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/internal/utils/useHideOthers.ts

@@ -0,0 +1,59 @@
+import type { MaybeComputedElementRef } from '@robonen/vue';
+import { defaultWindow, tryOnScopeDispose, unrefElement } from '@robonen/vue';
+import { hideOthers } from '@robonen/platform/browsers';
+import { watch } from 'vue';
+
+type Undo = () => void;
+
+const CLOSED_POPOVER_SELECTOR = '[popover]:not(:popover-open)';
+
+/**
+ * Isolated so the try/catch doesn't inhibit Turbofan optimization of the
+ * watcher callback. `:popover-open` throws in browsers that don't support it
+ * (e.g. Safari 18).
+ */
+function isInClosedPopover(el: Element): boolean {
+  try {
+    return el.closest(CLOSED_POPOVER_SELECTOR) !== null;
+  }
+  catch {
+    return false;
+  }
+}
+
+/**
+ * @name useHideOthers
+ * @category Browser
+ * @description Hides every sibling element of `target` from assistive technologies
+ * by setting `aria-hidden="true"`. Automatically restores the original state when
+ * the target is removed or the component scope is disposed. Skips elements living
+ * inside a closed native `[popover]` to avoid double-hiding.
+ *
+ * @param {MaybeComputedElementRef} target Element whose siblings should be aria-hidden
+ *
+ * @since 0.0.14
+ */
+export function useHideOthers(target: MaybeComputedElementRef): void {
+  if (!defaultWindow) return;
+
+  let undo: Undo | undefined;
+
+  watch(() => unrefElement(target), (raw) => {
+    if (undo) {
+      undo();
+      undo = undefined;
+    }
+
+    const el = raw as HTMLElement | undefined;
+    if (!el || isInClosedPopover(el)) return;
+
+    undo = hideOthers(el);
+  }, { flush: 'post' });
+
+  tryOnScopeDispose(() => {
+    if (undo) {
+      undo();
+      undo = undefined;
+    }
+  });
+}