Add cross-device timer sync via WebDAV

When a sleep or breastfeeding timer is started, an "ongoing" event is
immediately saved to the logbook and synced via WebDAV. Other devices
detect this event on sync and can display/stop the timer. This allows
partners to stop timers started on another device.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/src/main/java/it/danieleverducci/lunatracker/entities/LunaEvent.kt

@@ -31,6 +31,20 @@ class LunaEvent: Comparable<LunaEvent> {
         const val TYPE_PUKE = "PUKE"
         const val TYPE_BATH = "BATH"
         const val TYPE_SLEEP = "SLEEP"
+
+        val BREASTFEEDING_TYPES = listOf(
+            TYPE_BREASTFEEDING_LEFT_NIPPLE,
+            TYPE_BREASTFEEDING_BOTH_NIPPLE,
+            TYPE_BREASTFEEDING_RIGHT_NIPPLE
+        )
+
+        fun findOngoing(events: List<LunaEvent>, type: String): LunaEvent? {
+            return events.firstOrNull { it.ongoing && it.type == type }
+        }
+
+        fun findOngoingBreastfeeding(events: List<LunaEvent>): LunaEvent? {
+            return events.firstOrNull { it.ongoing && it.type in BREASTFEEDING_TYPES }
+        }
     }
 
     private val jo: JSONObject
@@ -62,6 +76,14 @@ class LunaEvent: Comparable<LunaEvent> {
             if (value.isNotEmpty())
                 jo.put("signature", value)
         }
+    var ongoing: Boolean
+        get() = jo.optInt("ongoing", 0) == 1
+        set(value) {
+            if (value)
+                jo.put("ongoing", 1)
+            else
+                jo.remove("ongoing")
+        }
 
     constructor(jo: JSONObject) {
         this.jo = jo
@@ -138,6 +160,16 @@ class LunaEvent: Comparable<LunaEvent> {
         }
     }
 
+    fun finalizeOngoing(endTimeMillis: Long) {
+        if (!ongoing) return
+        val startTimeSeconds = this.time
+        val endTimeSeconds = endTimeMillis / 1000
+        val durationMinutes = Math.max(1, ((endTimeSeconds - startTimeSeconds) / 60).toInt())
+        this.time = endTimeSeconds
+        this.quantity = durationMinutes
+        this.ongoing = false
+    }
+
     fun toJson(): JSONObject {
         return jo
     }