fix(android): even concert rows — fixed calendar-style date block

The "16. Sep. 2026" date wrapped inside the 52dp column, so rows with/without
a time ended up different heights and the divider/venue misaligned. The date
block is now a fixed 56dp calendar block: big day number, small month/year and
time, each single-line — every row is the same height and lines up.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

android/app/src/main/kotlin/com/novasonic/app/ui/component/ConcertsSheet.kt

@@ -88,7 +88,7 @@ fun ConcertsSheet(
 
 @Composable
 private fun EventRow(event: ConcertEvent, onTicketClick: (String) -> Unit) {
-    val (dateStr, timeStr) = formatEventDateTime(event.datetime)
+    val w       = formatEventWhen(event.datetime)
     val venue   = event.venue?.name.orEmpty()
     val city    = listOfNotNull(event.venue?.city, event.venue?.country).joinToString(", ")
     val offer   = event.offers.firstOrNull { !it.url.isNullOrBlank() }
@@ -102,26 +102,33 @@ private fun EventRow(event: ConcertEvent, onTicketClick: (String) -> Unit) {
             .background(NsSurface2)
             .padding(horizontal = 14.dp, vertical = 12.dp),
     ) {
-        // Date block
+        // Date block — fixed width, calendar style (day big, month/year + time small) so every
+        // row is the same height and the divider/venue line up.
         Column(
             horizontalAlignment = Alignment.CenterHorizontally,
-            modifier = Modifier.width(52.dp),
+            modifier = Modifier.width(56.dp),
         ) {
             Text(
-                dateStr,
+                w.day,
                 fontFamily = Outfit, fontWeight = FontWeight.Bold,
-                fontSize = 13.sp, color = NsAccent,
+                fontSize = 18.sp, color = NsAccent, maxLines = 1,
             )
-            if (timeStr.isNotBlank()) {
+            if (w.monthYear.isNotBlank()) {
                 Text(
-                    timeStr,
+                    w.monthYear,
-                    fontFamily = Outfit, fontSize = 11.sp, color = NsOnSurface2,
+                    fontFamily = Outfit, fontSize = 10.sp, color = NsOnSurface2, maxLines = 1,
+                )
+            }
+            if (w.time.isNotBlank()) {
+                Text(
+                    w.time,
+                    fontFamily = Outfit, fontSize = 10.sp, color = NsOnSurface2, maxLines = 1,
                 )
             }
         }
 
         Spacer(Modifier.width(14.dp))
-        Box(Modifier.width(1.dp).height(36.dp).background(NsBorder))
+        Box(Modifier.width(1.dp).height(40.dp).background(NsBorder))
         Spacer(Modifier.width(14.dp))
 
         // Venue
@@ -166,19 +173,21 @@ private fun EventRow(event: ConcertEvent, onTicketClick: (String) -> Unit) {
     }
 }
 
-private val DATE_FMT = DateTimeFormatter.ofPattern("dd. MMM yyyy", Locale.GERMAN)
+private data class EventWhen(val day: String, val monthYear: String, val time: String)
+
+private val DAY_FMT   = DateTimeFormatter.ofPattern("dd", Locale.GERMAN)
+private val MONTH_FMT = DateTimeFormatter.ofPattern("MMM yyyy", Locale.GERMAN)
 private val TIME_FMT  = DateTimeFormatter.ofPattern("HH:mm")
 
-private fun formatEventDateTime(datetime: String): Pair<String, String> {
+private fun formatEventWhen(datetime: String): EventWhen {
     return try {
         // Backend now sends a naive venue-local datetime ("2026-09-16T20:00:00"); older/zoned
         // values ("…Z") still parse via the ZonedDateTime fallback.
         val ldt = runCatching { LocalDateTime.parse(datetime) }
             .getOrElse { ZonedDateTime.parse(datetime).toLocalDateTime() }
-        val date = ldt.format(DATE_FMT)
         val time = if (ldt.hour == 0 && ldt.minute == 0) "" else ldt.format(TIME_FMT)
-        date to time
+        EventWhen(ldt.format(DAY_FMT), ldt.format(MONTH_FMT), time)
     } catch (_: Exception) {
-        datetime.take(10) to ""
+        EventWhen(datetime.take(10), "", "")
     }
 }