feat: add FilesBlock interface and component integration

- Introduced FilesBlockItem and FilesBlockData interfaces to support file handling in the CMS.
- Integrated FilesBlock component into ContentRows.svelte for rendering file blocks.
- Updated block type handling to include support for files, enhancing content versatility.

src/lib/block-types.ts

@@ -119,6 +119,29 @@ export interface ImageGalleryBlockData {
   layout?: BlockLayout;
 }
 
+/** Einzelne Datei in einem files-Block (CMS file-Field). */
+export interface FilesBlockItem {
+  _type?: "file";
+  src?: string;
+  title?: string;
+  description?: string;
+  /** Aus Sidecar gemerged (size in Bytes). */
+  size?: number;
+  mime?: string;
+  filename?: string;
+}
+
+/** Datei-Block (_type: "files"). items = Array von file-Feldern. */
+export interface FilesBlockData {
+  _type?: "files";
+  _slug?: string;
+  headline?: string;
+  description?: string;
+  items?: Array<string | FilesBlockItem>;
+  forceDownload?: boolean;
+  layout?: BlockLayout;
+}
+
 /** YouTube-Video (_type: "youtube_video"). */
 export interface YoutubeVideoBlockData {
   _type?: "youtube_video";