implement APIs for LLS observation

ElementX/Sources/Services/Location/LiveLocationShareProxy.swift

@@ -0,0 +1,29 @@
+//
+// Copyright 2026 Element Creations Ltd.
+//
+// SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial.
+// Please see LICENSE files in the repository root for full details.
+//
+
+import Foundation
+import MatrixRustSDK
+
+struct LiveLocationShareProxy: Hashable {
+    let userID: String
+    let geoURI: GeoURI?
+    let timestamp: Date
+    let timeoutDate: Date
+}
+
+extension LiveLocationShareProxy {
+    init(liveLocationShare: LiveLocationShare) {
+        userID = liveLocationShare.userId
+        if let geoURI = liveLocationShare.lastLocation?.location.geoUri {
+            self.geoURI = GeoURI(string: geoURI)
+        } else {
+            geoURI = nil
+        }
+        timestamp = Date(timeIntervalSince1970: Double(liveLocationShare.startTs))
+        timeoutDate = timestamp.addingTimeInterval(Double(liveLocationShare.timeout) / 1000)
+    }
+}