feat: Update age group categories in training stats for better accuracy

mobile-app/composeApp/src/androidMain/kotlin/de/tsschulz/tt_tagebuch/app/stats/TrainingStatsDerived.kt

@@ -228,11 +228,13 @@ object TrainingStatsDerived {
     fun ageGroupStats(filteredMembers: List<TrainingStatsMember>): List<AgeGroupStatRow> {
         data class Bucket(val label: String, val match: (Int?) -> Boolean, var memberCount: Int = 0, var totalP12: Int = 0)
         val buckets = listOf(
-            Bucket("Kinder U13", { a -> a != null && a <= 12 }),
-            Bucket("Jugend U19", { a -> a != null && a in 13..18 }),
-            Bucket("Erwachsene", { a -> a != null && a in 19..59 }),
-            Bucket("Senioren 60+", { a -> a != null && a >= 60 }),
-            Bucket("Ohne Geburtsdatum", { a -> a == null }),
+            Bucket("U7", { a -> a != null && a <= 6 }),
+            Bucket("U9", { a -> a != null && a in 7..8 }),
+            Bucket("U11", { a -> a != null && a in 9..10 }),
+            Bucket("U13", { a -> a != null && a in 11..12 }),
+            Bucket("U15", { a -> a != null && a in 13..14 }),
+            Bucket("U19", { a -> a != null && a in 15..18 }),
+            Bucket("Erwachsene", { a -> a != null && a >= 19 }),
         )
         for (member in filteredMembers) {
             val age = ageFromBirthDate(member.birthDate)
@@ -241,7 +243,6 @@ object TrainingStatsDerived {
             bucket.totalP12 += member.participation12Months
         }
         return buckets
-            .filter { it.memberCount > 0 }
             .map {
                 val mc = it.memberCount
                 AgeGroupStatRow(

mobile-app/gradle/libs.versions.toml

@@ -1,7 +1,7 @@
 [versions]
 # composeApp (Play Store / „Über die App“-Build)
-appVersionCode = "14"
-appVersionName = "1.5.0"
+appVersionCode = "15"
+appVersionName = "1.6.0"
 agp = "9.2.1"
 android-compileSdk = "35"
 android-minSdk = "24"