chore: add snackbar message after pinging course participants (#3995)

lib/l10n/intl_en.arb

@@ -5246,5 +5246,6 @@
   "inviteFriendsToCourse": "Invite friends to my course",
   "subscribeToUnlockActivitySummaries": "Subscribe to unlock activity summaries",
   "subscribeToUnlockDefinitions": "Subscribe to unlock definitions",
-  "subscribeToUnlockTranscriptions": "Subscribe to unlock transcriptions"
+  "subscribeToUnlockTranscriptions": "Subscribe to unlock transcriptions",
+  "pingSent": "🔔 Course ping sent! 🔔"
 }

lib/pangea/activity_sessions/activity_session_start/activity_session_start_page.dart

@@ -332,7 +332,18 @@ class ActivitySessionStartController extends State<ActivitySessionStartPage> {
       },
     );
 
-    if (mounted) setState(() {});
+    if (mounted) {
+      setState(() {});
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(
+          content: Text(
+            L10n.of(context).pingSent,
+            textAlign: TextAlign.center,
+          ),
+          duration: const Duration(milliseconds: 2000),
+        ),
+      );
+    }
   }
 
   Future<void> playWithBot() async {

lib/pangea/payload_client/payload_client.dart

@@ -125,7 +125,7 @@ class PayloadClient {
         '$basePath/$collection${queryParams.isNotEmpty ? '?${queryStringify(queryParams)}' : ''}';
     final response = await get(endpoint);
 
-    if (response.statusCode != 200) {
+    if (response.statusCode >= 400) {
       throw Exception(
         'Failed to load documents: ${response.statusCode} ${response.body}',
       );
@@ -144,6 +144,11 @@ class PayloadClient {
   ) async {
     final endpoint = '$basePath/$collection/$id';
     final response = await get(endpoint);
+    if (response.statusCode >= 400) {
+      throw Exception(
+        'Failed to load document: ${response.statusCode} ${response.body}',
+      );
+    }
     final json = jsonDecode(response.body) as Map<String, dynamic>;
     return fromJson(json);
   }
@@ -156,6 +161,13 @@ class PayloadClient {
   ) async {
     final endpoint = '$basePath/$collection';
     final response = await post(endpoint, data);
+
+    if (response.statusCode >= 400) {
+      throw Exception(
+        'Failed to create document: ${response.statusCode} ${response.body}',
+      );
+    }
+
     final json = jsonDecode(response.body) as Map<String, dynamic>;
     return fromJson(json);
   }
@@ -169,6 +181,11 @@ class PayloadClient {
   ) async {
     final endpoint = '$basePath/$collection/$id';
     final response = await patch(endpoint, data);
+    if (response.statusCode >= 400) {
+      throw Exception(
+        'Failed to update document: ${response.statusCode} ${response.body}',
+      );
+    }
     final json = jsonDecode(response.body) as Map<String, dynamic>;
     return fromJson(json);
   }
@@ -181,6 +198,11 @@ class PayloadClient {
   ) async {
     final endpoint = '$basePath/$collection/$id';
     final response = await delete(endpoint);
+    if (response.statusCode >= 400) {
+      throw Exception(
+        'Failed to delete document: ${response.statusCode} ${response.body}',
+      );
+    }
     final json = jsonDecode(response.body) as Map<String, dynamic>;
     return fromJson(json);
   }