { ComboboxAnchorProps } from './ComboboxAnchor.vue';
+export type { ComboboxArrowProps } from './ComboboxArrow.vue';
+export type { ComboboxCancelProps } from './ComboboxCancel.vue';
+export type { ComboboxContentEmits, ComboboxContentProps } from './ComboboxContent.vue';
+export type { ComboboxContentImplEmits, ComboboxContentImplProps } from './ComboboxContentImpl.vue';
+export type { ComboboxEmptyProps } from './ComboboxEmpty.vue';
+export type { ComboboxGroupProps } from './ComboboxGroup.vue';
+export type { ComboboxInputProps } from './ComboboxInput.vue';
+export type { ComboboxItemIndicatorProps } from './ComboboxItemIndicator.vue';
+export type { ComboboxItemEmits, ComboboxItemProps, ComboboxItemSelectEvent } from './ComboboxItem.vue';
+export type { ComboboxLabelProps } from './ComboboxLabel.vue';
+export type { ComboboxPortalProps } from './ComboboxPortal.vue';
+export type { ComboboxRootEmits, ComboboxRootProps } from './ComboboxRoot.vue';
+export type { ComboboxSeparatorProps } from './ComboboxSeparator.vue';
+export type { ComboboxTriggerProps } from './ComboboxTrigger.vue';
+export type { ComboboxViewportProps } from './ComboboxViewport.vue';