M7: polish + E2E + docs (layout pass, theming, states, e2e driver, schema, setup.md, security)

app/shared/src/jvmMain/kotlin/iris/util/TimeFormatJvm.kt

@@ -0,0 +1,27 @@
+package iris.util
+
+import java.time.Instant
+import java.time.ZoneId
+import java.time.format.DateTimeFormatter
+import java.util.Locale
+
+// jvmMain is the intermediate source set for both androidMain (minSdk 29,
+// java.time available) and desktopMain, so one actual covers both targets.
+
+actual fun formatDayLabel(epochMillis: Long): String {
+    if (epochMillis <= 0) return ""
+    val zone = ZoneId.systemDefault()
+    val date = Instant.ofEpochMilli(epochMillis).atZone(zone)
+    val now = Instant.now().atZone(zone)
+    val pattern = if (date.year == now.year) "d. MMMM" else "d. MMMM, yyyy"
+    return DateTimeFormatter.ofPattern(pattern, Locale.getDefault()).format(date)
+}
+
+actual fun formatTime(epochMillis: Long): String {
+    if (epochMillis <= 0) return ""
+    return DateTimeFormatter.ofPattern("HH:mm", Locale.getDefault())
+        .format(Instant.ofEpochMilli(epochMillis).atZone(ZoneId.systemDefault()))
+}
+
+actual fun localDayKey(epochMillis: Long): String =
+    Instant.ofEpochMilli(epochMillis).atZone(ZoneId.systemDefault()).toLocalDate().toString()