feat: Make label fields less restrictive, improve change detection in document edit page

lib/features/document_details/view/widgets/document_content_widget.dart

@@ -2,44 +2,50 @@ import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:paperless_api/paperless_api.dart';
 import 'package:paperless_mobile/core/widgets/highlighted_text.dart';
+import 'package:paperless_mobile/core/widgets/shimmer_placeholder.dart';
+import 'package:paperless_mobile/extensions/flutter_extensions.dart';
 import 'package:paperless_mobile/features/document_details/cubit/document_details_cubit.dart';
 import 'package:paperless_mobile/generated/l10n/app_localizations.dart';
 
 class DocumentContentWidget extends StatelessWidget {
   final bool isFullContentLoaded;
-  final String? fullContent;
   final String? queryString;
   final DocumentModel document;
   const DocumentContentWidget({
     super.key,
     required this.isFullContentLoaded,
-    this.fullContent,
     required this.document,
     this.queryString,
   });
 
   @override
   Widget build(BuildContext context) {
+    final screenWidth = MediaQuery.sizeOf(context).width;
     return SliverToBoxAdapter(
       child: Column(
         crossAxisAlignment: CrossAxisAlignment.start,
         children: [
           HighlightedText(
-            text: (isFullContentLoaded ? fullContent : document.content) ?? "",
+            text: document.content ?? '',
             highlights: queryString != null ? queryString!.split(" ") : [],
             style: Theme.of(context).textTheme.bodyMedium,
             caseSensitive: false,
           ),
-          if (!isFullContentLoaded && (document.content ?? '').isNotEmpty)
-            Align(
-              alignment: Alignment.bottomCenter,
-              child: TextButton(
-                child: Text(S.of(context)!.loadFullContent),
-                onPressed: () {
-                  context.read<DocumentDetailsCubit>().loadFullContent();
-                },
+          if (!isFullContentLoaded)
+            ShimmerPlaceholder(
+              child: Column(
+                crossAxisAlignment: CrossAxisAlignment.start,
+                children: [
+                  for (var scale in [0.5, 0.9, 0.5, 0.8, 0.9, 0.9])
+                    Container(
+                      margin: const EdgeInsets.symmetric(vertical: 4),
+                      width: screenWidth * scale,
+                      height: 14,
+                      color: Colors.white,
+                    ),
+                ],
               ),
-            ),
+            ).paddedOnly(top: 4),
         ],
       ),
     );