Add team roles and content management updates

Backend/Endpoints/AdminNominationModerationEndpoints.cs

@@ -26,9 +26,7 @@ public static partial class AdminModerationEndpoints
             return Results.NotFound();
         }
 
-        var rawDisplayName = string.IsNullOrWhiteSpace(request.DisplayName)
-            ? nomination.CandidateText
-            : request.DisplayName.Trim();
+        var rawDisplayName = request.DisplayName?.Trim() ?? string.Empty;
 
         if (string.IsNullOrWhiteSpace(rawDisplayName))
         {
@@ -37,11 +35,19 @@ public static partial class AdminModerationEndpoints
 
         var channelSlug = request.ChannelSlug?.Trim() ?? string.Empty;
         var platform = string.IsNullOrWhiteSpace(request.Platform) ? "Twitch" : request.Platform.Trim();
+        var normalizedDisplayName = rawDisplayName.ToLower();
+        var normalizedChannelSlug = channelSlug.ToLower();
+        var normalizedPlatform = platform.ToLower();
 
         var existingCandidate = await db.Candidates.FirstOrDefaultAsync(item =>
             item.SeasonId == nomination.SeasonId
             && item.CategoryId == nomination.CategoryId
-            && item.DisplayName.ToLower() == rawDisplayName.ToLower());
+            && (
+                item.DisplayName.ToLower() == normalizedDisplayName
+                || (!string.IsNullOrWhiteSpace(normalizedChannelSlug)
+                    && item.ChannelSlug.ToLower() == normalizedChannelSlug
+                    && item.Platform.ToLower() == normalizedPlatform)
+            ));
 
         var candidate = existingCandidate;
         if (candidate is null)
@@ -60,6 +66,8 @@ public static partial class AdminModerationEndpoints
         }
         else
         {
+            candidate.DisplayName = rawDisplayName;
+
             if (!string.IsNullOrWhiteSpace(channelSlug))
             {
                 candidate.ChannelSlug = channelSlug;