refactor(data): modernize Firebase Tasks to .await() (safe subset)

Replace verbose suspendCancellableCoroutine{ cont -> task.addOnSuccessListener
{cont.resume}.addOnFailureListener{cont.resumeWithException} } wrappers with the
kotlinx-coroutines-play-services .await() extension in the files whose blocks are
all one-shot Tasks (no snapshot listeners / transactions to endanger):
FirestoreOutcomeDataSource, FirestoreCoupleDataSource, PlayIntegrityChecker.

Notably fixes FirestoreOutcomeDataSource, which mixed both styles in one file.
PlayIntegrityChecker.verifyWithServer keeps its failure→null semantics via
runCatching{ ... .await() }.getOrNull() (a bare await would throw instead).

The remaining ~11 data sources also use the callback pattern but mix in
callbackFlow snapshot listeners / transactions, so they need per-block review —
tracked in Future.md rather than bulk-rewritten on untested I/O.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

app/src/main/java/app/closer/data/remote/FirestoreCoupleDataSource.kt

@@ -8,12 +8,9 @@ import com.google.firebase.firestore.DocumentSnapshot
 import com.google.firebase.firestore.FirebaseFirestore
 import com.google.firebase.firestore.SetOptions
 import com.google.firebase.functions.FirebaseFunctions
-import kotlinx.coroutines.suspendCancellableCoroutine
 import kotlinx.coroutines.tasks.await
 import javax.inject.Inject
 import javax.inject.Singleton
-import kotlin.coroutines.resume
-import kotlin.coroutines.resumeWithException
 
 @Singleton
 class FirestoreCoupleDataSource @Inject constructor(
@@ -45,7 +42,7 @@ class FirestoreCoupleDataSource @Inject constructor(
         inviteCode: String,
         now: Long,
         wrappedKey: RecoveryKeyManager.WrappedKey
-    ): Unit = suspendCancellableCoroutine { cont ->
+    ) {
         val data = mutableMapOf<String, Any>(
             "id" to coupleId,
             "userIds" to listOf(inviterUserId, acceptorUserId),
@@ -57,13 +54,10 @@ class FirestoreCoupleDataSource @Inject constructor(
         data["wrappedCoupleKey"] = wrappedKey.cipherB64
         data["kdfSalt"] = wrappedKey.saltB64
         data["kdfParams"] = wrappedKey.params
-        coupleRef(coupleId).set(data)
-            .addOnSuccessListener { cont.resume(Unit) }
-            .addOnFailureListener { cont.resumeWithException(it) }
+        coupleRef(coupleId).set(data).await()
     }
 
-    suspend fun updateWrappedKey(coupleId: String, wrappedKey: RecoveryKeyManager.WrappedKey): Unit =
-        suspendCancellableCoroutine { cont ->
+    suspend fun updateWrappedKey(coupleId: String, wrappedKey: RecoveryKeyManager.WrappedKey) {
         coupleRef(coupleId).set(
             mapOf(
                 "wrappedCoupleKey" to wrappedKey.cipherB64,
@@ -71,37 +65,20 @@ class FirestoreCoupleDataSource @Inject constructor(
                 "kdfParams" to wrappedKey.params
             ),
             SetOptions.merge()
-            )
-                .addOnSuccessListener { cont.resume(Unit) }
-                .addOnFailureListener { cont.resumeWithException(it) }
+        ).await()
     }
 
-    private suspend fun updateUserCoupleId(uid: String, coupleId: String): Unit =
-        suspendCancellableCoroutine { cont ->
-            userRef(uid).set(
-                mapOf("coupleId" to coupleId),
-                SetOptions.merge()
-            )
-                .addOnSuccessListener { cont.resume(Unit) }
-                .addOnFailureListener { cont.resumeWithException(it) }
+    private suspend fun updateUserCoupleId(uid: String, coupleId: String) {
+        userRef(uid).set(mapOf("coupleId" to coupleId), SetOptions.merge()).await()
     }
 
-    suspend fun getCoupleById(coupleId: String): Couple? =
-        suspendCancellableCoroutine { cont ->
-            coupleRef(coupleId).get()
-                .addOnSuccessListener { snap ->
-                    if (!snap.exists()) { cont.resume(null); return@addOnSuccessListener }
-                    cont.resume(snap.toCouple())
-                }
-                .addOnFailureListener { cont.resumeWithException(it) }
+    suspend fun getCoupleById(coupleId: String): Couple? {
+        val snap = coupleRef(coupleId).get().await()
+        return if (snap.exists()) snap.toCouple() else null
     }
 
     suspend fun updateStreak(coupleId: String) {
-        val snap = suspendCancellableCoroutine<DocumentSnapshot> { cont ->
-            coupleRef(coupleId).get()
-                .addOnSuccessListener { cont.resume(it) }
-                .addOnFailureListener { cont.resumeWithException(it) }
-        }
+        val snap = coupleRef(coupleId).get().await()
         val lastAnsweredAt = snap.millisOrNull("lastAnsweredAt") ?: 0L
         val now = System.currentTimeMillis()
         val current = (snap.getLong("streakCount") ?: 0L).toInt()
@@ -114,14 +91,10 @@ class FirestoreCoupleDataSource @Inject constructor(
         )
         // Same-day answer → nothing to change; skip the redundant write.
         if (!next.changed) return
-        suspendCancellableCoroutine<Unit> { cont ->
         coupleRef(coupleId).set(
             mapOf("streakCount" to next.newStreak, "lastAnsweredAt" to now),
             SetOptions.merge()
-            )
-                .addOnSuccessListener { cont.resume(Unit) }
-                .addOnFailureListener { cont.resumeWithException(it) }
-        }
+        ).await()
     }
 
     suspend fun leaveCouple() {

app/src/main/java/app/closer/data/remote/FirestoreOutcomeDataSource.kt

@@ -8,12 +8,9 @@ import com.google.firebase.firestore.DocumentSnapshot
 import com.google.firebase.firestore.FieldPath
 import com.google.firebase.firestore.FirebaseFirestore
 import com.google.firebase.functions.FirebaseFunctions
-import kotlinx.coroutines.suspendCancellableCoroutine
 import kotlinx.coroutines.tasks.await
 import javax.inject.Inject
 import javax.inject.Singleton
-import kotlin.coroutines.resume
-import kotlin.coroutines.resumeWithException
 
 @Singleton
 class FirestoreOutcomeDataSource @Inject constructor(
@@ -25,8 +22,7 @@ class FirestoreOutcomeDataSource @Inject constructor(
         val OUTCOME_DAY_KEYS: List<OutcomeDayKey> = OutcomeDay.entries.map { it.key }
     }
 
-    suspend fun submitOutcome(coupleId: String, dayKey: OutcomeDayKey, scores: OutcomeScores): Unit =
-        suspendCancellableCoroutine { cont ->
+    suspend fun submitOutcome(coupleId: String, dayKey: OutcomeDayKey, scores: OutcomeScores) {
         functions.getHttpsCallable("submitOutcomeCallable")
             .call(
                 mapOf(
@@ -35,18 +31,12 @@ class FirestoreOutcomeDataSource @Inject constructor(
                     "scores" to scores.toMap()
                 )
             )
-                .addOnSuccessListener { cont.resume(Unit) }
-                .addOnFailureListener { cont.resumeWithException(it) }
+            .await()
     }
 
-    suspend fun getOutcome(coupleId: String, dayKey: OutcomeDayKey): Outcome? =
-        suspendCancellableCoroutine { cont ->
-            outcomeRef(coupleId, dayKey)
-                .get()
-                .addOnSuccessListener { snap ->
-                    cont.resume(if (snap.exists()) snap.toOutcome() else null)
-                }
-                .addOnFailureListener { cont.resumeWithException(it) }
+    suspend fun getOutcome(coupleId: String, dayKey: OutcomeDayKey): Outcome? {
+        val snap = outcomeRef(coupleId, dayKey).get().await()
+        return if (snap.exists()) snap.toOutcome() else null
     }
 
     suspend fun getOutcomes(coupleId: String): List<Outcome> {

app/src/main/java/app/closer/data/security/PlayIntegrityChecker.kt

@@ -12,12 +12,10 @@ import dagger.hilt.android.qualifiers.ApplicationContext
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asStateFlow
-import kotlinx.coroutines.suspendCancellableCoroutine
+import kotlinx.coroutines.tasks.await
 import java.util.UUID
 import javax.inject.Inject
 import javax.inject.Singleton
-import kotlin.coroutines.resume
-import kotlin.coroutines.resumeWithException
 
 /**
  * Checks device integrity using the Play Integrity API.
@@ -73,31 +71,27 @@ class PlayIntegrityChecker @Inject constructor(
         }
     }
 
-    private suspend fun requestToken(): String = suspendCancellableCoroutine { cont ->
+    private suspend fun requestToken(): String {
         val nonce = Base64.encodeToString(
             "${UUID.randomUUID()}-${System.currentTimeMillis()}".toByteArray(Charsets.UTF_8),
             Base64.URL_SAFE or Base64.NO_WRAP,
         )
-        IntegrityManagerFactory.create(context)
+        return IntegrityManagerFactory.create(context)
             .requestIntegrityToken(IntegrityTokenRequest.builder().setNonce(nonce).build())
-            .addOnSuccessListener { cont.resume(it.token()) }
-            .addOnFailureListener { cont.resumeWithException(it) }
+            .await()
+            .token()
     }
 
-    /** Returns the server verdict, or null when verification couldn't be completed. */
-    private suspend fun verifyWithServer(token: String): Boolean? =
-        suspendCancellableCoroutine { cont ->
-            functions
+    /**
+     * Returns the server verdict, or null when verification couldn't be completed. A failure
+     * (server/network) maps to null — NOT an exception — so we don't assert PASSED; Firebase App
+     * Check remains the server-side gatekeeper. (Hence runCatching rather than a bare await.)
+     */
+    private suspend fun verifyWithServer(token: String): Boolean? = runCatching {
+        val result = functions
             .getHttpsCallable("checkDeviceIntegrity")
             .call(mapOf("token" to token))
-                .addOnSuccessListener { result ->
-                    val passed = (result.getData() as? Map<*, *>)?.get("passed") as? Boolean
-                    cont.resume(passed) // null if the server returned no explicit verdict
-                }
-                .addOnFailureListener {
-                    // Couldn't verify (server/network). Don't assert PASSED — surface as
-                    // UNAVAILABLE. Firebase App Check remains the server-side gatekeeper.
-                    cont.resume(null)
-                }
-        }
+            .await()
+        (result.getData() as? Map<*, *>)?.get("passed") as? Boolean
+    }.getOrNull()
 }