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/overlays/drawer/index.ts

@@ -0,0 +1,31 @@
+export { default as DrawerRoot } from './DrawerRoot.vue';
+export { default as DrawerRootNested } from './DrawerRootNested.vue';
+export { default as DrawerContent } from './DrawerContent.vue';
+export { default as DrawerOverlay } from './DrawerOverlay.vue';
+export { default as DrawerHandle } from './DrawerHandle.vue';
+
+export type { DrawerRootEmits, DrawerRootProps, DrawerHandleProps } from './controls';
+export type { DrawerContentEmits, DrawerContentProps } from './DrawerContent.vue';
+export type { DrawerOverlayProps } from './DrawerOverlay.vue';
+export type { DrawerDirection, SnapPoint } from './types';
+
+export { injectDrawerRootContext, provideDrawerRootContext } from './context';
+export type { DrawerRootContext } from './context';
+
+// Parts with no drawer-specific behaviour reuse Dialog directly, re-exported
+// under Drawer names so consumers stay within one namespace.
+export {
+  DialogClose as DrawerClose,
+  DialogDescription as DrawerDescription,
+  DialogPortal as DrawerPortal,
+  DialogTitle as DrawerTitle,
+  DialogTrigger as DrawerTrigger,
+} from '../dialog';
+
+export type {
+  DialogCloseProps as DrawerCloseProps,
+  DialogDescriptionProps as DrawerDescriptionProps,
+  DialogPortalProps as DrawerPortalProps,
+  DialogTitleProps as DrawerTitleProps,
+  DialogTriggerProps as DrawerTriggerProps,
+} from '../dialog';