improved code readability

lib/main.dart

@@ -1,9 +1,9 @@
 import 'package:flutter/material.dart';
+import 'dart:io' show Platform;
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:google_nav_bar/google_nav_bar.dart';
 import 'package:sqflite_common_ffi/sqflite_ffi.dart';
 import 'package:google_fonts/google_fonts.dart';
-import 'dart:io' show Platform;
 
 import 'package:openlib/ui/extensions.dart';
 import 'package:openlib/ui/trending_page.dart';
@@ -22,9 +22,12 @@ void main() async {
   }
 
   Database db = await Sqlite.initDb();
-  runApp(ProviderScope(
+  runApp(
+    ProviderScope(
       overrides: [dbProvider.overrideWithValue(MyLibraryDb(dbInstance: db))],
-      child: const MyApp()));
+      child: const MyApp(),
+    ),
+  );
 }
 
 class MyApp extends StatelessWidget {

lib/ui/pdf_viewer.dart

@@ -68,8 +68,9 @@ class _PdfViewerState extends ConsumerState<PdfViewer> {
     if (await canLaunchUrl(fileUrl)) {
       await launchUrl(fileUrl);
     } else {
+      // ignore: use_build_context_synchronously
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(
+        const SnackBar(
             content: Text(
           'Could not open the PDF',
           textAlign: TextAlign.center,
@@ -150,6 +151,7 @@ class _PdfViewerState extends ConsumerState<PdfViewer> {
                     )),
                 onPressed: () async {
                   await _openPdfWithDefaultViewer("file://${widget.filePath}");
+                  // ignore: use_build_context_synchronously
                   Navigator.pop(context);
                 },
                 child: const Padding(