feat: IAMs now display when triggers added before first fetch

- Addresses issue where in-app messages wouldn't display on cold starts if their triggers were added very early (before IAM fetch completed).
- Tracks triggers added before first fetch completes, then applies the isTriggerChanged flag to matching messages when they are received from the server, ensuring redisplay logic works correctly.

Author: nan-li

iOS_SDK/OneSignalSDK/OneSignalInAppMessages/Controller/OSMessagingController.m

@@ -149,6 +149,12 @@ @interface OSMessagingController ()
 /// set when we attempt getInAppMessagesFromServer and no onesignal ID is available yet
 @property (strong, nonatomic, nullable) NSString *shouldFetchOnUserChangeWithSubscriptionID;
 
+/// Tracks whether the first IAM fetch has completed since this cold start
+@property (nonatomic) BOOL hasCompletedFirstFetch;
+
+/// Tracks trigger keys added early on cold start (before first fetch completes), for redisplay logic
+@property (strong, nonatomic, nonnull) NSMutableSet<NSString *> *earlySessionTriggers;
+
 @end
 
 @implementation OSMessagingController
@@ -218,6 +224,8 @@ - (instancetype)init {
         self.messageDisplayQueue = [NSMutableArray new];
         self.clickListeners = [NSMutableArray new];
         self.lifecycleListeners = [NSMutableArray new];
+        self.hasCompletedFirstFetch = NO;
+        self.earlySessionTriggers = [NSMutableSet new];
 
         let standardUserDefaults = OneSignalUserDefaults.initStandard;
 
@@ -404,6 +412,23 @@ - (void)updateInAppMessagesFromServer:(NSArray<OSInAppMessageInternal *> *)newMe
     self.messages = newMessages;
     self.calledLoadTags = NO;
     [self resetRedisplayMessagesBySession];
+
+    // Apply isTriggerChanged for messages that match triggers added too early on cold start
+    if (self.earlySessionTriggers.count > 0) {
+        [OneSignalLog onesignalLog:ONE_S_LL_VERBOSE message:[NSString stringWithFormat:@"Processing triggers added early on cold start: %@", self.earlySessionTriggers]];
+        for (OSInAppMessageInternal *message in self.messages) {
+            if ([self.redisplayedInAppMessages objectForKey:message.messageId] &&
+                [self.triggerController hasSharedTriggers:message newTriggersKeys:self.earlySessionTriggers.allObjects]) {
+                [OneSignalLog onesignalLog:ONE_S_LL_VERBOSE message:[NSString stringWithFormat:@"Setting isTriggerChanged=YES for message %@", message]];
+                message.isTriggerChanged = YES;
+            }
+        }
+        [self.earlySessionTriggers removeAllObjects];
+    }
+
+    // Mark that first fetch has completed
+    self.hasCompletedFirstFetch = YES;
+
     [self evaluateMessages];
     [self deleteOldRedisplayedInAppMessages];
 }
@@ -806,6 +831,13 @@ - (void)evaluateRedisplayedInAppMessages:(NSArray<NSString *> *)newTriggersKeys
 #pragma mark Trigger Methods
 - (void)addTriggers:(NSDictionary<NSString *, id> *)triggers {
     [self evaluateRedisplayedInAppMessages:triggers.allKeys];
+
+    // Track triggers added early on cold start (before first fetch completes) for redisplay logic
+    if (!self.hasCompletedFirstFetch) {
+        [OneSignalLog onesignalLog:ONE_S_LL_VERBOSE message:[NSString stringWithFormat:@"Tracking triggers added early on cold start: %@", triggers]];
+        [self.earlySessionTriggers addObjectsFromArray:triggers.allKeys];
+    }
+
     [self.triggerController addTriggers:triggers];
 }