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/SelectItemText.vue

@@ -0,0 +1,37 @@
+<script lang="ts">
+import type { PrimitiveProps } from '../../internal/primitive';
+
+/**
+ * The visible label of a `SelectItem`. Its text is what the root captures to
+ * show in `SelectValue` once the item is chosen, so each item should contain
+ * exactly one; use inside a `SelectItem`.
+ */
+export interface SelectItemTextProps extends PrimitiveProps {}
+</script>
+
+<script setup lang="ts">
+import { watchPostEffect } from 'vue';
+
+import { useForwardExpose } from '@robonen/vue';
+import { Primitive } from '../../internal/primitive';
+import { useSelectItemContext } from './context';
+
+const { as = 'span' } = defineProps<SelectItemTextProps>();
+
+const { forwardRef, currentElement } = useForwardExpose();
+const itemCtx = useSelectItemContext();
+
+watchPostEffect(() => {
+  itemCtx.onItemTextChange(currentElement.value);
+});
+</script>
+
+<template>
+  <Primitive
+    :ref="forwardRef"
+    :as="as"
+    :id="itemCtx.textId.value"
+  >
+    <slot />
+  </Primitive>
+</template>