revert: rounded subject average

firka/lib/ui/phone/pages/home/home_grades.dart

@@ -114,6 +114,7 @@ class _HomeGradesScreen extends FirkaState<HomeGradesScreen> {
       final allLessons = lessons!.response!;
 
       final subjectAverage = allGrades.getSubjectAverage();
+      final roundedSubjectAverage = allGrades.getRoundedSubjectAverage();
       final classAverages = classAvgs!.response!
           .map((c) => c.classGroupAverage)
           .nonNulls;
@@ -223,6 +224,39 @@ class _HomeGradesScreen extends FirkaState<HomeGradesScreen> {
                         ),
                     ],
                   ),
+                  FirkaCard(
+                    left: [
+                      Text(
+                        widget.data.l10n.subject_avg_rounded,
+                        style: appStyle.fonts.B_16SB.apply(
+                          color: appStyle.colors.textPrimary,
+                        ),
+                      ),
+                    ],
+                    right: [
+                      if (roundedSubjectAverage != null)
+                        Container(
+                          width: 48,
+                          height: 26,
+                          decoration: ShapeDecoration(
+                            color: getGradeColor(
+                              roundedSubjectAverage,
+                            ).withAlpha(38),
+                            shape: RoundedRectangleBorder(
+                              borderRadius: BorderRadius.circular(12),
+                            ),
+                          ),
+                          child: Center(
+                            child: Text(
+                              roundedSubjectAverage.toStringAsFixed(2),
+                              style: appStyle.fonts.B_16R.apply(
+                                color: getGradeColor(roundedSubjectAverage),
+                              ),
+                            ),
+                          ),
+                        ),
+                    ],
+                  ),
                   FirkaCard(
                     left: [
                       Text(

firka_common/lib/ui/components/grade_helpers.dart

@@ -64,6 +64,27 @@ extension GradeListExtension on Iterable<Grade> {
     ).getAverage();
   }
 
+  double? getRoundedSubjectAverage({
+    double t1 = 1,
+    double t2 = 0.5,
+    double t3 = 0.5,
+    double t4 = 0.5,
+  }) {
+    final averages = map((g) => g.subject).toSet().map((subject) {
+      final average = getAverageBySubject(subject);
+      if (average == null) {
+        return null;
+      }
+      return roundGrade(average, t1: t1, t2: t2, t3: t3, t4: t4);
+    }).nonNulls;
+
+    if (averages.isEmpty) {
+      return null;
+    }
+
+    return averages.reduce((sum, avg) => sum + avg) / averages.length;
+  }
+
   double? getSubjectAverage() {
     final averages = map(
       (g) => g.subject,