Add "minutes ago" time formatting

Introduces a `minutesAgo` helper function and uses it in `CaseStoreStub`
to populate `CaseEntry` objects with relative timestamps for recent
activities. Also updates `formatTime` in `CaseListScreen` to display
"Gerade eben", "Vor 1 Minute", or "Vor X Minuten" for entries younger
than an hour. This provides a more user-friendly display for recent
cases.

watch/wearos/app/src/main/java/com/doctate/watch/domain/CaseStoreStub.kt

@@ -78,17 +78,20 @@ object CaseStoreStub {
         val today = LocalDate.now(zone)
         fun at(date: LocalDate, hour: Int, minute: Int): Long =
             date.atTime(hour, minute).atZone(zone).toInstant().toEpochMilli()
+        fun minutesAgo(m: Long): Long = now - m * 60_000L
 
-        // Ordered newest -> oldest to satisfy the `lastActivityAt desc` invariant.
+        // Covers all label variants: "Vor 1 Minute" / "Vor X Minuten" / HH:mm /
-        // Covers all three date-label variants: today (HH:mm), yesterday (Gestern - HH:mm), older (dd.MM.yy - HH:mm).
+        // "Gestern - HH:mm" / "dd.MM.yy - HH:mm". `sortedByDescending` keeps the
-        val recent = now - 20 * 60_000L
+        // store invariant (newest first) intact regardless of the current time of day.
-        _cases.value = listOf(
+        val entries = listOf(
-            CaseEntry(CaseId.new(), recent, recent, "Kniegelenksarthroskopie rechts"),
+            CaseEntry(CaseId.new(), minutesAgo(1), minutesAgo(1), "Anamnese Herr Weber"),
+            CaseEntry(CaseId.new(), minutesAgo(32), minutesAgo(32), "Kniegelenksarthroskopie rechts"),
             CaseEntry(CaseId.new(), at(today, 8, 15), at(today, 8, 15), "Befund Thorax unauffällig"),
             CaseEntry(CaseId.new(), at(today.minusDays(1), 16, 40), at(today.minusDays(1), 16, 40), "Postoperative Visite Zimmer 12"),
             CaseEntry(CaseId.new(), at(today.minusDays(3), 11, 20), at(today.minusDays(3), 11, 20), "MRT Schulter links"),
             CaseEntry(CaseId.new(), at(today.minusDays(8), 9, 5), at(today.minusDays(8), 9, 5), "Laborkontrolle Diabetes"),
         )
+        _cases.value = entries.sortedByDescending { it.lastActivityAt }
         requestTileRefresh("seedDemoData")
     }
 

watch/wearos/app/src/main/java/com/doctate/watch/presentation/CaseListScreen.kt

@@ -128,6 +128,14 @@ private val timeFormat = DateTimeFormatter.ofPattern("HH:mm", Locale.getDefault(
 private val dateTimeFormat = DateTimeFormatter.ofPattern("dd.MM.yy - HH:mm", Locale.getDefault())
 
 private fun formatTime(epochMs: Long): String {
+    val ageMinutes = (System.currentTimeMillis() - epochMs) / 60_000L
+    if (ageMinutes in 0L until 60L) {
+        return when (ageMinutes) {
+            0L -> "Gerade eben"
+            1L -> "Vor 1 Minute"
+            else -> "Vor $ageMinutes Minuten"
+        }
+    }
     val zone = ZoneId.systemDefault()
     val created = Instant.ofEpochMilli(epochMs).atZone(zone)
     val createdDate = created.toLocalDate()