opt: m3e loading (#1877)

* opt: loading

* feat: refresh m3e

* restore refreshIndicator

---------

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

lib/common/widgets/loading_widget/morphs.dart

@@ -0,0 +1,41 @@
+import 'package:material_new_shapes/material_new_shapes.dart';
+
+abstract final class Morphs {
+  static List<Morph> buildMorph(
+    List<RoundedPolygon> shapes, {
+    bool loop = true,
+  }) {
+    assert(shapes.length >= 2);
+    return [
+      for (var i = 0; i < shapes.length - 1; i++)
+        Morph(shapes[i], shapes[i + 1]),
+      if (loop) Morph(shapes[shapes.length - 1], shapes[0]),
+    ];
+  }
+
+  static final loadingMorphs = buildMorph([
+    MaterialShapes.softBurst,
+    MaterialShapes.cookie9Sided,
+    MaterialShapes.pentagon,
+    MaterialShapes.pill,
+    MaterialShapes.sunny,
+    MaterialShapes.cookie4Sided,
+    MaterialShapes.oval,
+  ]);
+
+  // static final refreshMorphs = buildMorph([
+  //   MaterialShapes.softBurst,
+  //   MaterialShapes.cookie9Sided,
+  //   MaterialShapes.gem,
+  //   MaterialShapes.flower,
+  //   MaterialShapes.sunny,
+  //   MaterialShapes.cookie4Sided,
+  //   MaterialShapes.oval,
+  //   MaterialShapes.cookie12Sided,
+  // ]);
+
+  // static final manualMorph = Morph(
+  //   MaterialShapes.circle,
+  //   MaterialShapes.softBurst,
+  // );
+}