refactor: asset-store (#18938)

* refactor: asset-store

* Potential fix for code scanning alert no. 152: Prototype-polluting function

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

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Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

web/src/lib/managers/timeline-manager/utils.svelte.ts

@@ -0,0 +1,34 @@
+import type { TimelineAsset } from './types';
+
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+export function updateObject(target: any, source: any): boolean {
+  if (!target) {
+    return false;
+  }
+  let updated = false;
+  for (const key in source) {
+    if (!Object.prototype.hasOwnProperty.call(source, key)) {
+      continue;
+    }
+    if (key === '__proto__' || key === 'constructor') {
+      continue;
+    }
+    const isDate = target[key] instanceof Date;
+    if (typeof target[key] === 'object' && !isDate) {
+      updated = updated || updateObject(target[key], source[key]);
+    } else {
+      if (target[key] !== source[key]) {
+        target[key] = source[key];
+        updated = true;
+      }
+    }
+  }
+  return updated;
+}
+
+export function isMismatched<T>(option: T | undefined, value: T): boolean {
+  return option === undefined ? false : option !== value;
+}
+
+export const assetSnapshot = (asset: TimelineAsset): TimelineAsset => $state.snapshot(asset);
+export const assetsSnapshot = (assets: TimelineAsset[]) => assets.map((asset) => $state.snapshot(asset));