feat(fileDto, folderDto): add is_favorite + is_shared

- provide is_shared and is_favorite information in DTO, information propagated as badge/buttons per items
      regarding performances I try to be minimalis on SQL to prevent any perf regression

    - remove old set of sharedids and favoriteids (was not functionnal anymore)
    - fix date picker (no past selection) in grant
    - fix contextmenu close on /files section

frontend/src/lib/utils/media.ts

@@ -38,6 +38,10 @@ export function minimalPhotoItem(id: string): FileItem {
 		size_formatted: '',
 		sort_date: 0,
 		etag: '',
-		content_hash: ''
+		content_hash: '',
+		// Stub item — never wired to a live server response, so the
+		// two required wire flags default to the safe "not set" value.
+		is_favorite: false,
+		is_shared: false
 	};
 }