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/menus/menu/MenuRadioGroup.vue

@@ -0,0 +1,49 @@
+<script lang="ts">
+import type { PrimitiveProps } from '../../internal/primitive';
+import type { AcceptableValue } from './utils';
+
+/**
+ * Wraps a set of MenuRadioItems so that only one can be selected at a time,
+ * managing the shared selected value. Bind `v-model` to control the selection,
+ * or supply `defaultValue` to leave it uncontrolled. Values may be any
+ * serialisable type (string / number / boolean / object), not just strings.
+ * Renders through MenuGroup so a nested MenuLabel labels the group.
+ */
+export interface MenuRadioGroupProps extends PrimitiveProps {
+  /** The controlled selected value. Use together with `update:modelValue`. */
+  modelValue?: AcceptableValue;
+  /** The selected value when uncontrolled. */
+  defaultValue?: AcceptableValue;
+}
+export interface MenuRadioGroupEmits {
+  'update:modelValue': [value: AcceptableValue];
+}
+</script>
+
+<script setup lang="ts">
+import { computed, shallowRef } from 'vue';
+
+import MenuGroup from './MenuGroup.vue';
+import { provideMenuRadioGroupContext } from './context';
+
+const { modelValue, defaultValue, as = 'div' } = defineProps<MenuRadioGroupProps>();
+const emit = defineEmits<MenuRadioGroupEmits>();
+defineSlots<{ default?: (props: { modelValue: AcceptableValue | undefined }) => unknown }>();
+
+const local = shallowRef(defaultValue);
+const value = computed(() => modelValue !== undefined ? modelValue : local.value);
+
+provideMenuRadioGroupContext({
+  modelValue: value,
+  onValueChange: (v) => {
+    local.value = v;
+    emit('update:modelValue', v);
+  },
+});
+</script>
+
+<template>
+  <MenuGroup :as="as">
+    <slot :model-value="value" />
+  </MenuGroup>
+</template>