fix(domain): handle missing serverTime in Spotify ServerTimeResponse

app/src/main/java/pl/lambada/songsync/data/remote/lyrics_providers/spotify/SpotifyAPI.kt

@@ -106,13 +106,22 @@ class SpotifyAPI {
      * @return The server time in milliseconds.
      */
     private suspend fun getServerTime(): Long {
-        val response = client.get(
-            webPlayerURL + "api/server-time"
-        ) {
-            reqHeaders.forEach { (key, value) -> header(key, value) }
+        return try {
+            val response = client.get(
+                webPlayerURL + "api/server-time"
+            ) {
+                reqHeaders.forEach { (key, value) -> header(key, value) }
+            }
+            val body = response.bodyAsText(Charsets.UTF_8)
+            val serverTimeSeconds = json.decodeFromString<ServerTimeResponse>(body).serverTime
+
+            // If serverTime is 0 (default) or missing, fallback to system time.
+            // Spotify returns seconds, so we multiply by 1000. System time is already millis.
+            if (serverTimeSeconds > 0) serverTimeSeconds * 1000 else System.currentTimeMillis()
+        } catch (e: Exception) {
+            // Fallback to local time if request fails completely
+            System.currentTimeMillis()
         }
-        val body = response.bodyAsText(Charsets.UTF_8)
-        return json.decodeFromString<ServerTimeResponse>(body).serverTime * 1000
     }
 
     /**
@@ -211,4 +220,4 @@ class SpotifyAPI {
            albumArtURL
         )
     }
-}
+}

app/src/main/java/pl/lambada/songsync/domain/model/lyrics_providers/spotify/WebPlayerToken.kt

@@ -4,7 +4,7 @@ import kotlinx.serialization.Serializable
 
 @Serializable
 data class ServerTimeResponse(
-    val serverTime: Long,
+    val serverTime: Long = 0,
 )
 
 @Serializable
@@ -13,4 +13,4 @@ data class WebPlayerTokenResponse(
     val accessToken: String,
     val accessTokenExpirationTimestampMs: Long,
     val isAnonymous: Boolean,
-)
+)