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/select/index.ts

@@ -0,0 +1,61 @@
+export { default as SelectRoot } from './SelectRoot.vue';
+export { default as SelectTrigger } from './SelectTrigger.vue';
+export { default as SelectValue } from './SelectValue.vue';
+export { default as SelectIcon } from './SelectIcon.vue';
+export { default as SelectPortal } from './SelectPortal.vue';
+export { default as SelectContent } from './SelectContent.vue';
+export { default as SelectContentImpl } from './SelectContentImpl.vue';
+export { default as SelectItemAlignedPosition } from './SelectItemAlignedPosition.vue';
+export { default as SelectPopperPosition } from './SelectPopperPosition.vue';
+export { default as SelectViewport } from './SelectViewport.vue';
+export { default as SelectScrollUpButton } from './SelectScrollUpButton.vue';
+export { default as SelectScrollDownButton } from './SelectScrollDownButton.vue';
+export { default as SelectGroup } from './SelectGroup.vue';
+export { default as SelectLabel } from './SelectLabel.vue';
+export { default as SelectItem } from './SelectItem.vue';
+export { default as SelectItemText } from './SelectItemText.vue';
+export { default as SelectItemIndicator } from './SelectItemIndicator.vue';
+export { default as SelectSeparator } from './SelectSeparator.vue';
+export { default as SelectArrow } from './SelectArrow.vue';
+export { default as SelectProvider } from './SelectProvider.vue';
+export { default as SelectBubbleSelect } from './SelectBubbleSelect.vue';
+
+export {
+  useSelectRootContext,
+  useSelectContentContext,
+  useSelectItemAlignedPositionContext,
+  useSelectGroupContext,
+  useSelectItemContext,
+} from './context';
+
+export type {
+  SelectValue,
+  SelectOption,
+  SelectRootContext,
+  SelectContentContext,
+  SelectItemAlignedPositionContext,
+  SelectGroupContext,
+  SelectItemContext,
+} from './context';
+export type { AcceptableValue as SelectAcceptableValue } from './utils';
+export type { SelectRootProps, SelectRootEmits } from './SelectRoot.vue';
+export type { SelectTriggerProps } from './SelectTrigger.vue';
+export type { SelectValueProps } from './SelectValue.vue';
+export type { SelectIconProps } from './SelectIcon.vue';
+export type { SelectPortalProps } from './SelectPortal.vue';
+export type { SelectContentProps, SelectContentEmits } from './SelectContent.vue';
+export type { SelectContentImplProps, SelectContentImplEmits } from './SelectContentImpl.vue';
+export type { SelectItemAlignedPositionProps, SelectItemAlignedPositionEmits } from './SelectItemAlignedPosition.vue';
+export type { SelectPopperPositionProps, SelectPopperPositionEmits } from './SelectPopperPosition.vue';
+export type { SelectViewportProps } from './SelectViewport.vue';
+export type { SelectScrollUpButtonProps } from './SelectScrollUpButton.vue';
+export type { SelectScrollDownButtonProps } from './SelectScrollDownButton.vue';
+export type { SelectGroupProps } from './SelectGroup.vue';
+export type { SelectLabelProps } from './SelectLabel.vue';
+export type { SelectItemProps, SelectItemEmits, SelectItemSelectEvent } from './SelectItem.vue';
+export type { SelectItemTextProps } from './SelectItemText.vue';
+export type { SelectItemIndicatorProps } from './SelectItemIndicator.vue';
+export type { SelectSeparatorProps } from './SelectSeparator.vue';
+export type { SelectArrowProps } from './SelectArrow.vue';
+export type { SelectProviderProps } from './SelectProvider.vue';
+export type { SelectBubbleSelectProps } from './SelectBubbleSelect.vue';