refactor: Introduce dedicated Document and Asset types and migrate codebase from DocumentLike.

frontend/src/documents/DocumentThumbnailImage.tsx

@@ -1,5 +1,6 @@
 import { useEffect, useMemo, useRef, useState } from 'react';
 import type { CSSProperties, JSX, MutableRefObject } from 'react';
+import type { Document } from '../types/documents';
 import {
   getAssetFromVersion,
   resolveDocumentAssetUrl,
@@ -7,7 +8,6 @@ import {
 } from '../asset_manager';
 import { DEFAULT_THUMBNAIL_SIZE } from '../constants/documents';
 import type {
-  DocumentLike as AssetManagerDocumentLike,
   AssetLike as AssetManagerAssetLike,
   EnsureAssetUrl as AssetManagerEnsureAssetUrl,
   GetAsset as AssetManagerGetAsset,
@@ -65,18 +65,19 @@ const useLazyVisibility = (
   return { ref: targetRef, isVisible };
 };
 
-const getPageCount = (doc?: DocumentLike | null) => {
+
+
+const getPageCount = (doc?: Document | null) => {
   const count = doc?.current_version?.metadata?.page_count;
   return Number.isFinite(count) ? Number(count) : null;
 };
 
-type DocumentLike = AssetManagerDocumentLike;
 type AssetLike = AssetManagerAssetLike;
 type EnsureAssetUrl = AssetManagerEnsureAssetUrl;
 type GetDocumentAsset = AssetManagerGetAsset;
 
 interface DocumentThumbnailImageProps {
-  document?: DocumentLike | null;
+  document?: Document | null;
   ensureAssetUrl?: EnsureAssetUrl;
   getDocumentAsset?: GetDocumentAsset;
   alt?: string;