opt: m3e loading (#1877)

* opt: loading

* feat: refresh m3e

* restore refreshIndicator

---------

Co-authored-by: dom <githubaccount56556@proton.me>

lib/common/widgets/image_viewer/loading_indicator.dart

@@ -18,6 +18,7 @@
 import 'dart:math' show pi;
 
 import 'package:flutter/material.dart';
+import 'package:flutter/semantics.dart' show SemanticsConfiguration;
 
 ///
 /// created by dom on 2026/02/14
@@ -73,6 +74,7 @@ class RenderLoadingIndicator extends RenderBox {
     if (_progress == value) return;
     _progress = value;
     markNeedsPaint();
+    markNeedsSemanticsUpdate();
   }
 
   @override
@@ -119,6 +121,16 @@ class RenderLoadingIndicator extends RenderBox {
       );
   }
 
+  @override
+  void describeSemanticsConfiguration(SemanticsConfiguration config) {
+    super.describeSemanticsConfiguration(config);
+    config
+      ..role = .progressBar
+      ..minValue = '0'
+      ..maxValue = '100'
+      ..value = (_progress * 100).round().toString();
+  }
+
   @override
   bool get isRepaintBoundary => true;
 }