fix & opt

fix: android in-app upgrade
fmt: proj struct
opt: fetch primaryColor

lib/core/utils/misc.dart

@@ -0,0 +1,23 @@
+import 'dart:io';
+
+import 'package:flutter/widgets.dart';
+import 'package:share_plus/share_plus.dart';
+
+import '../../generated/l10n.dart';
+
+Future<bool> shareFiles(BuildContext context, List<String> filePaths) async {
+  for (final filePath in filePaths) {
+    if (!await File(filePath).exists()) {
+      return false;
+    }
+  }
+  var text = '';
+  if (filePaths.length == 1) {
+    text = filePaths.first.split('/').last;
+  } else {
+    text = '${filePaths.length} ${S.of(context).files}';
+  }
+  final xfiles = filePaths.map((e) => XFile(e)).toList();
+  await Share.shareXFiles(xfiles, text: 'ServerBox -> $text');
+  return filePaths.isNotEmpty;
+}